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Author Topic: Power Supply Question  (Read 3003 times)
Bert
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June 16, 2011, 07:50:08 PM
 #21

Try to keep the temperature under 85 °C. After that ...

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Bert
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June 16, 2011, 07:53:03 PM
 #22

Maybe this - http://www.xtremesystems.org/forums/showthread.php?271848-How-to-shut-off-computer-based-on-GPU-temp&p=4871671&viewfull=1#post4871671

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stu8
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June 17, 2011, 10:05:59 AM
 #23

blew up my cheap PSU Wink ...

will the

Corsair CMPSU-750TXV2
(750, bronze, +12V 62A, +3,3V 30A, +5V 30A, +5Vsb 3A, -12V 0,8A)
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139021&Tpk=CMPSU-750TXV2

be fine with 2x 5850 + 140 sempron etc. ?
Bert
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June 17, 2011, 10:11:51 AM
 #24

What is your motherboard, CPU, RAM, HDD, anything else plugged into the machine USB devices (HDD,fans,???) ?

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June 17, 2011, 10:19:51 AM
 #25

Asus M4A79T Deluxe 790FX AM3 ATX
AMD Sempron 140 1x 2.70GHz
2GB (1x 2048MB) Kingston ValueRAM DDR3-1333
250GB Samsung Spinpoint F3 HD253GJ 7.200
USB Wlan Stick
2x 120mm Fans
Zxian
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June 17, 2011, 10:54:13 AM
 #26

Actually, Bert has the concept of efficiency and power ratings backwards. A 500W PSU should be able to supply 500W of sustained DC load. If it has a 80% efficiency at full load, it will be drawing 625W AC.

All of this is what the power supplies should be able to handle. The sad truth is that many PSU manufacturers tend to overstate their actual power capabilities or simply don't stress test their units properly.

That all being said, you don't want to be running your PSU at it's full capacity all the time anyways. It'd be like redlining your car continuously and expecting it to work after 3 months.

The 750TX should be able to handle the two 5850's you have with some headroom to spare. I'd check the actual power draw using a Kill-a-watt, and then estimate or look up the efficiency to determine the DC draw on the PSU. A safe estimate would be that between 30-70% load, the PSU would be 80% efficient. Otherwise, count for 75%.

The only two websites that I really trust for PSU recommendations are SilentPCReview and Jonny Guru. Both have the methodology to properly test power supplies to their full capability. (I'm a little biased in this regard since I used to work for SPCR).

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