Overclocking 6850 question

[bombfirst885]

Is it safe/smart to turn the settings all the way up in Overdrive (minus fan)? First time overclocking.

 

[Spectrum]

No. Increase the core speed slightly then test and keep doing that over and over, until you see artifacts. When you see artifacts, decrease by 5mhz or so.

Also be careful with that card, the barts GPU doesn't seem to OC well.. (At least the one on my card doesn't) Really You'd need something like MSI afterburner to OC your card well, because with that you can control the voltage too.

 

[Wrigleyvillain]

He is right but I bet it does 850/1150 (the CCC limit) just fine on stock volts esp if you up the fan speed. I'm at 950/1200 1.185v at this point via Trixx. Read that's about the sweet spot with these anyway in terms of diminishing returns. Mine'll do 1000+ with more juice just really not worth it except for benching.

 

[bombfirst885]

No. Increase the core speed slightly then test and keep doing that over and over, until you see artifacts. When you see artifacts, decrease by 5mhz or so.

Also be careful with that card, the barts GPU doesn't seem to OC well.. (At least the one on my card doesn't) Really You'd need something like MSI afterburner to OC your card well, because with that you can control the voltage too.

Is there a program I should be testing with?

 

[micropage7]

use 3dmark
start it by 10% first then push little by little. dont be greed. test again until its really stable. and theres no limitation on oc it depends on your hardware setting and so

 

[Spectrum]

micropage is right, unigine heaven and 3dmark are both good.

 

[Wrigleyvillain]

For simple and quick heat/artifact testing I would use Furmark or Kombustor (pretty much same thing). Then the tests mentioned above and/or any of the 3DMark releases at your usual gaming res for further stability testing. 06 is very CPU heavy though. Can't beat actually gaming too but play something a crash wouldn't be too much of a bummer. If its multi you know you're gonna be doing great when it decides to take a dump.

 

[bombfirst885]

How long should I be running the Furmark stability test before I consider it stable?

 

[Wrigleyvillain]

I'd say a half hour is more than enough. And you are not just looking for it to not crash but also checking for any graphical wierdness known as "artifacts". If you see artifacts it's clocked too high for present voltage and/or overheating.

 

[HossHuge]

You can also do some research first. Check reviews of your HD6850 and see how its O/Ced for them. This could give you a ballpark figure.

 

[Wrigleyvillain]

950 seems to be about the sweet spot for these things and mine do it fine with around 1.19v

 

[COPI]

why can't i adjust the voltage of my gigabyte HD6850 OC edition with MSIAfterburner210Beta7 ??
who can solve it

 

[HossHuge]

why can't i adjust the voltage of my gigabyte HD6850 OC edition with MSIAfterburner210Beta7 ??
who can solve it

Because the O/C model doesn't have voltage control.

From Benchmark Reviews

You know what's better? The non-OC version of this specific model with Windforce 2x cooler costs $10 less, and it has full support for voltage control, which means it might be able to achieve 900MHz or possibly more thanks to the included cooler. In other words, GIGABYTE made the overclocked version a non-overclockable one, while it keeps the non-overclocked version quite overclockable for the masses with the proper software. What a joke!

http://benchmarkreviews.com/index.p...k=view&id=678&Itemid=72&limit=1&limitstart=12

 

[fi011]

Overclocking HD6850

Hi guys, i could need a word of advise. I have Sapphire 6850, X6 1055t OCed on 3.7 GHz, 4GB ddr3 ram, and Titan 212 + cooler. I unlocked the card using MSI afterburner (unofficialoverclocking 1), and got core voltage to 1265, core clock 1002, memory clock on 1216, and I got significant improvement in games (about 20% in crysis 2, 30 % in dragon age 2)...
My question is following: can I put fan speed on auto (about 30 %), because when I put it on 100 % the fan sound is really loud... Temperature with 100 % fan never esceeded 73 C. But when I put it on auto, my system freezed when playin video on you tube ... Do u think I over overclock it? Is fan on auto causing instability?
fi011 is offline Reply With Quote

 

[Kast]

On my 6850's I found the sweet spot to be 925/1125. After that the performance increases were very minimal. All cards are different the best thing you can do is your own testing to find what settings fit you and your card. I was never able to hit 1000 on the core and I've read about other people doing it so just trial and error with stability test and you get where you want to be.