Ok, heres what I designed my block around. On a cpu, you have about 100w/sq cm on a peltier(50mm 220w) you have 220w/25sqcm thats only about 8.8w/cm.
On your block, you should just make it really shallow and wider, same as the lumpy channel block, but with more width. Ill post some pics of mine later.
Jon
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