System is used for very high fps gaming. Gpu/s does not have any problems with heat even at the highest load (but with the high ambient temperatures in my room of 110 F or so it can reach at maximum of 70 C). Cpu on the other hand has a high default vcore of 1.256 and requires a high amount of voltage to be stable. All the gpus are working atm but I can't seem to get all of them working together in crossfire (I've gotten gpu 1 and 2 working in crossfire before). At the moment I'm only using the bottom most cpu til I can fix the motherboard (or replace it later when I upgrade) connections and to save on power usage until I get a MST Hub so I can game in ultra high resolution with all 3 of the 3d monitors. One rx 290x is enough to run most of my games at or near 120 fps thus the multigpu setup is intended for multi-monitor gaming with or without 3d (on of reasons I went with amd). Most of the rig is cooled by water:the motherboard, the gpus, and the cpu are all cooled by water in two different loops. I started building the rig the week of thanksgiving and Ive been working on fixing any problems that came up and improving on the design of it. The case itself was custom built by frozenpc and includes sound proofing material to help reduce the level of noise (the radiator cpu uses was put in by frozenpc). To note my cpu has its vcore set to 1.365, its cache voltage to 1.2, its cache mult to 44, all its core mults set to 45x, its memory using its profile xml profile (set back the unstable memory to consair and got replacement set), and other settings that I've set in bios but don't care to look up. Just so you know the 4 hardrives are used in a raid 10 array for extra storage and backup purposes. The listed cpu temp under load under normal gaming conditions (changed since people keep getting very rude) and the max temp reached using prime95 is about 93 C. I will likely upgrade when the Skylake microarchitecture is released since haswell is extremely heat limited because of the voltage regulator on the chip (I chose haswell for its energy efficiency not its heat profile). Might not need to upgrade for a while since if I do in crossfire Ill have enough fps even for ultra high res (but if next amd line works in crossfire with rx 290x then I might if have enough money saved). At a later point I'll likely upgrade the case to one with more room for cables and tubes and might add another radiator if I had a stronger pump for the cpu's loop (alas I don't have inf money lol too expensive to add new radiator and stronger pump/reservour). Results are from latest 3dmark suite.