Re: :( CPU Temperature
Your heatsink is either not making a good contact point with the CPU, or the temperature sensor is faulty (and in some cases, it's not the CPU but the motherboard's fault)
Have you done the touch test yet? Does the heatsink actually get very warm at all? In a lot of these cases, the system reports some obscene number, but the heatsink itself is actually very cool to the touch - and even the area around the CPU is also cool (another thing to check for)
Also, we use the Antec 300 at work - there is nothing wrong with that case's default air flow, if all the fan slots are being used, that case is downright chilly. Something is amiss with the temp sensor or lack of contact with the CPU.