HD6850 Overclocking

paradisiac · 29 Jan 2011 at 09:22

ok, so i have had a bit of a play and have managed to run a few benchmarks with the core clock up at 945MHz and no other settings touched, but it was not 100% stable (MSI Kombustor failed stability after a few mins). seems to be ok with core clock on 900MHz though.
have i hit the wall due to the voltage? if so whats safe increases? also, why in afterburner is the shadow clock not available, is this a setting i have missed or does the card not support it? is there any gains to be had trying to increase the cards ram clock?

welshdragon · 29 Jan 2011 at 09:25

I couldn't get mine past 900 wihtout then hitting the voltage mate. If I remember 900/1100 was the limit at stock vaults.

paradisiac · 29 Jan 2011 at 09:30

welshdragon said:
I couldn't get mine past 900 wihtout then hitting the voltage mate. If I remember 900/1100 was the limit at stock vaults.

ok kool, did you up your volts?

paradisiac · 29 Jan 2011 at 10:13

managed to get it to 920/1100 and kombustor rand for 15mins ok.

welshdragon · 29 Jan 2011 at 10:30

yes after that I upped the volts. managed 1000/1250 on volts of 1.225 I think it was, but everycard is different.

Have a look at this for some discussion:#

http://www.anandtech.com/Show/Index...eon-hd-6850-overclocking-roundup-asus-xfx-msi

Also, I did another 6850 thread a few weeks back, it ahs other forum members' results of whats actually achievable.

paradisiac · 29 Jan 2011 at 10:32

i have started getting blocks appearing on screen after 20mins, is this ram/core set too high or could it be either?

welshdragon · 29 Jan 2011 at 10:35

could be either, could also be a lack of voltage are you upping the voltage? What is it set to when the blocks appear? ie clocks/voltage/temps?

It may also be that you've foudn the limit of your card.

paradisiac · 29 Jan 2011 at 10:41

voltage hasnt been change, so it starts on 900/1100 (although i just bumped the ram straight up). although reading your thread, other than benchmarking the gains dont seem worth it in gaming, or did i miss understand?

paradisiac · 29 Jan 2011 at 11:54

put it back to stock and played need for speed hot pursuit and fifa 11 on max settings (1920x1080) and both run smooth as, so will leave it at stock for now

LiamJ · 29 Jan 2011 at 12:46

Pushed mine straight up to 900/1100 easily on stock volts and perfectly stable. It will go further, but it's being bottlenecked at the moment anyway, so there's no need.

paradisiac · 29 Jan 2011 at 12:49

LiamJ said:
Pushed mine straight up to 900/1100 easily on stock volts and perfectly stable. It will go further, but it's being bottlenecked at the moment anyway, so there's no need.

what have you done to assume its stable?

LiamJ · 5 Feb 2011 at 13:49

About half an hour on MSI Kombustor did the trick.

I have recently increased the clock to 975/1100 on 1.2V, which is also perfectly stable. It will go further, I am sure.

welshdragon · 5 Feb 2011 at 22:55

From my own experience and benched oc's online on the reviews, 950/1100 on 1.2 would appear the sweet spot for this card as temps etc are still ok. I've also managed 1000/1200 with a larger vcore bump though.