c/w is = (Tcpu-Tambient)/W
Hope this helps.
BB2k I got a C/W of .29 also, which for a watercooling system is not too good (I got .16 with my alpha 8045 on a o/c'd 1.4Ghz Tbird) though a pump upgrade should fix that
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I was scanning over this post and was seeing generally the thought that channels don't produce turbulence. Which infact they do (if they take up the whole chasm so that water cannot flow over them instead of through) If you want I can Email you an Excel spreadsheet that can calc the possible heat transfer for paralell(sp?) channel blocks.