Total War: Shogun 2
World of Planes (alpha)
Hard Reset Demo
The diagrams show that the MSI R6950 Twin Frozr III Power Edition/OC is roughly equal to the Sapphire Radeon HD 6950 Toxic Edition. There is almost no difference between Radeon HD 6950s with 1 and 2 GB of memory and working at 850/5200 MHz as the next diagram indicates:
The two cards are generally within 1% from each other, the 1GB version being even faster in some tests. The gap occasionally grows to 2-3% but is never larger. This difference may even be due to variations in memory timings as the MSI and Sapphire cards use memory chips from different brands. Another thing to be noted is that the results are correct for 1920x1080 whereas the amount of memory is going to be a weightier factor at 2560x1600. However, the performance of a Radeon HD 6950/6970 card is going to be too low for comfortable play even at 1920x1080, except for a few games with lower system requirements, so you can hardly use them for 2560x1600 anyway.
Then, we can also see that the MSI R6950 Twin Frozr III Power Edition/OC, when overclocked to 940/5680 MHz, is ahead of the more expensive reference Radeon HD 6970 clocked at 880/5500 MHz. Even though the gap is only 2-3% on average, the MSI card seems to be preferable to purchasing an HD 6970.
Here is a table with the full test results: