New system - Silencing - Plan & Testing

[ Index ] - of Computer Noise Report

Overview - Trying to structure chaos :)

Status :

> 05.MAR 2001 : Started building a new silent PSU.
> 02.MAR.2001 : System 2 destroyed by lightning. The "Tranquilzer" PSU(4) chocked on an overdose of electricity.
> 27 FEB.2001 : Attempting to minimize HD access. Tuning.
> 26.FEB.2001 : Testing the standard element(3) for refrence. Installed more memory. New peak PSU temp.
> 25.FEB.2001 : System totally silent. Fanless CPU Element(4) OK. Minimising HD uptime remains.
> 20.FEB.2001 : System nearly silent. PSU testing OK. Mounting & testing of fanless CPU element(4)remains.

Table of content : Bookmarks

< Fill in info >

Testing :

The "Tranquilizer" PSU(4)

The "Doomsday" CPU Element(4)

Observations :

Power consumption measurments of system(2)

Planned steps : Excecution & Followup

1. CPU fan related issues.

1.1 Reducing fan operation from 12V to 3V by installing noise-killer (fan-regulator).

Q : Will this cancel the monitoring abilities of the MB ?
A : Yes. Fan reported as off in monitor. This is probably due to the lower voltage, counting may start again at a higher temperature and voltage level. Junk info for now anyway.

• Comment on results when fan operated @ 6.0 Volts :
  This step greatly reduced the noise-level from the CPU fan, particularly the whiny sounds,.to a more comfortable level.
  Temperature measurements : CPU(26/29C) depending on load. Ambient temperature 21.9 C. Cabinet (33.0 C). HDD (41.0 C). All this is with maximum power-load (except CPU). Having problems with shutting down the HD with the new MB.
  Noise level measurements : From standard listening position the measurements were : 29 dBA and 34 dBC. At the front of the cabinet I measured the noise-levels to be : 31.7 dBA and 40.2 dBC. This is livable levels.
• Comment on results when fan operated @ 3.77 Volts :
  After messing about with the noise-killer(1) a futher reduction in output voltage was made possible by altering the input voltage to the regulator from +12 V to +7 V. This disabled any effect of the thermistor input, but no tears as it's a total flop as a dynamic regulator anyway. A brief report where made from the case study of the noise-killer/fan-regulator(1). [ noise-killer(1) findings ]
  Noise level measurements : The noise-levels where measured for the fan when operated at 12 V and at the new level of 3.77 V. Sound preassure level where 1 cm from top of fan, centered on rotation-axis. Wind-cap on. Readings for 12 V operation where 68 dBA and 70 dBC. When operated at 3.77 V the noise-level was measured to 40 dBA and 50 dBC, a great improvement from the default levels. From standard listening position, readings is now : 29.1 dBA and 37.6 dBC (?). Front measures : 31.7 dBA and 42.2 dBC.(?)
  Temperature measurements : CPU temperatur level has naturally increased somewhat, and idle temperature is now 28 C. That is 2 degrees higher than when fan was operated at 6 Volts, temperature also peaks higher and quicker under load. Reaches 45 C quickly when disabling software-cooling, do load-testing later. ( Shouldn't exceed 50 C). No change in other temperatures.
  Temperature Testing : Disabling software-cooler, temperature after 15 min. is 56.5 C. Based on previous experience this is about 95 % or peak temperature. Excepted temperature is then approx. 60 C. Temperature drops very quickly when enabling software cooler again. 10 degrees in less than a minute. Oh ... by the way cabinet temperature was unchanged at 34 C, but PSU(3) geared down to meet the load. Very very good regulation of fan.

1.2 Improve stability of MB under CPU socket base.

Serious vibrations resonating throughout the entire chassis. Done this before. Doing it at this early point may increase the life-time of fan. Using vibration-dampening & shock-absorbing material underneath the MB.

This was effective. Added a spots of shock absorbing rubber at stategic positions on the MB. Very well.

1.3 Improve stability of cooling rib on CPU.

Adding "shims" of some sort between rib and processor. This will eliminate some of the "wobbling" of the fan. As it is it's like balancing a helicopter at the top of a flag-pole. The "shims" should be of some non-conductive, and possibly heat-isolating material. ( I'm not sure whether it is a point to insulate all but the cpu-die from the rib by air, but assume that the creators of the chip and rib (boxed-type) knows what they're doing ).

