Are you doing allot of overclocking with the Phenom X4 955? Just wondering since you are getting an external sink. if you are, then it should fit, its only 120mm. Otherwise, the stock heatsink should be fine?
Not sure about the overclocking yet... the last PC I built was 5 years ago and things have really changed. I've got alot of reading to do but I do some gaming... TF2 and possibly COD. So, I'll probably be overclocking a bit. I'm still waiting for the CPU to arrive. I'll see how the stock heatsink looks. I'm thinking you're probably right!