Dual trays are expensive... really expensive. So much so that I can't justify purchasing one to upgrade my early 2009 (flashed to 5,1) to a dual CPU setup. So I've been searching on craigslist, and finally a dual CPU early 2009 comes up for sale. Guy wants $500 for it. Specs are 2 x 2.26ghz, 16GB RAM (8 x 2GB sticks), Radeon HD 4870 GPU, 250GB and 1 TB HDDs. I offered $450 and he accepted. Is this a viable option to upgrade my existing single CPU early 2009 Pro? Specs are: single X5690 (I would get another if the dual CPU Pro was purchased), 12GB RAM (3 x 4GB), GT120 GPU, 120GB SSD + 500GB HDD + 2 x 640GB in RAID 0 config)? Obviously I would take the best parts from both and make one machine, and then sell the remaining single core computer (with the original 2.66 quad Xeon that I replaced with the X5690) to recoup some of the cost. This seems more cost effective than purchasing a dual CPU tray outright (like from eBay). Thoughts?