Most machines give me 0,1h/m , some 0.2h/m and only the Xeon X series give 2h/m or more (highest 5h/m)
Not sure about AES-NI. I'll try to find that out. Do I have to run the miner with special parameters if I want to take advantage of AES-NI?
In any case, I tested Primecoin/Datacoin VS Memorycoin and at least according to my calculation, XPM/DTC pay better.
Different machines will probably give you different rates of return for different coins. The 2h/m minute machines sound like they are AESNI enabled, so you might find those are more profitable to put on MCC, with the others on XPM. 5h/m =~ $5/day on MCC atm.
Sometimes a machine has AES-NI capability but is disable in the BIOS. Other than that, the software should pick it up automatically.