Well, I'm not sure what qualifies as hardcore, but I do like to overclock. I like to get the best out of my rig consistently (with long term durability, too), so I set it up for good OC's with good stability, very careful voltage / speed / temp balancing. DIY water cooling with a car radiator is how I roll. That'll change if I ever get my phase change system designed and built (want to seal the box, use dry CO2 to prevent condensation and cool the whole interior, maybe multiple phase change blocks for CPU & GPUs). Too many other projects vying for time at the moment.

Current machine, built on a pretty low budget a while ago:
AMD Phenom 6 core (I forget the model)
2xGTX460's with custom BIOS's (vmod & OC from boot, no extra software needed)
HyperSLI drivers for SLI on AMD mobo.
I used to have a dual core that ran nicely at 4.3GHz, but with the 6 core I run at 3.8 most of the time
