5850 HD crashes/reboots after 30-45 minutes

[bitcon]

i have a 5850 HD card and i can mine for about 30-45 minutes before my computer crashes. my PSU is 650watts. the card requires 2x 6pin power plugs which i am running 1 from the PSU and another is an adapter from two 4-pin molex connectors because the PSU doesnt have 2 6pin plugs that the card requires. the card gets up to about 88 degrees celcius also. sometimes when i fire up my rig i get a long beep then 3 short beeps; which is GPU error, but if i hit the reset switch it will boot up just fine and i can mine for 30-45 minutes before it crashes again.  does this sound like a PSU problem or a problem with the card itself?

[Aztec]

It might be overheating. Try with the case open or msiAfterburner to control the fan

[bitcon]

yea, case is open, will try msiAfterburner

[bitcon]

gpu temp is fine about 60 c, but still crashing at about 45 minutes... only thing i can think is PSU not supplying enough power or defective card

[LivesUnderTheBridge]

You OC it? Try hooking the molex up to a different connector.

Is it on an otherwise stable system?

[bitcon]

system
is stable with any other card... will msiAfterburner tell me if it has been OC'ed? just bought the card used.

[Aztec]

MSI Afterburner will tell you the values for voltage, clock and memory speeds so you can compare to what the default settings should be

[bitcon]

yea, looks like the previous card owner had OC'ed it. i reset it to defaults and she's running stable now.  thanks.

[Aztec]

yea, looks like the previous card owner had OC'ed it. i reset it to defaults and she's running stable now.  thanks.

no problem glad to help Try just knocking the clock up by increments of 5 and see where it gets you before it crashes. I used the AMD overclock tool to change my clock to 900 and mem to 300 and it is quite stable. I run msiafterburner in the background just to control fan speed. If I go beyond 900 clock, it's prone to crash