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6950 is being strange

gropingmantis said:
yeah I've been finding this this morning anything other than stock vram starts to give gives crashes on the 3rd Heaven run and the increase in fps is minimal. On the other hand with stock vram I can't get over 900 core clock without a crash in the first Heaven run.
Click to expand...

It's because your voltages have went from 1.175v when you had the 6970 BIOS to 1.100v on the 6950 BIOS. Mine and a few others with 6950s only manage 890-900Mhz on the core with stock voltage so your card is fine ;).

I use my original BIOS, I unlocked my BIOS with a script to unlock shaders only and leave my 6950 Memory timings how they should be. Then after that I use Radeon BIOS Editor and raise my voltage from 1.100 to 1.175 which gets me 975Mhz core and 1500Mhz memory but this is only for benchmarking. I just run my games at 950/1450 due to heat and wanting to keep the fan noise down.

You can only change the voltage with Radeon BIOS Editor btw. Change anything else and look forward to a blank screen on start up (thank the dual BIOS). I've never had this happen to me but a few people have by messing around with something rather than the voltage.
 
People need to stay clear of the 6970 bios, it just isn't suitable for the 6950 card.

Contrary to what seems to be popular belief, the 6950 is not just a crippled 6970, there are differences in voltages, memory chips and probably more.

The shader unlock is a much better option and will see you to greater than 6970 performance with a relatively mild overclock.
 
MikeHiow said:
People need to stay clear of the 6970 bios, it just isn't suitable for the 6950 card.

Contrary to what seems to be popular belief, the 6950 is not just a crippled 6970, there are differences in voltages, memory chips and probably more.

The shader unlock is a much better option and will see you to greater than 6970 performance with a relatively mild overclock.
Click to expand...

It's just different memory timings. The core with the default 6970 voltage of 1.175 gets the same clocks roughly as the 6970 from all that I've read and seen so far (I hit 975/1500 benchmark happy, 950/1450 Game happy). I've hit 1000Mhz on the core with a voltage bump as 6970s have been doing also. The shaders are not laser cut so this is the same too :).

6+6 vs 6+8 pin is different also but this has been long discussed and I've yet to see where this difference effects the 6950 unlocked with 6970 stock voltage.

So yeah, it's just the memory timings. I had screen tears and glitches using the 6970 BIOS so just unlocked and then upped my voltages again with RBE.

I agree though, stay away from the 6970 BIOS and just unlock.
 
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