MCW60 rev 1 vs rev 2

[lilmanmgf]

So I currently have an MCW60 rev 2 on my 5850. I recently bought a second 5850, and I'm looking for a second MCW60 rev 2. So far I have been unable to locate a rev 2, but I have come across a rev 1. Does anyone have any experience with the rev 1 vs rev 2 cooling power? I know the cooling pin size changed from 1mm to .6mm. Here is what my setup looks like sans crossfire:

 

[SonDa5]

My guess is that revision 2 will flow better. I have no experience with either just basing my guess on the specs you listed.