problem cause : power supply or motherboard

August 13, 2010 at 12:10:55
Specs: Windows 7
Dear all,
I encountered two video graphic cards damages , the first one worked for two years , then got damaged , the other one worked for 5 or 6 months , then also got damaged (by damaged i mean blank or distorted screen and BSODs).Now, i am suspicious , is it a problem with a faulty power supply , or a faulty motherboard. I am also suspicious that it might be the electricity changes or the overheating as i live in a hot weather country.
what do you think is the problem ?. What part should i change , or how to test these parts ?

the first video card was a 7300 GT 265MB
the second video card was a 8400 GS 512MB

Thanks for any help

See More: problem cause : power supply or motherboard

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August 13, 2010 at 12:37:17
Check the output voltages on all the rails of the PSU by checking in the BIOS screens. Maybe listed as PC health?

The voltages should be at least within 10% +- of the rated voltage. Preferably 5%.
IE: +12V x 90% = 10.8V. - 12V x 110% = 13.2V
12V x 95% = 11.4V - 12V x 105% = 12.6V

Graphics cards are vulnerable to overheating when stressed.

PC health will also show temperatures.

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August 14, 2010 at 04:47:48
Dear Sir,
Thank u for reply
I checked the PC health with the damaged VGA (It works but will hang and give artifacts if any OS windows or linux starts), it gives in the PC health the following values

Processor fan speed 2520

rear fan speed 2100

processor temp 77 C
internal 53 C
remote 48 C

V12.0 = 11.9875 V
V5.0 5.084
V3.3 3.303
V1.5 1.542
Vccp 1.242

they are constantly changing , but within a fraction range
does that mean that my power supply is ok ?

if it is ,should i just buy a third video card ? , what is the precautions so that this new one doesn't get damaged like the other two ?


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August 14, 2010 at 05:08:25
Those numbers appear to be OK.

Graphic cards are actually like two cards in one. The first, the one you used to view PC Health, is a generic VGA display. Once the operating system starts and loads then the full featured, accelerated, version kicks in. That portion of your card is probably damaged.

You have identified the most likely cause of the damage. Overheating.

What size case do you have? mini, mid, full tower? Does you case have a rear case fan?

Do you keep your computer case in a computer desk, or any type of confined area?

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August 14, 2010 at 05:29:46
well , i have a full tower case , and i always keep one side open because i know that the weather here is hot .it does have a rear fan ,but the fan level is above the VGA card level so it's only cooling one side of it , i think i can hook another fan somewhere else , and i'll get a VGA that has a fan on top of it , so that i guarantee that this never happens again.

Thanks a lot for your help

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August 14, 2010 at 05:36:17
Keeping the side cover off doesn't allow for proper cooling of all parts of the computer. You should instead have a large (120mm) rear discharge case fan installed. The case usually has space at the lower front where air can be pulled in. If the case has a decent design, the air should pass over most components in the case on the way to the upper rear discharge fan. You may be able to monitor the GPU temperatures to see that your graphics card is running too hot.

Do the cards you mention have their own cooling fans?

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August 14, 2010 at 07:28:58
Neither of the old cards had any cooling fans , they just had some fins . The cover has a place to mount an extra fan , which i am going to buy , plus the newer cards have cooling fans . And yes i have a discharge fan in the case.

thank you for the help

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