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HD4850 - overclocking issue

P

Psychor

Limp Gawd
Joined
Dec 22, 2007
Messages
388
Threw in one of my two HD4850s tonight and ran a battery of tests while at stock (3DMark Vantage, FurMark, Lightsmark, etc.). I then cranked the card up to 700/1000 and re-ran the tests. No problems. Later I got adventurous and cranked the memory up to 1100 which was a bit too high (e.g., driver crash then black screen while running FurMark). A reboot got me back into Vista but for some reason I can't seem to get back to 700/1000 without having the driver crash (e.g., while running FurMark). I'm not sure why a previously stable clock would now be so unstable.

Any ideas why this would be? Could I have damaged the card somehow or missed a setting in CCC?

Thanks.
 
running GDDR above it's stable frequencies actually damages it. You just hurt your ram.
 
Sojuuk said:
running GDDR above it's stable frequencies actually damages it. You just hurt your ram.
Click to expand...

x2
What he said. Just like with the 45nm intel cpus, running them above certain voltage limits over time burns them and limits your oc. Sorry man.
 
DeadSkull said:
x2
What he said. Just like with the 45nm intel cpus, running them above certain voltage limits over time burns them and limits your oc. Sorry man.
Click to expand...

I didn't touch the voltage values. Stock the memory is at 993. 1100 is far from extreme. I appreciate the input though.
 
Psychor said:
I didn't touch the voltage values. Stock the memory is at 993. 1100 is far from extreme. I appreciate the input though.
Click to expand...

all it takes is 1 chip being slightly poor and getting hurt to kill you overclocking :(
 
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