XFX HD6950 1GB Overclocked Edition Review
 

Everything about this card is appealing — we see a visible and statistically significant increase in performance in the XXX Edition over the standard XFX HD 6950. The direct contact heatpipes do a good job at keeping the card cool under typical situations, however it becomes obvious that the performance of the cooler falls apart under a heavy heat load. This heavy heat load is from putting a huge overclock on the card and applying the extra voltage to the GPU. We see this in other "DirectCU" coolers, and they tend to fall apart in this same way.

http://www.overclockersclub.com/reviews/xfx_hd6950/