From what I understand the default speed of the booster 1 fan in a Mac Pro 5,1 should be 600 rpm. I am mentioning this due to the low "whirring" I am hearing with the mac on the desk 2 - 3 ft from my sitting position. I hear reports of these things being whisper silent. Wondering if I am having an issue. CPU temps remain @34 Celsius. The 5870 seems to run a little hot though. Anyhow just wondering if this normal?