I haven't cracked RC5 for a year or so, and back then I was sending my blocks to my school. I'm getting back into it, so I've switched to sending my blocks to Anandtech. I have a couple of questions regarding RC5. Does RC5 use the FPU or integer unit of a CPU? In terms of pure MHz, which CPU runs it the fastest (Thunderbird, PIII, Xeon, SPARC, etc)?