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nownicked
Pilgrim
Joined: 14 Apr 2012
Posts: 18
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 Posted: Tue Apr 17, 2012 2:36 pm Post subject: |
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| AIDA only seems to show hard drive temps, cpu temps and gpu temps. The heatsink which is under the gpus, has a fan which blows over it, using the included fan bracket with the haf x, meaning that the gpu's and that heatsink have extra cooling. I would hope that its not overheating, but it doesnt seem that I have a temperature for anywhere on the motherboard. |
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bdub
Black Belt 3rd Degree
Joined: 19 Feb 2003
Posts: 3330
Location: Washington D.C.
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| Posted: Tue Apr 17, 2012 7:47 pm Post subject: |
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how many sensors do you show in the bios? there should be a health monitor page or something like that.
there's a free program called speedfan which may show you more sensor within the OS, if there are any.
if we can't nail the shut-offs to some type of heat problem, then i'd have to say it is time to think about switching out the psu.
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nownicked
Pilgrim
Joined: 14 Apr 2012
Posts: 18
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| Posted: Tue Apr 17, 2012 11:43 pm Post subject: |
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I have a cathode ray oscilloscope, does anyone know if i could use it to check if the power out of the PSU is clean?  , i dont want to break it haha.. |
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evasive
Mobo-fu Master
Joined: 06 May 2001
Posts: 36385
Location: Netherlands, Breda
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| Posted: Wed Apr 18, 2012 1:26 am Post subject: |
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As long as you set the input range to something safe (e.g. 20V full scale) it should be fine.
If you have one that can work with DC offset you're in business, it means you can set the measuring range quite small and get a clearer view on the noise/ripple.
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nownicked
Pilgrim
Joined: 14 Apr 2012
Posts: 18
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| Posted: Wed Apr 18, 2012 1:39 am Post subject: |
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Which power cable and pins within that cable from the PSU should I use?
From what I can see the power supply has 6 rails + i guess it should be tested under load, how would you recommend doing this? |
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evasive
Mobo-fu Master
Joined: 06 May 2001
Posts: 36385
Location: Netherlands, Breda
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| Posted: Wed Apr 18, 2012 3:25 am Post subject: |
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If you look on top of the power plug you can see the metal, if you can somehow connect your probe to that, it should be fine.
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Karlsweldt
Enlightened Master
Joined: 12 Nov 2003
Posts: 18574
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| Posted: Wed Apr 18, 2012 8:25 am Post subject: |
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The heaviest current draw would be on the +3.3 volts and +5 volts sources.
Measuring ripple on a PSU is not hard.. as long as the 'scope is calibrated properly, and grounding to avoid interference (external EMF, RFI) is proper.
Use the black lead(s) at the PSU main power connector as a common, not a ground point or other lead to different devices.
It is near impossible to avoid any ripple in DC power, unless triple-filter setups are used, a 50 mV level is considered "good". Fluctuations in system power needs can create 'spikes' that are detrimental also.
Strong electromagnetic fields from nearby power transformers or industrial equipment can induce ripple to properly filtered DC circuits.
Check these reference links:
http://www.amperordirect.com/pc/r-power-resource/z-reference-ripple-testing.html
http://www.amperordirect.com/pc/r-power-resource/z-reference-power_ripple_issue.html
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Mr T
Enlightened Master
Joined: 14 Jun 2002
Posts: 16642
Location: England
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| Posted: Wed Apr 18, 2012 11:31 am Post subject: |
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Is it a modular PSU..? If you can swap the PSU out with a known working one.. If the PSU is the culprit, it should be a warranty job....
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nownicked
Pilgrim
Joined: 14 Apr 2012
Posts: 18
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| Posted: Wed Apr 18, 2012 7:32 pm Post subject: |
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Ok thanks, it is a modular PSU, but I do not have a spare.
It is an Enermax Max Revo 1200Watt PSU, the only thing that I was wondering about, is that It seems to have 6, 30Amp rails for 12volts, the cables which are used for the GPUs (6 pin and 8pin) are both put into the same port on the actual power supply, as the cable from the power supply changes into two 6+2 cables. Some people are saying that 580's draw about 38 amps or more...
could I be putting too much pressure on some rails or will multiple rails assist in powering each GPU? |
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Mr T
Enlightened Master
Joined: 14 Jun 2002
Posts: 16642
Location: England
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| Posted: Wed Apr 18, 2012 8:10 pm Post subject: |
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If you can, split the GPU connectors onto separate ports...
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