As far as i'm aware for the PS3:
-linux only available on the phat version.
-linux does not have access to the GPU hardware, so restricted to software graphics modes
-The cell has one PPC core and 7 SPEs. The SPEs are specialised sub-cores and i doubt linux even has access to them, let alone support for them
-so you end up with a single core PPC CPU and 256MB ram to play with.
For windows, you'd need to emulate an x86 CPU as well, so you're going to have minimal resources left after windows is running.
In short, you'd get much better performance out of a cheap second hand PC, or even a cheap netbook.