This is fast enough at the minute for me, plus it was free. I've already stuck another 250gig harddrive in there, and nother 2 fans. Got the case temp down to a stable 30deg C, and the CPU currently sits at 42 under normal load, but the fan is making a right racket, which is why I want to chage it. The quiet fan I bought just wasn't powerful enough for the CPU, as temp went to 50deg C with no load on the CPU.