I've used HP DL machines at work. I found them to be blazingly fast, but very expensive expensive - up to $15k, I am curious though, although the spec we typically used (e.g. dual AMD Opteron 2.6GHz, ...
In Market there are two types of processors as Core2Quad and QuadCore. What is the architectural/performance difference between two flavours? I have the same question with older Core2Duo and Dualcore ...