I think the machine is having a torture test as it is. Its running 2 mir servers off it eating all the cpu power and almost all the ram. Cpu temps are up to 52 degrees in a 40+ room temp. As for the mainboard, it is designed to take the 4 pin and 3 pin connectors. there is a jumper to set what type of fan you are using.
I cant think of a perfect way of wording this. But with all moddern main boards, they take the 20/24 pin power connector and an extra 4 pin square block aswell. On Xeon machines, that 4 pin block is actualy an 8 pin. Since only completly OTT power supplies actualy have the 8 pin block, i bought a converter kit that runs off the 12V rail.