[QUOTE="Andy"]\nDo you think that this is normal?\n\nIt only varys when the CPU usage rises. I have enabled Hyper Threading\nand this has reduced CPU from 100% to 50% but the fan still revs\nslightly when that rises.\n\nIt may be reving up slighly. I cannot tell. It was a brand new machine\nso it must be normal.[/QUOTE]\n\nI asked my local computer shop and they said computers today do vary in\npitch noise depending on the workload.