From what I've seen it appears that this is called "spacers", and is supposed to "improve" heat conduction and ribb stability. I'm not shure about the value of the heat conductions stuff, but improving stability is a point particularly with the celeron FC-PGA pacaging. The custom made cooler exceeds the weight specs. for the ribb by miles, and something has to be done.

1.3.1 Made one copper-spacer.

Quite time consuming. Hope that it works. [Testing/Fitting/Picture]
Nope ... didn't fit. Too thick. Skip for now. Not worth the effort.

1.3.2 Made alternative element support.

A heat tolerant shock absorbing rubber foam stuff where used instead. Easy to make. Very usefull for fitting the element on the die without getting the "twists".

2. Cooldown. Decrease Vcore & Vio voltage of CPU.

Since the CPU clock-speed is derived from the FSB speed, it is not possible to clock down the Celeron  processor. The only way is up. For a P3 however it would be possible to clock down from 133 MHz and all the way down to 66 MHz. How large a factor the CPU speed is in heat generation I do not know, but migh look at this at a later stage. Possibly when my system becomes to slow, but as of now there is plenty of power.

The initial system set-up was as described in latter parts of section 1.1. Recap : CPU Fan regulated down to 3.77 Volts, apprx. 28 C CPU idle temperature.

2.1 Decreasing Vcore from 1.7 to 1.5 volts :

CPU idle temperautre falls to 26.5 C, also observed lower peak temperatures under load. System appears stable. (not tested).

* Specify the difference, what was the temperature before. Peak measurments.

2.2 Decreasing Vcore from 1.5 to 1.4 volts :

CPU idle temperautre drops to 25.5 C. Lowerd peak temperatures under load. 29.5 C @ 25% Load. Quick stability test (using CPUStability test 6.0) holds for 15 minutes without any problems. Peak temperature more than 10 C lower than at standard settings.

* Specify the difference. Idle/Load measurments.

What effect does SWC or ACPI have ? Dissable and check ... Pops up 5 C  instantly ... The SWC makes a difference of about 19 C in CPU idle temperature. Huge difference.

2.3 Decreasing Vcore from 1.4 to 1.3 volts :

Can't recall this. Think temperature where sniffing at 24 C, but the impression is that system was unstable. Redo another time.

Update : System failed to boot ( Note ! Vio set to 3.4 volts in BIOS, but boots at 3.5 volts )

Q: What is the effect of decreasing the Vcore voltage on CPU temperature. ? [2.x] Any ?

A: Great effect in lowering both idle- and peak CPU temperatures.

2.4 Decreasing Vio from 3.5 V (default) to 3.3 V (stable at 3.4 V ) :

For some strange reason the default setting for the Vio voltage on the MB is set to 3.5 Volts. Changed this setting on a hunch. The effect seemed to be a slight drop in CPU tempeature when measured without SWC. (From 44.5 C to 43.0 C).

The +3.3 Volts low-limit in the Winbond HW Doc monitor program was also changed to reflect the new setting. Changed from +3.39 V to 3.20 V.

Got some problems with the high-point controller poping up despite beeing disabled in BIOS. Had to increase the Vio to 3.4 to make the problem go away. Hummm ... Strange stuff. Don't know the standard setting.

2.5 Decreasing Vcore from 1.4 to 1.35 :

System appears to be stable. Temperatures lower. Typical idle temperatures @ 21.9 ambient : CPU 25.5 C, MB 27.5 C. Quick test of Load temperatures @ same ambient : CPU 41.5 C & MB 28.0 C. Measurements done 25 min. after dissabeling SWC. Slightly lowered temp.

3. Creation of custom cooling rib system for PC-FGA type CPU.

3.1 New ideas. The CuCo Tube.

Idea temporarily parked. Reality testing didn't workout as well as wished.

3.2 The "Doomsday" cooling element.

Work in progress : Copper-spacer complete. Will try to test the first custom cooler element to get an indication of the required dimentions of the new element. Skipped this, made the element on feeling. But test the first element anyway so that the difference in effectiveness can be measured.

3.2.1 Testing of the first fanless cooling original element, Q4 Element(2) :

Follow up in seperate file, or bookmark within this document. [ Q4 presentation ]

3.3 Limited overclocking testing.

See how far up system is stable with minmal Vcore and Vio settings. Do this with minimal settings first. Do the extreemes later. Followup in seperate file, or bookmark.

