IBM? i thought it's done and it will offical be called Lenovo now, since Lenovo bought their user computers but IBM only sells servers now
Back on topic - they basically use these computers to fold anyways , its just instead of folding for the cure , its folding for that particle combination or solution to a super huge equation.
I am pretty sure they do not use windows on these monsters. I might be wrong if microsoft had a distro for large clusters of computers and super computers.