Currently the only thing holding me back from upgrading my CPU/MB/RAM is the fact that I can't buy an Opteron yet (well, technically an Athlon64 I guess), and since I'm water-cooled already theres no way I'm going back to a HSF in the upgrade. So blocks for these new chips is of great interest to me.
What I'd really love to see is a version of morphling1's new block optimized for the opteron (I prefer the 2-barb design over Cathar's 3-barb micro-channel blocks - and I like the clear top he has on it). And the bigger core means we should get more micro-channels over the area that counts, making the thin baseplates even better as heat-conduction sideways becomes less important. I think microchannels in general are the best way to optimize the two points I think are most important in a block:
1. Maximum surface area between water/copper to get heat out of the block
2. Minimum copper between the water and the CPU - in the case of a WB the copper insulates the core from the water - the thinner we make it the poorer job of insulating it does.
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