DELL PE2950 III 2U RACK Quad Core Xeon E5420 2.5GHz(2×6MB cache 1333MHz FSB), 4GB FB 667MHz (2 × 2GB dual rank) RAM, FDD, DVD/CD-RW, 1×8 Backplane 2.5", 2 × 73GB 15K SAS HDD, PERC 6/i RAID 256MB cache (SATA or SAS Hot-Plug HDD), 2x PCIe x8 and 1x PCIe x4, 2×1Gb NIC, 1 × 750W PSU NBD

• Processor: x1 (up to x2) Intel Xeon 5440 2,83GHz/1333MHz Cache Memory
• Storage Controller: PERC 6i 256Mb BBWC(RAID 0/1/5/6/10/50/60)
• Hard Drive: None, up to 2x3.5” SAS or SATA
• Internal Storage: Up to 1.5TB via two 3.5” 750GB SATA

• Processor: x1 (up to x2) Intel Xeon 5420 2,5GHz/1333MHz Cache Memory
• Storage Controller: PERC 6i 256Mb DDWC(RAID 0/1/5/6/10/50/60)
• Hard Drive: None, up to 4x2.5” SAS or 2x2.5” SATA
• Internal Storage: Up to 300MB via four 2.5” 73GB SAS

• Processor: x1 (up to x2) Intel Xeon 5430 2,66GHz/1333MHz Cache Memory
• Storage Controller: PERC 6i 256Mb BBWC (RAID 0/1/5/6/10/50/60)
• Hard Drive: None, up to 2×3.5” SAS or SATA
• Internal Storage: Up to 1.5TB via two 3.5” 750GB SATA

DELL PE2900 III Tower Quad Core Xeon E5420 2.5GHz(2×6MB cache 1333MHz FSB) no RAM FDD DVD/CD-RW 1×8 Backplane 3.5" & 1×2 Flex Bay no HDD PERC 6/i RAID 256MB cache (SATA or SAS Hot-Plug HDD) 1x PCIe x8 and 3x PCIe x4 and 2x PCI-X 2×1Gb NIC 1 × 930W PSU