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Could someone help me overclock a xfx radeon hd 6870

post #1 of 7
Thread Starter 
ok i have i single fan style (kinda look like a turbine) 6870 and im wanting to get the best performance i can out of it and it be stable. can someone help plz?
post #2 of 7
Thread Starter 
core clock is 900MHz, core voltage is 1.175, memory clock is 4200MHz, and fan is on auto
post #3 of 7
First download either Trixx or MSI Afterburner to do the overclocking. Next download furmark to test your overclock.

When overclocking do core and memory separately. Start with core clock and go up 10mhz at a time. Once furmark freezes that is your max core clock at stock voltages. Now put core back to 900 and do the same for memory. Once it freezes same thing. If you want to go past that you need to start adding voltage which means higher temps.

Let me know if you have any more questions.
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post #4 of 7
How I would do it is, Change the fan profile first.
Set it so fan is 100% on at 85C since once you get past 75C with Barts core stability goes down hill fast.

Then do as krisco65 has said, But also keep checking temperatures as your doing it. Ideally you want to keep it below 85C.
Also before your set on a final core clock run a bench mark like 3d mark 11 since Iv found furmark is always stable a little higher then benchmarks/games because it doesn't fully load the memory controller.

Once you have verified its fully stable EG runs a game for a hour no problem move on to overclocking the memory.
Drop the core 5mhz lower then where you found it to be stable and do the memory. Dont use furmark to stress it when overclocking memory since furmark puts no load on the memory or memory controller. Personally I do 3d mark 11 runs to find make memory overclock.
Then once youv found the point it crashes/artifacts (weird colours/glitches) lower it by 30mhz since the memory has error correction which slows the card down when its with in 10-20mhz of being unstable.

If temps are still good you can push the core voltage a bit higher which gives you more room to overclock the core but not the memory. With stock cooling youll most likely be limited by the temp once you play with voltages.
post #5 of 7
Thread Starter 
would Asus gpu tweak work? i have that already, it came with my software pack for crosshair V
post #6 of 7
Hey guys I have the xfx 6870 dual fan model. Im at 940/1080 stable but I want to increase stock voltage but I cant find it in bios and afterburner 1.2 its greyed out even when changing the setting. It seems locked, any ideas?
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post #7 of 7
Dude, I'm sorry to say, but you can't modify the voltage on a 6870 non-ref. You can't even change them by editing to BIOS.
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