Well I suspect that somebody has a GPU miner active . one user has 40 MH/s on suprnova . Which to be honest 16 core = 650 kh/sec so lets see it needs around 80 cpu's with 16 cores. Makes sense ? Neah ... I am 80% sure that it's using GPU...
I am using 2xXeon E5-2670 = 16 cores and gets me 650 kh/sec. So I guess Xeon Phi after some quick google research could do double .