4. PSU issues.

After the burn-in test of psu(2), move it into the current system. Temperature testing with or without vent.fan. under different loads.

Gather sample data using mb-monitor of the operation of the current psu(3), and compare this with the results for psu(2).
There where no time for this. From memory. Typical values from before cabinett modification, and before inserting the fanless PSU(2), where :

• MB temperature : 32 C
• HD (noise-box) : 39 C
• CPU : 25.5 (minimum), 1.4 Vcore, Cooler Fan at 3.77 Volts.

The maximum values ever recorded are :

• MB temperature : 36 C, Original Cabinet
• HD (noise-box) : 43 C
• CPU : 57 C @ 1.7 Vcore, Cooler Fan at 3.77 Volts, Load testing : No ACPI or SWC.

4.1 The PSU(2) where inserted into the cabinett and tested.

There where no major differences in monitored voltages between PSU(2) and PSU(3).

1. Stable PSU temperature with cabinett cover off, psu shield off and idle system : 45 C @ 19.7 C ambient.
2. Stable PSU temperature with cabinett cover on, psu shield off and idle system : 56 C @ 22.3 C ambient.
3. Stable PSU temperature with cabinett cover on, psu shield on and idle system : 58 C @ 21.5 C ambient.
4. Stable PSU temperature with cabinett cover off, psu shield on and loaded system : 62 C @ 22.4 C ambient.
5. Stable PSU temperature with cabinett cover on, psu shield on and loaded system : 65 C @ 22.4 C ambien

For more details : [testing psu(2/4) in system(2) report]    [  PSU(4) presentation ]

5. Cabinet Issues :

Airflow / ventilation.( Increased and altered cabinet perforation. Ventilation fan's ? Not needed.)
- The vent. holes in the side of the cabinett has to go. HF HDD noise comes out this way.

- Cabinett modified sucessfully. Extremely time consuming. Significance noticed in the testing of PSU(2) with system(1). With system(2) the effect is noticed by a more than 3 C drop in cabinett temperature. And that is the difference without cab.fan, versus with.

6. Fallback systems. Overheating security.

(Fan's & regulation of ... tuning of noise-killers)

oo - The ABit MB has a super safety feature in BIOS. This enables the system to automatically shut down at a critical temperature. The minimum setting are critical though, but functions like a MAIN fuse in case of disaster. Another draw-back is that this auto-shutdown feature only takes into account the CPU temperature. I'm more concerned about my HD information being fried, than some expendable processor. Now this problem might be solved with newer IBM drives, that have built in overtemperature protection. Seems like they've started to use the SMART information present in their drives :).

6.1 Making the stuff for psu(4). Built around the exsisting fan-regulatur of psu(2) :

Mess mess mess. Trouble trouble. But the idea seem to work, although there is a minor clash with reality. Takes 10 times longer to do that imagined.

7. Other

Monitor noise :

This problem solved itself as the 17" monitor(1) failed. And I got an 15" with a level that is lower than the machine noise. This problem also seems to disappear with time, as LCD monitors starts to become affordable.

Minimizing HD activity :

The only source of noise left in the system is that which is generated by the drives. The HD Noisebox dampens this to a decent level. After numerous modeficatons of the prototype, the hopes of getting a 0dB drive using this approach has been abandoned. More drastic measures are needed, and I don't really have the time or the energy to create one at the present.

To minimize the HD activity the windows vcache settings are optimized using the postcardware utillity "cacheman 3.70" by Thomas Reimann [ http://www.outertech.com ]

To futher minimize HD access, some experimentation with a ram drive was also tried. Using the RamDrive98 shareware tool [ http://www.jlajoie.com/ramdsk98 ]  to create a 64+ MB drive. On this drive the windows swap file for the virtual memory settings were placed. This had little or no effect on windows related disk access. Placing mp3 files on this drive worked great however.

OO - What is needed is a great windows disk cache utillity, optimized to minimize windows disk activity. I also note that most of the programs that I use manage to keep their fingers off the drive most of the time, but most of the MS stuff have to sniff at some "#¤"#¤ .dll or what do I know at every screen scroll. MS-Windows prooves the saying : Less is More. I just totally give up trying to eliminate win disk accress, it will take years off my life and tonns of pills to get by. I'll spend the energy on creating a customized software-independent zero-dB drive instead. I'll expect it will be much more rewarding than spending eternity re-booting windows :)

The HD powerdown setting where set at 1 min in BIOS. This is a bit too agressive when working with programs that is disk intensive, but fine with other programs. f.eks. fruity-loops.

