I'm curious about the form factor's benefits and drawbacks. I understand why it died out, but it seems like it's a genuine improvement over ATX, cooling-wise. To ask a theoretical question, what if BTX had a resurgence? I know it's anecdotal, but the E521 in my signature uses BTX, and I was impressed with how cool and quiet it remained under stress from Prime95. It has only one 120mm fan mounted at the front - not including the fan cooling the GPU.