i just got a 450mhz g4 powermac with a 1gig of ram. i am wanting to upgrade to a dual 500mhz cpu would this work with my system, http://cgi.ebay.com/DUAL-500MHz-G4-CPU-Gigabit-Ethernet-COMPLETE-w-Heatsink_W0QQitemZ190247602689QQcmdZViewItem?hash=item190247602689&_trkparms=72%3A552|39%3A1|66%3A2|65%3A12|240%3A1318&_trksid=p3286.c0.m14