Hi all, I am about to purchase a second-hand 2008 Mac Pro, and was looking for some advice on how to upgrade. Here are the specs: 1x Quad Core 2.8Ghz CPU 22GB RAM No hard drive ATI Radeon HD 5770 As you can see, the machine has already had the RAM and the graphics card upgraded. So I would be looking to upgrade a few things: The CPU: it is my understanding that the single-CPU Mac 3,1 has an empty CPU socket - is that correct? In that case I can simply purchase another 2.8 CPU that has been pulled from a Mac 3,1 and go dual-CPU right? (If so, this is great because they are available ridiculously cheap on eBay). I would also need to purchase a heatsink which is also easily available. The hard drive: this machine does not have a hard drive so will need one. I am looking to get an SSD, and have read that on these machines it is best to use the PCIe slot. Firstly, does anyone know how much faster this is than simply using the SATA slot? Secondly, I know that I have two options: either purchase a ready-made PCIe SSD drive (which I understand is more expensive), or purchase an PCIe SSD adapter card, and then put in a standard 2.5 SSD. Is this correct? And if so, does anyone have any recommendations as to particular adapters or types of adapters? I also have a standard 500 stata HDD pulled from a 2010 iMac upgrade - i imagine this will work? And then a simple USB 3.0 PCIe card Could anyone let me know if I've missed anything else? Anything else worth upgrading? And general upgrade advice for this machine would be greatly appreciated. Thanks!