The Virtual memory settings where disabled. Unceritain results. Have caused a unstable system in the past.

Conclusion : Optimized vcache settings. More memory. Aggressive HDD powerdown setting.

8. Defenitions

A bit late, and highly inaccurate ... and limited to the scope of this document.

Idle state. Load state. m.m.

Report : Testing PSU(2/4) in System(2)

After the testing on system(1) was sucessful, it was time for testing it with system(2). Note that the CPU fan is still on, as the custom cooler for the celeron is not ready yet. This will be done later. Also note that the PSU grid and blower-fan (just in case) has not been mounted in the testing below.

Minimal Testing :

Started out with a minimal setup to see if it would hold at all. No CD-RW/Floppy/Soundcard etc., only Video-card(2) and HD.  Open cabinett. ACPI/SWC on. CPU fan on.

The system booted up fine. And when the HD powered down, the room was filled with a strange; uncomfortable silence.

The PSU & system voltages was withing the range of PSU(3). Monitored using the Winbond HW Doctor program. The +12 V and +5 V voltages was slightly higher than before; around 0.1 Volts higher.

Tested for 3 hrs 45 min.(stable temp reached before this)

Conclusion : stable at 45 C @ 19.7 ambient (delta 0.0025 C/min) on idle with open cab.

Power doodling : see findings in table below (Power consumption)

Full scale testing :

After the minimal test was passed, all the normal stuff was plugged in. The PCI card was replaced with an AGP card. Soundcard added. CD-RW added. Cab.cover on. ACPI on. CPU fan on.

Testing started off from standby and a PSU temp of 27 C @ 20 C ambient.

Tested for + 8 hrs (stable temp reached before this)

[ Table of measurments to be added ]

Other related measurements :

• MB temperature : 28 C, Closed cabinet.
• HD (noise-box) : 36 C, Normal use
• CPU : 26.5 (minimum), 1.4 Vcore, Cooler Fan at 3.77 Volts. ACPI/APM. No SWC.

Conclusion : stable at 56.5 C @ 22.1 C ambient on idle with closed cab. ? Other temps at this state

Update #1 (08/02/01) : Measurments of PSU temperature another day with open cab.

Disabled the ACPI feature & swapped the AGP with the PCI card. Windows troble. Booting Booting. But anyway. After this heavy use psu temperature peaked at around 50 C @ 22.8 C ambient. That is with all of the equipment of the Full scale testing. Normalized this is about 2 C above the minimal testing result. This result is also more directly comparable with the full testing, and indicates that the difference between cab. cover or not is around 7 C. So there is still room for improvement.

Other related measurements :

• MB temperature : 25 C, Open Cabinet.
• HD (noise-box) : 36 C
• CPU : 21.5 (minimum), 1.4 Vcore, Cooler Fan at 3.77 Volts. No ACPI. Waterfall 1.23 SWC.

Update #2 (09/02/01) : Overnight testing of PSU temperature with closed cabinet.

The system was left idle overnight to find the stable idle temperature. Video and HD power down.

This gave the following measurements :

• PSU temperature : 52.8 C @ 22.1 C ambient.
• MB temperature : 28 C, Closed Cabinet.
• HD (noise-box) : 28 C
• CPU : 25.5 C @ 1.4 Vcore, Cooler Fan at 3.77 Volts. No ACPI. Waterfall 1.23 SWC.

Load Testing :

Diverse testing of system under load. See it is stable under extreme conditions. Disable SWC and use CPU Stabtest. This will be with done with fan on CPU. Do other testing later (different Vcore later, when custom cooler element (2) is ready).

Testing with SWC disabled successful. Readings when connected to the universe.

• PSU temperature : 59.1 C @ 22.7 C ambient. (delta < 0.07 C/m)
• MB temperature : 28 C, Closed Cabinet.
• HD (noise-box) : 38 C, No Powerdown, Medium use, New and Lower peak temperature.
• CPU : 44.5 C @ 1.4 Vcore, Cooler Fan at 3.77 Volts. No ACPI. No SWC.
• Missing info. mesurement of actual powerconsumption.

