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6950 questions

Other programs may be able to change the voltage but I think you have to use the Catalyst Control Centre for power control.

Is that a problem?
 
The other overclocking software such as afterburner and trixx appears to be setting the power control back to 0 as I get throttling (tested as I get lower fps in games and benchmarks). Even if I set the voltage max in trixx it appears to be throttling the card. In overdrive if I set power control to +20 and clocks to the overdrive max of 840/1325 I get 40fps in furmark benchmark. If I open trixx set voltage max and chose 880/1375 I get less fps. This happens in games as well.
 
Download GPU-Z.

If you enable the log file you'll be able to see what it's actually doing rather than what it appears to be doing.

I'm not sure you should be setting the voltage to maximum, whatever that is. I think the most you should be using is around 1.25V.

Also increasing the speed of the VRAM on these cards can cause slowdowns if you go too far. Rather than just crashing the error correction kicks in and you get poorer performance at faster speeds.

I'd start by leaving the VRAM at stock speeds, increase the core speed using no more than 1.25V and see where that takes you.
 
The max is 1.180v so no worries there. The problem is trixx and afterburner resetting the power control and I haven't a few clue how to fix it.
 
I've used Sapphire TriXX in the past on an unlocked HD 6950 and I'm pretty sure the voltage slider went way beyond 1.25V :confused:
 
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Google registry tweek for gpu oc works for CCC and MSI afterburner, higher clocks and volts. worked for me
 
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