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Target OC and Voltage on Sapphire 6950 1GB?

post #1 of 3
Thread Starter 
I picked up a 6950 from RMA. What voltage and speeds should I shoot for? Do I need to increase the core voltage to hit a target of 875/1350?

I'm using the unofficial overclocking with MSI Afterburner.
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2500K@ 4.8ghz 1.37v in CPUZ Asus P8Z68-V PRO/GEN3 6950 stock Corsair 16GB 1600 
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My System
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CPUMotherboardGraphicsRAM
2500K@ 4.8ghz 1.37v in CPUZ Asus P8Z68-V PRO/GEN3 6950 stock Corsair 16GB 1600 
OSPowerCase
Win 7 64 Corsair TX850 Lian-Li Full tower 
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post #2 of 3
That all depends, really with overclocking you could try and shoot for a speed which you think will be stable, but usually I would just recommend manually increasing. Heres how.

Step 1
Choose a small increment to increase by, and a program to test with. I prefer 5-10mhz and unigine

Step 2
Raise the core clock by the speed you choose (again I like 5-10mhz), and hit apply.

Step 3 test it out in the program you selected earlier, and watch for artifacts

Step 4 if you see artifacts back down to your last stable clock speed. If you don't repeat steps 2-4

Step 5 once you have found the max for the core, repeat for the memory clock.

Alternate step 6 Now once you have found the max clocks at stock, you can try increasing the voltage slightly, and repeating the process. With raising the voltage though it is best to use a program like furmark to make sure it doesn't get too hot.

Final step Now regardless of if you followed step 6 or not, after you found speeds you think are stable use OCCT and test for errors, after an hour if there are no errors keep the clock speeds, if there are back down on both the memory and core clocks, and repeat this step, until there are no errors.

Note this is probably not the best method for overclocking, it is just the one I use, and it seems to work for me. Why you don't want to just base your overclock off someone else's, is because if you are unlucky that speed could be unstable for you at any voltage, and two you may be lucky and that overclock may actually be only a fraction of what you card is capable of.
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Ballz Killswitch
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k Intel DP67BG GTX 670 FTW+ 12gb DDR 
Hard DriveHard DriveHard DriveHard Drive
samsung 830 Seagate ST31000524AS Seagate ST3500418AS Seagate ST1000DM003 
Optical DriveCoolingOSMonitor
dvd Antec Kuhler 620 Windows 7 64 bit Achieva Shimian QH270 
MonitorKeyboardPowerCase
Samgsung BX2231 Quickfire TK cosair 650TX NZXT Switch 810 
MouseMouse PadAudio
CM Spawn Steel Series Qck Turtle Beach X12 
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post #3 of 3
My Powercolor 6950 1GB overclocks:

@ 1.15V = 880Mhz Core
@ 1.25V = 960Mhz Core

Max. OC @ 1.3V is around 980-990 MHz.
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