Just want to add my experience. I have a single CPU 2.8 Mac Pro since March 2008 and I am very happy with it so far. Of course I was hoping to be able to "upgrade" to 2 CPUs whenever I have the "few bucks" for it. However, as seen in this forum, the upgrade is not at all secure or simple. At least I believe that the socket for the 2nd CPU is present in the 2008 single CPU Mac Pro. A Xenon E5462 will cost me around $860 (no, I didn't say this upgrade was cheap) plus tax and shipment from the US (I live in Switzerland). What really made me worry was how to get the Apple heatsink for the CPU!? I went to a local Apple reseller (they also have a repair center) and the guy told me yes, he could order a heatsink for the Mac Pro
... then he argued that the planned upgrade is not possible because, as far as he knows, there is no socket for CPU number two! Okay, so after writing this reply I will open my Mac and see for myself. If there is a socket I will order the heatsink next week and the CPU as soon as I get a confirmation that I really can get the desired part from Apple. I let you know if someone here is interested. Of course, some of you might state now that around $1000 or more for this upgrade is not worth it, but I don't want to exchange my Mac for a new model ... and I like to mess around with hardware myself
... would be too sad to have a dual-workstation Mac Pro with just one Xeon forever
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If you are happy with your single CPU, what's the need for the another CPU? Your friends who have a "full pair" make you feel less than adequate? You have no "bragging rights"? Your Mac Pro leans to one side--the single CPU side? Inquiring minds want to know.