I have recently bought an ATI sapphire radeon 5850. my pc specs is: Core 2 Dou E6600 @ 2.4 GHZ 4 GB DDR @ 800 MHZ, motherboard is AWD-MAX 9D, Power Supply is HEX 520 Corshair, windows 7 32bit.
about a month after i bought my card ive noticed a problem that my PC freezes after some time ( wether im in a game like BF BC2 or DIRT 2 for example or wether im just surfing the internet. when it was freezing i wasnt able to turn my PC off from the button - only by pulling the cable out.
after changing the BIOS battery and 2 sticks of my RAM ( 2 x 1GB GSKILL ) i seemed to solve the problem of my pc freezing when im not playing any game, and the turning off the computer issue.
But then the PC keeps freezing when im playing a game.
ive noticed from time to time the tray icon shows a warning about "AMD drivers stopped working" - but thats in a good situatio, when normally the PC just freezes and i have to restart the computer.
i tried updating teh latest drivers from ATI website, but that didnt work aswell.
Freezing problems are often RAM related. Which exact RAM kit do you have? Have you manually set the RAM speed, timings, and voltage to their rated specs in the BIOS? Have you run Memtest86+ overnight to test for RAM errors? That's where I'd start. I doubt it's related to your 5850 or Windows 7.
The problem could also be related to your HEC PSU. If these problems just started when you got your 5850 it's possible the PSU can't put out enough clean power under load to properly power the 5850.
Your ram is rated to run at 800MHz with 5-5-5-18 timings at 1.9v. You should manually set those values in the BIOS and see if it fixes your freezing problem. If not, you should download Memtest86+ from www.memtest.org and burn the ISO image to a CD. You then boot your system from the CD and the RAM test starts automatically. You should let it run overnight. If it gets any errors then you should RMA your RAM.