Stock 4850 single slots were atrocious for heat, so the 1st thing i did was grab a VF1000 for it. That being said, the HD5K and 6K all seem to have much better cooling than the 4000 series on the whole.
Distributed Computing Hardware
CPU: i5 3570K and i5 2400 = 8 cores (Crunching for TPU atm)
GPU: 7870 (8 wu's) and 7770 (4 wu's) = 1920 GCN cores (Folding for TPU atm)