basicly, if you went with a Core I7 920 on a EVGA classified board with the full cover block on the board, SLI FC with a CPU like a EK Supreme, and then a couple rads. You will start to see the limits of the MCP350. A loop like that, you might need dual pumps for a loop like that.

For what you are doing, that pump will be plenty.

If water doesn't flow, temps will suffer.

How often do you change cards? I would honestly look at a FC solution for that card. They are only about $110 dollars, and once you look at the fittings and everything, I think you will come close to $80. Also, 5850/5870 blocks have waterflowing over VRMs now, which means more more potential on an OC.
http://www.performance-pcs.com/catal...ducts_id=26844