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Help overclocking a 6870

post #1 of 9
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Hi

Is it safe to push a cards memory and core clock to its limit (without artefacts) if you dont increase the voltage?

Any general advice on ocing a gpu?

Thanks
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post #2 of 9
my sapphire will do 1000 on the core without a voltage increase. overclocking without a voltage increase will be safer than with a voltage increase. just keep an eye on the cards temps. i wouldn't expect to see much performance gains ocing it though...maybe alittle ,but not worth the time imo.
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post #3 of 9
Trial and error is the only way to find out. Set it to 1000Mhz core. If you can't complete a 3DMark11 bench test then bump it 0.025mV until you get stable.

Once you can complete a bench test, give your most demanding game a try. Nothing better than a stability test than a couple of hours of gaming.

If you should black screen during gaming, then bump another 0.025mV. Give it another go and see.

I don't see why your couldn't. Some cards don't over clock as well as others from same series/vendor. It's luck of the draw really.

IF you don't feel comfortable with voltage bumps, then start at 950Mhz. Bench test, and if it passes go up another 15Mhz core clock at a time until you get unstable again. Then back down one notch and you'll know your cards ceiling.

Good luck and post back to let us know how it went and how you did. smile.gif
     
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post #4 of 9
There isn't much headroom on the HD 6870's due to already high factory clocks, but you will probably hit 900-950 with no voltage adjustment, and over 1GHZ on air with some extra juice. That is just an average of what I have been seeing thus far with barts, and your actual chip will vary.
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post #5 of 9
mine can do 1000 core with 1.28v. just monitor the temps, and bump the frequency about 20mhz at a time, then if it artifacts, bump the voltage by .5 as long as the temps are below 80c. trial and error man. thumb.gif
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post #6 of 9
My 6850 was getting artefacts at 900 and 1200mhz. I'm now on 850 and 1150 and it seems to pass in heaven Benchmark where as before I'd get lines all over the screen and it would fail halfway through. Best thing to do (Though time consuming) is bump up both stats bit by bit and keep running thing like 3DMark 11, Heaven etc and getting it to a level where it passes the test and doesn't crash out. Also remember to monitor your temps, Depending on lots of variables, (Fan placement in machine, Your GPU cooler, Cable management etc) I've noticed the AMD cards can get really hot when bumping up the voltage hence why I've left my voltages alone and have just over clocked to the limit without changing it. Also I used Sapphires Trixx to get the best results on my over clock. Its a good bit of software and fairly easy to manage smile.gif
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post #7 of 9
Thread Starter 
Quote:
Originally Posted by toyz72 View Post

my sapphire will do 1000 on the core without a voltage increase. overclocking without a voltage increase will be safer than with a voltage increase. just keep an eye on the cards temps. i wouldn't expect to see much performance gains ocing it though...maybe alittle ,but not worth the time imo.
Quote:
Originally Posted by Arizonian View Post

Trial and error is the only way to find out. Set it to 1000Mhz core. If you can't complete a 3DMark11 bench test then bump it 0.025mV until you get stable.
Once you can complete a bench test, give your most demanding game a try. Nothing better than a stability test than a couple of hours of gaming.
If you should black screen during gaming, then bump another 0.025mV. Give it another go and see.
I don't see why your couldn't. Some cards don't over clock as well as others from same series/vendor. It's luck of the draw really.
IF you don't feel comfortable with voltage bumps, then start at 950Mhz. Bench test, and if it passes go up another 15Mhz core clock at a time until you get unstable again. Then back down one notch and you'll know your cards ceiling.
Good luck and post back to let us know how it went and how you did. smile.gif
Quote:
Originally Posted by damric View Post

There isn't much headroom on the HD 6870's due to already high factory clocks, but you will probably hit 900-950 with no voltage adjustment, and over 1GHZ on air with some extra juice. That is just an average of what I have been seeing thus far with barts, and your actual chip will vary.
Quote:
Originally Posted by Spade616 View Post

mine can do 1000 core with 1.28v. just monitor the temps, and bump the frequency about 20mhz at a time, then if it artifacts, bump the voltage by .5 as long as the temps are below 80c. trial and error man. thumb.gif
Quote:
Originally Posted by Lauvan View Post

My 6850 was getting artefacts at 900 and 1200mhz. I'm now on 850 and 1150 and it seems to pass in heaven Benchmark where as before I'd get lines all over the screen and it would fail halfway through. Best thing to do (Though time consuming) is bump up both stats bit by bit and keep running thing like 3DMark 11, Heaven etc and getting it to a level where it passes the test and doesn't crash out. Also remember to monitor your temps, Depending on lots of variables, (Fan placement in machine, Your GPU cooler, Cable management etc) I've noticed the AMD cards can get really hot when bumping up the voltage hence why I've left my voltages alone and have just over clocked to the limit without changing it. Also I used Sapphires Trixx to get the best results on my over clock. Its a good bit of software and fairly easy to manage smile.gif

Thanks for the help everyone! I have got to 965mhz and 1275mhz with no artifacts or black screens. I'll see how much further I can push it then report back.
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post #8 of 9
Thread Starter 
just got to 1000mhz and 1220mhz with no artefacts running 3d mark vantage on stock voltage!!!! this is my first xfx card and im impressed.
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post #9 of 9
Quote:
Originally Posted by mrcooler View Post

just got to 1000mhz and 1220mhz with no artefacts running 3d mark vantage on stock voltage!!!! this is my first xfx card and im impressed.

Great Job! 1000Mhz core is about the max your going to want, especially 24/7. Nice over clock that's just tad shy of hitting stock 6950 score for less cash. thumb.gif

Have you tried playing some games intensively to give it the ultimate test? If you get any black screens in gaming bump the voltage just a sliver to regain stability. + 0.025mV would suffice I bet.
     
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