I'm acquiring some Peltier related junk. I have a Dell H2C unit that has a simple AIO 120mm water loop and 4-40W Peltiers on a water block. It was programmed to cool down to ambient only so no condensation issues, and no heat added from the radiator. It always bothered me that there were no heatpipes in the finsinks on the Peltier block. I may have found a solution for that. I just converted an HD6990 to an aftermarket big air cooler. I took apart the OEM cooler and found 2 Vapor chamber heatsinks. They each have a 40x40mm riased area for the GPU. It looks like they would be good heatsinks for a pair of Peltiers.
The system I'm thinking of would have a large 200W heatpipe cooler, Probably a TR Macho 120 since I own it already. A water block ( Corsair pump block?) on the backside of the CPU block, between the heatpipes and under the fins. I can get the temp. there once the system is running with a laser gun. A pump and loop to another small water block between 2 60-80W Peltiers sandwiched between the 2 vapor chamber heatsinks. The GPU they were from was rated 375W. I'm thinking a separate out board PSU that will switch on/off by a thermal probe at 40*-50* C. I'v seen a lot of surplus server heatsinks and always thought they were just big finsinks. Now I'm beginning to think they might be vapor chamber technology. Any way I'd like to know what you think of this. Big air with a parallel Peltier loop on the backside.