Today I was flipping through the "Design" page on Apple's site for the mac pro, and took a closer look at the processor drawer, and saw the reason why they didn't do 6 RAM slots per CPU: The case is too narrow. The drawer fills the bottom of the case, and 4 RAM slots and the heatsink is clearly enough to fill it from side to side. The whole setup already covers the board from front to back too, and the heatsinks look like they stretch up all the way to the "roof" of the "windtunnel". Which begs the question, why the hell not just make it wider? Or deeper, and use a more rectangular heatsink that extends more front-to-back then sideways? Either way, the think still wouldn't be overly large. Is it just me, or does this whole upgrade seem a little thrown-together? Like, "We wanted it released with the new Minis and iMacs, but a 3500/5500 heatsink and 6 RAM slots wouldn't fit side by side on the floor of a PowerMac G5 proportioned-box so we just did an awkward 4 slot Nehalem board so we wouldn't have to take the time to re-do the outside of the case a bit"