iroc- agp has at least another year in it; and there will probably still be AGP slots on mobos for 2, though by then buying AGP video cards could be harder. And no, BTX won't be compatible with any ATX case. ATX PSUs may or may not be compatable with BTX cases, but if they are you'll need an adapter for the mobo connector. The motherboard, aside from different component locations, is a mirror image of ATX and will be mounted on the opposite side of cases. I'm guessing that part is just a trick to prevent you from modifying ATX cases, but maybe I'm just cynical.
Jaydee- The intent of the design is to cool a high power CPU and graphics card with only 2 or three fans. I'd rather have my graphics card cooled by warmed up air moving over it and out the back from the CPU fan than have it sitting the other way, with just a pocket of hot air to cool it down. If you want to avoid that you have to add a fan, and even then slot size restrictions obstruct good quiet fans. Furthermore, your CPU needs good cooling much more than the GPU; GPUs have considerably higher tolerance for heat and considerably lower heat production than the CPU. Furthermore, the great majority of users won't even be stressing the GPU with video games at all. (And most of them won't be stressing the CPU either but thats a whole different story). Cooling this form factor effectively with two quiet fans will be quite easy; especially since the CPU receives ambient air which is efficiently vented; despite the 'preheating' of case air, case temps could easily lowered below your usual ATX case temps with the right configuration.
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