I'm also considering nearly the exact same thing:

Asus Maximus Extreme
Q6600

I'm also getting the ATI HD 3870's, but I'm going to try for a 3 x Crossfire configuration.

Of course I realized today that the third PCIe slot (eg, bottom) is only a single-slot and not a dual slot.


I'm looking into doing water cooling of the three 3870's with EK FC3870 blocks.

Also looking into EK blocks in a separate cooling loop for the CPU / NB / SB / Mosfet / Crosslink chips..

I plan to remove the integrated heatpipe assembly and take measurements for EK..


Flow layout and radiator requirements are undetermined at this point, but I'm planning around a CM Cosmos 1000 case.