Windows and HPC?
Some people will try anything.
If you are looking for a desktop supercomputer cluster that can use X86 or a mix of X86 and GPU coprocessors to run simulations, then Russian supercomputer maker T-Platforms has a machine for you. Or rather, it will by this fall. It's called the T-Mini P, and it is basically a P8000 blade enclosure mounted on wheels. Not so …
You know, a skinny node with six Trinity dual-core + HD6000 class graphics, 17W chips might be kinda interesting. The individual CPU cores are pretty wimpy, but that's quite a lot of single-precision GPU goodness for 17W, and with eight of these nodes you may get a surprising amount of flops/$.
Just thinking ...