PC lockup, suspected psu/not enough power

HI, I am working on my friends PC he started having freezing/lockup issues with windows 7(64) and errors in event manager showed that amd/ati errors. He also got a over heating light on his video card, vapor-x-HD4870 2G GDDR5 PCIE. So Cleaned it out removed / reinstalled the drivers and tested it again, still locked up.

His setup

ASUS M4A77TD Pro AM3 AMD 770 ATX AMD Motherboard
SAPPHIRE Vapor-X Radeon HD 4870 2GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card
Antec EarthWatts EA750 750W Continuous Power ATX12V version 2.3 SLI Certified CrossFire Ready 80 PLUS Certified Active PFC "compatible with Core i7/Core i5" Power Supply
AMD Phenom II X4 955 Black Edition Deneb 3.2GHz Socket AM3 125W Quad-Core Processor HDZ955FBGIBOX
PNY Optima 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model MD4096KD3-1333
Rosewill RCR-IC001 40-in-1 USB 2.0 3.5" Internal Card Reader w/ USB Port / Extra Silver Face Plate
LG DVD Burner Black SATA Model GH22NS50 - OEM
HITACHI 0A38016 1TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive

So, I put my 4870 in his pc and did a burn in test and no crashes or lockup. So Has to be the video card correct? so we order one

New card XFX HD-697A-CNFC Radeon HD 6970 2GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity

I install, powers up once then after then the PC comes on the video card fan you can hear goes up and down and the pc never comes fully on again.
I unplug all none needed items like fans, dvd drives and try again. I get it to boot did burn in test passed with no issues, did a few start up and shutdowns, no issues.
But he takes it home and it plays for 2 hours, next day turns on surfs the web locks up.

My thoughs is the PSU is not putting enough power out for that video card.

Antec EarthWatts EA750 750W Continuous Power ATX12V version 2.3 SLI Certified CrossFire Ready 80 PLUS Certified Active PFC "compatible with Core i7/Core i5" Power Supply

So we are thinking of getting a 850w psu, any thoughts? Or suggestions thank full
5 answers Last reply Best Answer
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  1. Best answer
    Since you tested your video card in his computer can't you test you psu in it as well? It does sound like it is the psu and if you don't want to test yours in his Pc then he's going to get a new psu to go along with his new video card. Before too long he will have a new computer. If he needs a new psu I doubt that he needs a 850w and you could get a new 750w and have enough power. Here is a link to a power supply calculator;

    Also you can get a good psu;
    SeaSonic M12II 750 SS-750AM 750W ATX12V / EPS12V SLI Ready 80 PLUS BRONZE Certified Modular Active PFC Semi-modular Power Supply
  2. I didn't test my psu with his video card because my psu is only 650 w and lower then what his is
  3. Why would that matter? It's still more than enough to run his computer.

    You only need 550 watts to run a single HD 6970. That Antec 750w power supply would be plenty to run 2 x HD6970s in Crossfire.

    What exactly is a "burn in test"? Is this an older system or a new build? Have you run memtest to rule out bad RAM?
  4. Best answer selected by vmasia.
  5. sorry for the late reply, the PSU was not providing enough power, and the video card was locking up. Not sure what damaged them both, but replaced both them and works perfectly.

    Thanks for the help.

    Burn in is a program that runs the cpu, gpu, audio, network, memory all at once to look for hardware issues.
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