[pHaestus]

I think I might have an explanation for the high W with the Cascade. When I removed it the other day I accidentally touched the northbridge hs (passive) and burned my finger (ok not to the point of a blister but it was red for a bit). The cascade and other 4 hole blocks are really close to that nb heatsink while the MCW5000-A is not (it's square rather than rectangular). So my guess is that extra heat from nb (as much as 10W though?) is being dumped into the cooling loop, and that the better the wb the more heat goes in (from copper traces on mobo and possibly from air as well. I'll put a fan on that hs and see if the numbers are a little more sensible. My cascade sprung a leak though and currently my test system is being air dried.