Overall a wonderful product, lowered temps from 45C/80C idle/load, to 22C/35C. Cooling efficiency is excellent. However, I found on an XFX Black Edition there is a 1/8" airgap between the block and one of the VRMs. I solved this by wedging a shim of copper in the void and adding thermal paste, but be careful. This minor discrepancy has little impact on my overall experience. Just a little FYI, as the block is extremely efficient and does better than I would've hoped.