2006 Mac Pro w/3GHz Clovertowns (Quad-Core X5365s).
( Doesn't use the extra cores of the slower clock speed CPUs) And by the way, the processors ended costing me $150.00 for the pair and the 8800GT was $170.00 U.S. Overall the system seems snappier - Fractal reported 60-65 Gigaflops! Xbench actually went down from 171 to 154. ( Some other 2006 Mac Pro owners also mentioned that.-Mike) I used one of those stripped screw extractors, very carefully! and it came out. The only problem was a partially stripped screw on one of the Processor heat sinks.
"Upgraded my original 2006 MacPro 1.1 (Dual Xeon 5130 2Ghz processors) with two Xeon L5320 1.86GHz low power Quad-Core processors and also put in an nVidia 8800GT (Flashed PC model) to replace the original nVidia 7300GT. ( Previous reports here on 1st gen Mac Pro Quad-Core ("Clovertown"/X53xx) CPU swaps used higher speed CPUs (typically 2.66GHz or 3GHz) so even with apps that don't use all the cores, you still get a performance boost.-Mike) Recent Updates | Mac Upgrades/Repairs | Storage | Video | Audio/HT | Apps/OS/Network | Home 2006 Mac Pro with Xeon L5320 (1.86GHz) Quad Core CPUs