Pour le modd 771 => 775 il faut consulter cette page (http://forum.hardware.fr/hfr/Hardware/Processeur/unique-xeon-775-sujet_956094_1.htm), c'est le top !
La série 3xxx est compatible
Intel released relabeled versions of its quad-core Core 2 Quad Yorkfield Q9400 and Q9x50 processors as the Xeon 3300-series (product code 80569). This processor comprises two separate dual-core dies next to each other in one CPU package and manufactured in a 45 nm process. The models are the X3320, X3350, X3360, X3370 and X3380, running at 2.50 GHz, 2.66 GHz, 2.83 GHz, 3.0 GHz, and 3.16 GHz, respectively. The L2 cache is a unified 6 MB per die (except for the X3320 with a smaller 3 MB L2 cache per die), and a front-side bus of 1333 MHz.
Bonne soirée