My office may be getting rid of a 1st gen Intel Mac Pro. It's a dual proc 2.0GHz dualcore (PacPro1,1). I've been looking around, it seems like I can get a pair of LGA 771 Quad procs for 200$ http://cgi.ebay.com/Lot-2-Intel-Xeo..._Components&hash=item3364f20166#ht_569wt_1141 Will these work in a 1st gen Mac Pro? Research turned up info on all the 2008 and later machines, but I couldn't find anything on the original. Thanks for any advice.