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[Official] AMD Radeon HD 6850/6870 Owners Thread - Page 367

post #3661 of 6939
Quote:
Originally Posted by padzki View Post
Thanks for your help!! another question: should i put the fan on auto or fixed?? should i run the benchmark presets on Furmark?
I would keep it set to auto, but set up the fan profile to what you want. When it's set on auto, the fan will speed up when the card gets hotter. That way you only have to deal with noise when the card needs the extra cooling from higher fan speed. That said, the default fan profile is usually terrible. The lazy option is to make it a straight line 1% fan to 1C temp. But if you really want to tweak it to what you want, you still have the option. Unfortunately, I use Afterburner, so I'm not sure how to set up a fan profile in Trixx.

And use the Stability Test on Furmark. It'll run as long as you let it, which is better than the benchmark which will run for a preset amount of time. The benchmark can be good, but I would just wait until the temperature flatlines.
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post #3662 of 6939
Hi i have the powercolor PCS+ HD6870, I have the accelero xtreme plus cooler on this card which i run at 100% using the 7v cable.
Either way since my highest recorded temperature was 55C with the new cooler in place (and it runs silent) I decided to try an overclock. Couldnt seem to get the permission to increase maximum in msi afterburner so I just bumpred it up to 1000mhz core clock with 1250mhz memory clock, didnt have to mess about with voltages and it ran fine, and then benchmarked using unigine heaven dx11 benchmark 2.5
I found a noticeable increase in fps from the 'stock' speeds (I say 'stock' because the PCS+ comes pre-overclocked).
Since I didnt have to increase voltage temperatures stayed the same.
Now I'm wondering how much further I can take the 6870, what overclocks are others running?
Thanks
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post #3663 of 6939
So I have my 6850's in xfire. Any specific way to OC them or can I just get afterburner and bump the volts to 1.25 per card and go for 1GHz/1250 Mem then run furmark for a few hours?

Also what's the max safe volts and temp for the Directcu 6850? Currently I dont break 54C on full load with either card in xfire with 20C ambient.
post #3664 of 6939
Quote:
Originally Posted by Davitz View Post
So I have my 6850's in xfire. Any specific way to OC them or can I just get afterburner and bump the volts to 1.25 per card and go for 1GHz/1250 Mem then run furmark for a few hours?

Also what's the max safe volts and temp for the Directcu 6850? Currently I dont break 54C on full load with either card in xfire with 20C ambient.
If you got lucky with the cards that might work.but more likely you have to go a little at a time until it gets unstable and add a little voltage.one of my cards is stable at 1030 the other wont go past 930 for more than a hour.
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post #3665 of 6939
Quote:
Originally Posted by Point Blank Rob View Post
Hi i have the powercolor PCS+ HD6870, I have the accelero xtreme plus cooler on this card which i run at 100% using the 7v cable.
Either way since my highest recorded temperature was 55C with the new cooler in place (and it runs silent) I decided to try an overclock. Couldnt seem to get the permission to increase maximum in msi afterburner so I just bumpred it up to 1000mhz core clock with 1250mhz memory clock, didnt have to mess about with voltages and it ran fine, and then benchmarked using unigine heaven dx11 benchmark 2.5
I found a noticeable increase in fps from the 'stock' speeds (I say 'stock' because the PCS+ comes pre-overclocked).
Since I didnt have to increase voltage temperatures stayed the same.
Now I'm wondering how much further I can take the 6870, what overclocks are others running?
Thanks
Thanks
Quote:
Originally Posted by Davitz View Post
So I have my 6850's in xfire. Any specific way to OC them or can I just get afterburner and bump the volts to 1.25 per card and go for 1GHz/1250 Mem then run furmark for a few hours?

Also what's the max safe volts and temp for the Directcu 6850? Currently I dont break 54C on full load with either card in xfire with 20C ambient.
80C is what most people comfort zone is. They're rated higher but to be safe, stay below 80.

To see what people overclocks at, check out the database at HWBot and get familiar with the different search filters. http://hwbot.org/init.results.search.do
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post #3666 of 6939
Well what I could do is disable crossfire, make sure I switch off PCI-E slot 3 and OC to 1GHz or instability whichever comes first for the first card and then shut down, disable PCI-E slot 1 and enable slot 3 and just OC them one at a time?

Or should I slowly bump them both up together at the same time say 50MHz per pass on furmark? In that case, how long should I run furmark per pass?
post #3667 of 6939
Quote:
Originally Posted by Davitz View Post
Well what I could do is disable crossfire, make sure I switch off PCI-E slot 3 and OC to 1GHz or instability whichever comes first for the first card and then shut down, disable PCI-E slot 1 and enable slot 3 and just OC them one at a time?

Or should I slowly bump them both up together at the same time say 50MHz per pass on furmark? In that case, how long should I run furmark per pass?
One at a time takes longer but is better.for example I run my first (top) card at 1000 and the second at 930 when in xfire they both run at 930 but some games like nba2k11 automaticly disable xfire so my main card is running at 1000.

don't bother with short runs of furmark because if it fails in a short run its no where near stable. its much easier and more fun to just play a demanding game.my drivers fail in shift 2 or crysis 2 (at high settings) way faster than furmark.If temps are not an issue furmark will run a long time without artifacts at unstable clocks.
Edited by smoke420 - 5/17/11 at 11:53am
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post #3668 of 6939
So how long should the passes with furmark be?
post #3669 of 6939
can the owners of 6850 share their fan profiles in afterburner and some tips on how to set it correctly?

just wana be sure that i am setting them correctly for max. cooling as my asus eah 6850s temps reach 80C on load that too w/o oc!!
though my ambients are high(around 35C)

heres mine, i have tried to get an exponential curve as i read in one of the guide in on ocn

Edited by abu46 - 5/17/11 at 8:55pm
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post #3670 of 6939
Just got finished adding my Dual Gigabyte 6850's into my Water Cooling Loop using XSPC RASA Universal Blocks. The results are spectacular(950/1250 @1.2v). With the stock cooling I couldn't get this high. I was able to run OCCT for 1hr with no errors on max shaders @ 1080p and maxed out a 52oC. Easily 20-30oC cooler.
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