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6970 vs 6950 unlocked - Page 2

post #11 of 40
Quote:
Originally Posted by BradleyW;13100473 
But..the 6950 2GB Ref is the bang same as the 6970. It is a 6970 with a different bios flashed. That's all!

This is technically incorrect.

The 6950 has what appears to be a cluster of resistors which are absent on the 6970 (see this picture). I also believe it uses physically different ram chips.
Edited by fluxlite - 4/12/11 at 2:22pm
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post #12 of 40
Almost no 6950 will run faster than 1375mhz without error correcting. Most benchmarks like 3dmark11 aren't affected by the error correcting, so many people wrongly assume their card runs fine as their score increases.

I've found Heaven with tessellation disabled is the best way to determine error correction. However, when you get to a certain speed, you will begin to gain fps due to the raw power compensating for error correction.
For example (figures are not accurate and just for illustration):
1375mhz - 45fps
1400mhz - 43fps
1425mhz - 44fps
1450mhz - 45fps
1500mhz - 46fps
Edited by whybother - 4/12/11 at 1:19pm
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post #13 of 40
Per my understanding, RAM timing and rated frequency is different as well on the 6970. If I am to guess, overclocking head room is more on the 6970.
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post #14 of 40
Quote:
Originally Posted by whybother;13100552 
Almost no 6950 will run faster than 1375mhz without error correcting. Most benchmarks like 3dmark11 aren't affected by the error correcting, so many people wrongly assume their card runs fine as their score increases.

I've found Heaven with tessellation disabled is the bet way to determine error correction. However, when you get to a certain speed, you will begin to gain fps due to the raw power compensating for error correction.
For example (figures are not accurate and just for illustration):
1375mhz - 45fps
1400mhz - 43fps
1425mhz - 44fps
1450mhz - 45fps
1500mhz - 46fps

+rep to you. This is EXACTLY what I observed when I was benchmarking with Heaven 2.5 (with tesselation normal though. I could comfortably go past 1400, but observer lower/no change in performance. So, dropped it down to 1350 (see sig rig) and was the sweet spot for me.
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post #15 of 40
Reference 2G 6950's is the way to go. I unlocked the shaders on both of my cards with no problem.
    
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post #16 of 40
There are marginal differences such as for example the higher Memory Bandwidth of the 6970 or tighter Memory timings.
Those marginal differences do however not impose a difference in performance between the 6950 and the 6970.
You can imagine a 6950 to basically be a downclocked 6970 with very slight changes in the interior.
An overall look of the differences here:
new.png

Also it is clearly shown by a techpowerup review that a 6950 which has been Shader unlocked to 1536 shader units + overclocked to the stock speeds of a 6970 performs equally to normal Stock 6970:)

Untitled.jpg
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post #17 of 40
Quote:
Originally Posted by fluxlite;13100550 
This is technically incorrect.

The 6970 has what appears to be a cluster of resistors which are absent on the 6950 (see this picture). I also believe it uses physically different ram chips.

Except for the resistors and a change in where power is directed to, i believe the memory chips may also be just a better batch, high class of the same class if you get what i mean. Also, people who get lower fps with overclocked Vram, i've noticed this on many ati cards i've had in the past.
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post #18 of 40
Why would anyone buy a 6970, then? Does the warranty get voided with an unlock?
post #19 of 40
I wouldn't take any Heaven results too seriously.
Game benchmarks show that heavy tessellation works Radeons and bogs down thier overall performance.

As far as the two GPU's, I would pay the extra and get the 6970, but thats just me.
Not all 6950's unlock, flash and overclock so well and even when they do your still missing out on some power/agility the 6970 has, and even then your only at stock 6970 power which is not impressive.

If trying to save money the 6950 is a great choice though.
Edited by amstech - 4/12/11 at 1:26pm
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post #20 of 40
Well the 6970 uses 6+8 pin pci power, while the 6950 uses 6+6 pin power.
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