The stock cooler on the 870 is a piece of garbage. Get an aftermarket one.

A Corsair 800D with an externally mounted radiator? Maybe it's just me, but that kind of defeats the purpose of getting such a case, which is well known to have enough room for a hefty internal WC setup.

ravenguard90

Better temps externally mounted. I could mount it internally at the top but I wouldn't trust the screws would hold the weight of the rad + water over time. You can't thread the screws in very far, it will hit the water channel.

i7 860 @ 4.0 GHz
Evga FTW P55
8 GB DDR3 OCZ
Dual 5850's

I had 2 XFX 4890s die on me, my 2sapphire 5850s have been great so far.

If you get higher FPS in games then its working. If not then you also need to have Catalyst AI on.

I had the cosmos 1000 case. If you put a 120 mm fan over the cage area at the top it does a good job at cooling the Hd's

How much memory do you have?

Buy the parts separate and put your own loop together.

Control Panel > Mouse > Pointer Options Tab, under visibilty uncheck display pointer trails

If you're getting new case you get the Corsair Obsidian 800d, it has lots of space so you put in multiple water pumps and rads with space left over. If you have reference 5870 pcb cards you can get full cover blocks for your cards. If you're doing the cpu and gpu's I would get 120x5 rad surface so something like a 120x3 and a 120x2. Get two water pumps Laing D5/MCP655 for the price and run two loops. Go for the EK Supreme HF for the cpu, it gives great performance and comes with backplates for Intel and AMD in one package.