HP Dc7900 Technical Reference Guide: HP Compaq dc7900 Series Business Desktop - Page 19
Table 2-1, Feature Difference Matrix by Form Factor - pci serial port
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System Overview Table 2-1 shows the differences in features between the different PC series based on form factor: Table 2-1 Feature Difference Matrix by Form Factor USDT SFF CMT Processor types supported Intel Celeron, Pentium dual-core, Core 2 Duo Intel Celeron, Pentium dual-core, Core 2 Duo, Core 2 Quad Intel Celeron, Pentium dual-core, Core 2 Duo, Core 2 Quad Processor wattage (max) 65 W 95 W 95 W Memory: # & type of sockets Maximum memory 2 SODIMM 8 GB 4 DIMM 16 GB 4 DIMM 16 GB Serial ports 0 1 std., 1 opt. [1] 1 std., 1 opt. [1] Parallel ports 0 optional optional Drive bays: Externally accessible 1 2 4 Internal 1 1 2 Drive types supported 1 HDD, 1 slimline ODD 2 HDDs, 1ODD, RAID1 2 HDDs, 2 ODDs, RAID1 PCIe slots: x16 graphics (PCIe 2.0) 0 1 [3, 4] 1 x1 connector 1 [2] 1 [3] 1 x4 (x16 connector) 1 [3, 4] 1 PCI 2.3 32-bit 5-V slots 0 1 half-height 3 or full-height 2 full-height [5] Power Supply Unit: Module type power rating external 135-watt internal 240-watt internal 365-watt NOTES: [1] 2nd serial port requires optional cable/bracket assembly. [2] PCIe Mini Card slot. [3] Supports low-profile card in standard configuration. Not accessible if PCI riser card field option is installed. [4] Accepts low-profile PCIe card: height = 2.5 in., length = 6.6 in. [5] Full-height PCI slots require installation of PCI riser card field option (full-height dimensions: height = 4.2 in., length = 6.875 in). Technical Reference Guide www.hp.com 2-3