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Help With Overclocking 6850 Using CCC (catalyst control center)

post #1 of 11
Thread Starter 
Hello,

I am wondering if I would be able to overclock my ATI Sapphire Radeon HD6850 graphics card for a few extra fps on games like crysis, oblivion ect. I am not very good with computers so I am not sure how much to over clock the card.

I only want a slight performance increase because I am scared that because my brother tends to play games for long periods at a time (5 hours+) it could overheat and need replacing.

My case is a cooler master cm690 ll advanced and the temp of my graphics card is around 42 degrees Celsius when idle and can get to around 66-72 at the highest.

At the moment the High Performance GPU clock settings are set to 775mhz and can be set to a max of 850.

High Performance memory clock settings are set to 1000mhz and can be set to a max of 1200mhz.

There is also an auto-tune feature and would this be recommended? And what temperature should be the maximum that i should let my card get up to?

So basically I was wanting to know what speeds i could set my graphics card to safely and as I said before, it doesn't matter if it is only a tiny change in speeds. I want to be very safe on this one as I do not have a good cooling system and do not want to have to replace a broken computer.

Thanks in advance.
Vettori.
Edited by Vettori - 1/22/11 at 9:57pm
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post #2 of 11
I believe the consensus is that MSI Afterburner is the best program to use for GPU overclocking. The options and custom profiles are endless.

In your case, you could also use Sapphire TriXX.

I'd say all HD 6850s should be able to do 900mhz/1150mhz on stock voltage.
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post #3 of 11
Thread Starter 
Thanks for the reply. What if I used CCC and set it to 850MHz/1100MHz, would that affect the temperatures a lot? And would it be safe to do this?

Oh and finally does using the auto-tune affect performance?

Thank you
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post #4 of 11
You probably want to use catalyst control centre because when your graphics card is under load it clocks the card to your settings, but when idle it clocks it down to save power, less heat ect, using MSI afterburner disables this feature

To overclock:

Download a GPU stress tool like Furmark and GPU-Z to monitor your temps (Sensors tab)
Run Furmark but watch those temps, don't let them get over 85-90*C Furmark is designed to stess your GPU as much as possible (mine gets up to 80*C in Furmark but only 60*C in gaming).
While Furmark is running increase the core frequency in CCC 20MHz at a time.
If you start to see black dots on the screen (artifacts) then back the clock down 10MHz at a time till you find a stable spot. If your computer locks up just restart and test 20MHz below what it crashed at.

For the memory:

Once you have found a stable core speed start to increase the memory frequency 20MHz at a time, repeat the process you used to find a stable core clock until you find a stable memory clock.

Have fun OCing!
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post #5 of 11
dont forget if you feel up to it you can flash your cards bios to a 6870, might unlock some extra shaders if it is just a rebranded 6870, with a higher OC limit.

http://www.techpowerup.com/articles/overclocking/159 article about it from techpowerup

If you dont have an extra PCIE slot you can put a older vid card in if you brick it from flashing tho i wouldn't do it incase it doesnt work out for yeah

Also don't let your card get above 70-80C if possible as it will make it hard to get a stable overclock.
Edited by terraprime - 1/23/11 at 2:12am
 
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post #6 of 11
Quote:
Originally Posted by terraprime View Post
dont forget if you feel up to it you can flash your cards bios to a 6870, might unlock some extra shaders if it is just a rebranded 6870, with a higher OC limit.
Can you do this with a 6850? I thought it was just the 6950
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post #7 of 11
Quote:
Originally Posted by SkillzKillz View Post
I believe the consensus is that MSI Afterburner is the best program to use for GPU overclocking. The options and custom profiles are endless.

In your case, you could also use Sapphire TriXX.

I'd say all HD 6850s should be able to do 900mhz/1150mhz on stock voltage.
This ^
I recommend TriXX too, if you cant register your card i can PM a download.
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post #8 of 11
Thread Starter 
Hey everyone, thanks for the replies.

I will do what you suggested and run furmark multiple times to find stability but how long should I run furmark for each test? Thanks.
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Intel Core i7 870 2.93GHz Gigabyte P55A-UD3 ATI Sapphire Radeon HD6850 4GB DDR3 1600MHz 
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CPUMotherboardGraphicsRAM
Intel Core i7 870 2.93GHz Gigabyte P55A-UD3 ATI Sapphire Radeon HD6850 4GB DDR3 1600MHz 
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post #9 of 11
Quote:
Originally Posted by overclocker23578 View Post
Can you do this with a 6850? I thought it was just the 6950
oh my bad yeah 6950
 
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post #10 of 11
Quote:
Originally Posted by Vettori View Post
Hey everyone, thanks for the replies.

I will do what you suggested and run furmark multiple times to find stability but how long should I run furmark for each test? Thanks.
Run it for a minuite each time you add 10-20MHz when you have found a stable OC run it for atleast 15 mins to check stability
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7 x BL460c
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