Testing with CPU Stab. Test V 6.0. CPU warming feature (maximized power-consumption).

No significant difference from the testing with SWC disabled. A 1.5 C increase in CPU temperature, and a 0.7 C increase in psu temp after 1 hour of testing. Seems like the function of the test program is to twist that last drop of power out of the system.Stable at any system load with this setup.

A snap shot of the open cab tempearature measures :

• PSU temperature : 49.7 C @ 22.6 C ambient, No shield
• MB temperature : 27 C, Open Cabinet. Vio 3.4.
• HD (in free air) : 35 C (measured at drive bottom). No Powerdown, Medium use, Outside Cab, Out of noise-box.
• CPU (matches amb.temp.) : 22.5 C @ 1.4 Vcore, Cooler Fan at 3.77 Volts. No ACPI. SWC on.

These measurments shows that cab. ventialtion is very good. Small differences with or without cab. cover.

Final Testing :

With psu shield and backup blower-fan/regulator on.

TEST 1 : Open Cab. Shield on. Load testing : Peak psu core temperature measurment

Prelude : The SWC have been disabled for a small hour ... starting measurments from there.

22:32    54.7 C @ 21.9 C

22:34    55.0   

22:45    56.4 C @ 22.0 C    Ohhh ... delta 0.15 C/min ... ETA ?

23:03    58.2 C @ 21.6 C    delta 0.10 C/min ... Guess 61.5 or 63 C in 1 to 2 hours.

23:17    58.8 C @ 21.8 C    delta 0.043 C/min

23:32    59.5 C @ 21.9 C    delta 0.046 C/min     conv. 20 min pr. C

23:44    59.8 C @ 22.0 C   

23:49    60.0 C @ 22.1 C    delta 0.4 C/min

00:45    61.4 C @ 22.3 C    delta 0.025 C/min v 40 min. pr C

01:30    62.0 C @ 22.4 C    delta 0.013 C/min v 75 min pr C

02:25    62.1 C @ 22.4 C    delta 0.0018 C/min v 550 min pr. C

02:37    62.2 C @ 22.4 C

02:42    62.3 C @ 22.2 C

02:45    62.4 C @ 22.2 C    ??? Wobbeleing a bit.

02:48    62.3 C @ 22.2 C

02:49    62.4 C @ 22.2 C

> Concludes stable : 62 C @ 22.4 C ambient open cab.

TEST 2 : Open Cab. Shield on. Idle testing : Peak psu core temperature measurment.

Leave overnight and let it cool down. HD and Video will power down. Lower than typical measurment values.

> Result.1 : ..... 56.4 C @ 20.6 C. ( HD has been kept on by a disk tool).

> Result.2: ..... 55.7 C @ 20.9 C HD Off. Very moisty air. Thick fogg outside.

TEST 3 : Closed Cab. Shield on Idle testing.

Kick-start.measurments ...

23:04    59.3 C @ 21.6 C    HD on (1 min PD setting) , Video on, 85/90 % idle on average.

00:04    60.5 C @ 22.0 C    Average 70 % Idle. delta 0.02 C/min v 50 min pr. C

Temporery conclusion : stable on idle at around 60 C @ 22 C : Validate overnight.

> Result 1 : 58.2 C @ 21.5 C    HD off (1 min PD), Video off, 100% idle.

Temperatures : MB (28) HD(28) CPU(26)

TEST 4 : Closed Cab. Shield on. Load testing.

Prelude : Kicks off from peak idle measurment. Test Limit 65 C

00:07    60.5 C @ 22.0 C    SWC disabled.

00:12    60.9 C                      rough delta 0.08 C/min v 12.5 min. pr. C

00:15    61.1 C

00:30    62.1 C @ 22.1 C    delta 0.066 C/min v 15 min/C

01:22    64.3 C @ 22.2 C    delta  0.042 C/min v 23.6 min/C

01:26    64.4 C @ 22.3 C    delta 0.025 C/min ... ETA 65.4 C

01:31    64.5 C @                 delta 0.020 C/min

02:57    64.8 C @ 22.4 C    delta 0.0034 C/min v 286 min/C.

03:01    64.9 C @ 22.5 C    =)(/=)(/ HD has for some reason powerd down. Peak not reached.

