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Sapphire 4850 OC Issue?

M

mdaniel

Limp Gawd
Joined
Jan 8, 2004
Messages
344
Greetings everyone!

I've had this card for about a month in the system that is in my sig. As long as I don't OC anything, I have no problems. However, when I try even a 10 Mhz bump to the core, the system crashes and locks up. I'm running dual monitors at 1440x900, and when the crash happens, each monitor has a different color version of vertical bars that are less than a .25 inch in width. Auto-Tune causes this same crash. Once the crash happens and I reboot, the system loads fine until the CCC tries to load. Once that happens, the same crash happens instantly. If I reboot under another user profile, then I don't experience the crash again until I log into my main profile.

The only way I can resolve it is to boot in safe mode and un-install all of the ATI software. Upon reloading all of the CCC and ATI drivers (8.12), the crash is gone. Unless I try to OC. OS is XP-Pro. Let me know what other info I might need to provide.

Any ideas?
 
I have the same problem on an Asus 4850, any change in the clock speed and it crashes in the same way. The card is plenty cool and I checked the bios and the oc limits are 800/1200 which means its not a clock limit causing the problem.
 
I think I might have found a fix: http://www.hardforum.com/showthread.php?t=1336696

I didn't load in a new bios, I just acquired mine, saved the original and then changed my memory speed to 1050 across the board (from 750 & 993). Stable thus far. I also changed all of the gpu speeds that were 625 to 640. I'll run auto-tune now to see if it crashes like before.

UPDATE #1:

Well, running auto-tun caused it to crash at 690 gpu and 1095 ram. Same green vertical bars. I've since changed it back to 640 & 1050...which is the modified BIOS defaults and it"seems" ok once again. I'm no expert, but based upon all of my research, it appears to be a dual display issue when matched with ATI Overdrive. It "Seems" stable as long as I do the OC through the BIOS and ignore ATI Overdrive. Time for some FO3 to see if it holds.

UPDATE #2:

Well, other than the normal bug / lag / exploding textures in certain areas of FO3, I did not experience any crashes at all with the BIOS OCd to 640 & 1050. I'll have keep my fingers crossed.
 
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