HI guys I just got a mac pro 3,1 here are the specs. Earky 2008 quad core 2.8ghz 4GB memory(4X1) 500GB SATA ATI radeon HD 2600XT El Capitan DVD RW dual layer This is my first mac in about 12 years. I mainly use my computer for media. Music, Movies and maybe a small amount of light video editing.(multimedia) I'm obviously not putting much stress on the computer so I am not looking for the absolute best possible upgrades, just the most cost effective that will yield a snappy machine for every day use. At first I was thinking about upgrading RAM, but after doing some research I am wondering if it would make since to add an SSD first, since I will be storing and downloading/accessing lots of files. Does that make sense? As far as RAM goes, I currently have the 800mhz DDR2 4X1 with four open slots. I was reading somewhere that you can pick up used 667mhz ram from Xeon servers for pretty cheap. Can you just drop the 667 ram into the slot or does something else need to be done? Can you run the 667 with the existing 800 or do they all need to match. For the SSD does anyone know of a nice cost effective upgrade? I don't need tons of storage. I'm thinking 160GB will be plenty and I can move any large stuff over to the 500 gig SATA. What about the processor? I have an open slot. Could I add a 2.8GHZ, or even a 3.2 into the empty slot, or would I need to purchase them as a pair? --- Post Merged, Mar 14, 2016 --- I am looking at this ram: http://www.ebay.com/itm/like/321655090789?lpid=82&chn=ps&ul_noapp=true 32 gigs for 59 dollars seems like a steal. I know I don't need that much but for so little money, why not? I'm am just confused about the whole 667 vs 800 thing.