this is what the specs say:
DELL PE2850 Processor: 2 #Processors 1 #Cores per Proc
Dell Memory: 12 GB Memory
Hard Drive: 146 GB Hard Drive 10000 HDD RPM
Hard Drive: 15000 HDD RPM 146 GB Hard Drive
i started with 4, then doubled to 8.... and the last time i added 4 more