Okay, I know this has beaten to death, but I'm still stuck on deciding... I'm going to be putting a 3.0 P4 and either 2x512 or 4x512 memory in it (need memory help here). I've got a Prometeia Mach I also. My concern is that I've heard of lots of problems with the IC7 and none with the P4C. Also, with the Prom Mach I, I've heard of problems getting some boards to work. I have an ATX power conditioner, would this help? I'm looking more for real world performance than just benching. Also, on either board I'll be doing the vdimm mod to get to 3.2vdimm so stock vdimm volts aren't gonna matter. If I'm not mistaken, both boards have 1.75v or more on the core? (I've been told not to go over 1.75 or so even with Prom) Any other suggestions?