Blimey lots of activity here yesterday
If you look at PH's graph
http://forums.procooling.com/vbb/showthread.php?t=8941
There seems to be 2 distinctly different curves. The Swiftech has a very different curve to the other blocks. Is this largely because of the baseplate thickness? It seems to make sense to me in my little world that the base plate thickness would have quite a large effect on the shape of the curve. I'll have to try and find that article Bill mentioned
Edit
Found the article quite informative. I think I'll have to crack out the Ansys. I ought to be revising Ansys now anyway for one of my exams although we are only doing structural stuff