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Open Box: SoNNeT G4 Duet Dual Processor upgrade card for Power Mac G4s with AGP Graphics Model SG4D-1300-2M - Newegg.com
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For some reason, I kept the G4 Processor Card from my PowerMac G4 MDD. Dual 1.25GHz (2002) : r/VintageApple
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Amazon.com: HP Heatsink Bundle with Xeon Silver 4214 Processor (5YZ32AT) 2.2GHz, 12-Core, 24-Threads, 16.5MB Cache, LGA 3647, 85 W, 2nd CPU Compatible with HP Z8 G4 : Electronics
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