03:27    65.2 C @                  delta 0.012 C/min v 86 min/C

03:39    65.3 C @

03:51    65.3 C @

> Concludes : stable at 65 C @ 22.4 C ambient. Closed Cab. PSU shield on. :)

Zummary :

• PSU temperature : 65.3 C @ 22.5 C ambient room temperature. Shield on.
• MB temperature : 28.5 C, Closed Cabinet.
• HD (noise-box) : 34 C**, No Powerdown, HD Medium use, Sensor relocated, box-slightly modified.
• CPU : 44.5 C @ 1.4 Vcore, Cooler Fan at 3.77 Volts. No ACPI. No SWC.
• Missing info. mesurement of actual powerconsumption.

Comment on the anticipatet results : Expect an temperature increase of max 5 degrees C. Depending on how successful the modefication of shield perforation were. Lack measurments for comparing the Open Cab.Load state.

For the open-cab measurment : Seem to recall a open cab measurment of around 59 C,,,, what was this before ? There are no matching measurments. This can only be compared to an measurment of stable idle temperature measured with open cabinet. [ stable at 45 C @ 19.7 ambient (delta 0.0025 C/min) on idle with open cab.]

[ measures & results ]

Update of recorded maximal PSU tempearture :

In conjucntion with fanless testing of the standard CPU Element(3), a higher PSU core temperature was recorded. This was with different Vcore and Vio settings than above, and also with maximal cpu heat generation/powerconsumption.

Prelude : 2 Hours of maximal powerconsumption.

03:58     PSU 66.1 C @ 20.8 C ambient temperature
This is expected as the CPU warming tweaks those last drop of power out of the system.
04:01     PSU 66.2 C delta 0.0333 v 30 min pr. C
04:04     PSU 66.3 C -----
04:07     PSU 66.4 C -----
04:10     PSU 66.5 C @ 20.8 Ambient
04:12     PSU 66.6 C
04:17     PSU 66.7 C * off mark measure
04:19     PSU 66.8 C *
04:23     PSU 66.9 C delta slowing down ?
04:27     PSU 67.0 C
04:31     PSU 67.1 C
04:37     PSU 67.2 C delta 0.0166 v 60 min pr. C stable enough.
04:42     PSU 67.3 C delta 0.02, concludes : stable at around 68 C max. CPU load at 1.4 Vcore.
04:50     PSU 67.4 C delta 0.0125 v 80 min pr. C, rate of change falling off.

CPU Warming stops after 1 hour 10 min.

Measurment Zummary :

• PSU temperature : 67.4 C @ 20.9 C ambient room temperature. Shield on.
• MB temperature : 27 C, Closed Cabinet.
• HD (noise-box) : 32 C**, 1 min HD Powerdown, HD Medium use, Sensor relocated, box-slightly modified.
• CPU : 67.0 C @ 1.4 Vcore, 3.5 Vio, Disabled Cooler Fan, Standard Element(3) No ACPI. No SWC. Maximal CPU  heat generation.
• Missing info. mesurement of actual powerconsumption.

PSU stable around 67 C @ 20.8 Ambient tempearture. Maximal CPU power consumption at 1.4 Vcore and 3.5 Vio.
Learning : The powerconsumption of the system with software cooling disabled is not maximal, though very close. By using the CPU stab.test program's warming feature a higher powerconsumption can be achieved and higher tempartures can be found. These are no significantly higer, but gives an worst case indication.

Observations :

Arising from the testing of the PSU(2/4) in system(2) :

Power consumption measurments of system(2) :

Measurments are indirect, and individual values are based on the total effect used by the system at different states.

All values are approximate, and done using a high quality digital multimeter. Average measurments of steady states.

Measured wall socket voltage : 235 V (used in power consumption calculations)

PSU Netfilter consumes 7-8 mA even when powerswitch is off.

Standby power consumption 27-30 mA

Soundcard(1) draws 10 mA

HD(1) draws 5 mA when spinning idle, and 25 mA when awakening from power-down.

The CD-RW(1) uses 5 mA when idle (no spinning)

The PCI Video-card(2) uses 7 mA

The AGP Video-card(3) uses 10 mA

Total power consumption of system(2) with all components added (HD,CD-RW, SoundCard) and the new AGP videocard is 130 mA under normal use. i.e. everythings on, but fairly idle.

* Add measurments for peak- and minmal load.

[ Index ]