Thx for reply, yes i have since looked at WD Black specs, and seems upto 60c is ok, i mean within the limits for the drive, but cooler the better obviously, i have just ordered another front fan to blow in over the hard drives, the one that is already there is up higher so misses the drives, but there is a fan space that will blow some air over them, i have ordered the same fan as i already have in front, corsair 120mm 0.38A A1225M12S, i think its best to keep them the same ?, do you think this fan will be ok ? runs at 650 rpm on standard fan profile when pc is running at idle, or at 1360 rpm on turbo.