The slot 1/A may be of the same type found on the x86, but is uses a proprietary CPU board in the slot, which houses a PPC obviously. Looking at this raised a question to me....on the pic of the latest A1.5 design, is there a way to attach a heatsync and fan? Or what? I didn't see anything around the CPU to suggest, but then again I am coming from working on many x86's and PPC is new to me.