HP Compaq DC5800

Processors

 * Intel Celeron 420 Processor (1.6-GHz, 512K L2 cache, 800-MHz FSB)
 * Intel Celeron 430 Processor (1.8-GHz, 512K L2 cache, 800-MHz FSB)


 * Intel Celeron Dual-Core E1200 Processor (1.6-GHz, 512K L2 cache, 800-MHz FSB)


 * Intel Pentium Dual-Core E2160 Processor (1.8-GHz, 1-MB L2 cache, 800-MHz FSB)
 * Intel Pentium Dual-Core E2180 Processor (2.0-GHz, 1-MB L2 cache, 800-MHz FSB)
 * Intel Pentium Dual-Core E2200 Processor (2.2-GHz, 1-MB L2 cache, 800-MHz FSB)


 * Intel Core 2 Duo E4500 Processor (2.20-GHz, 2 MB L2 cache, 800-MHz FSB)
 * Intel Core 2 Duo E4600 Processor (2.40-GHz, 2 MB L2 cache, 800-MHz FSB)
 * Intel Core 2 Duo E6550 Processor (2.33-GHz, 4 MB L2 cache, 1333-MHz FSB)
 * Intel Core 2 Duo E6750 Processor (2.66-GHz, 4 MB L2 cache, 1333-MHz FSB)
 * Intel Core 2 Duo E8200 Processor (2.66-GHz, 6 MB L2 cache, 1333-MHz FSB)
 * Intel Core 2 Duo E8300 Processor (2.83-GHz, 6 MB L2 cache, 1333-MHz FSB)
 * Intel Core 2 Duo E8400 Processor (3.0-GHz, 6 MB L2 cache, 1333-MHz FSB)
 * Intel Core 2 Quad Q9300 Processor (2.50-GHz, 6 MB L2 cache, 1333-MHz FSB)

Chipset

 * Intel Q33 Express chipset

Memory
NOTE: Windows Vista for most editions need 1GB of RAM or higher, If you want a Windows Vista computer with 512MB of RAM, get the one with Windows Vista Home Basic, because Windows Vista Home Basic needs 512MB of RAM or higher.
 * 512-MB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (1 x 512)
 * 1-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (1 x 1GB)
 * 1-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (2 x 512)
 * 2-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (1 x 2GB)
 * 2-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (2 x 1GB)
 * 2-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (4 x 512)
 * 3-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (3 x 1GB)
 * 4-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (4 x 1GB)
 * 4-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (2 x 2GB)
 * 8-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (4 x 2GB)

Hard Drive

 * 80-GB SATA 3.0-Gb/s Hard Drive (8MB Cache, 7200 RPM, NCQ, Smart IV)
 * 160-GB SATA 3.0-Gb/s Hard Drive (8MB Cache, 7200 RPM, NCQ, Smart IV)
 * 250-GB SATA 3.0-Gb/s Hard Drive (8MB Cache, 7200 RPM, NCQ, Smart IV)
 * 500-GB SATA 3.0-Gb/s Hard Drive (16MB Cache, 7200 RPM, NCQ, Smart IV)
 * 80-GB SATA 3.0-Gb/s Hard Drive (16MB Cache,10,000 RPM, NCQ, Smart III)
 * 160-GB SATA 3.0-Gb/s Hard Drive (16MB Cache, 10,000 RPM, NCQ, Smart III)
 * 3.5” Removable 80-GB SATA 3.0 Gb/s Hard Drive (8MB Cache, 7200 RPM, NCQ, Smart IV)
 * 3.5” Removable 160-GB SATA 3.0 Gb/s Hard Drive (8MB Cache, 7200 RPM, NCQ, Smart IV)
 * 3.5” Removable 250-GB SATA 3.0 Gb/s Hard Drive (8MB Cache, 7200 RPM, NCQ, Smart IV)
 * 2nd hard drive, 80-GB SATA 3.0-Gb/s Hard Drive (8MB Cache, 7200 RPM, NCQ, Smart IV)
 * 2nd hard drive, 250-GB SATA 3.0-Gb/s Hard Drive (8MB Cache, 7200 RPM, NCQ, Smart IV)
 * 2nd hard drive, 500-GB SATA 3.0-Gb/s Hard Drive (16MB Cache, 7200 RPM, NCQ, Smart IV)

Diskette Drives

 * 1.44-MB Diskette Drive

Media Reader

 * HP 16-in-1 Media Reader (USB connection on the system board)

Optical Drives

 * SATA DVD-ROM Drive
 * SATA CD-RW/DVD-ROM Combo Drive
 * SATA SuperMulti LightScribe DVD Writer Drive

Media Card Reader

 * HP 16-in-1 3.5” Media Card Reader

Security

 * Integrated 1.2 TPM Embedded Security Chip
 * HP Desktop Security lock kit (lock and cable)
 * Security cable with Kensington lock X X
 * HP ProtectTools security software suite

NIC

 * Intel 82566DM Gigabit Network Connection (integrated on system board)
 * Broadcom NetXtreme Gigabit Ethernet PCIe NIC Card
 * Intel PRO/1000 PT PCIe Gigabit NIC

Wireless

 * Wireless A+G PCI Card (full height bracket) (not supported on SFF models)
 * Wireless A+G PCI Card (low profile bracket) (not supported on MT models)

Modem

 * 2006 Agere PCI 56K International SoftModem (full height) (not supported on SFF models)
 * 2006 Agere PCI 56K International SoftModem (low profile) (not supported on MT models)

Graphics

 * Integrated Intel Graphics Media Accelerator 3100
 * HP ADD2 SDVO PCIe DVI-D adapter
 * HP ADD2 SDVO PCIe VGA/TV-Out Adapter
 * NVIDIA Quadro NVS 290 256MB DH PCIe x16 Graphics Card
 * NVIDIA GeForce 8400 GS 256MB DH PCIe x1 Graphics Card
 * NVIDIA GeForce 8400 GS 256MB SH PCIe x16 Graphics Card
 * ATI Radeon HD 2400 XT 256MB DH PCIe x16 Graphics Card

Audio

 * Integrated High Definition audio with ADI1884 codec (all ports are stereo)
 * Microphone and Headphone front ports
 * Line-out and Line-In rear ports
 * Multistreaming capable
 * Internal Speaker

Miscellaneous

 * HP FireWire / IEEE 1394 PCI Card (full height) (not supported on SFF models)
 * HP FireWire / IEEE 1394 PCI Card (low profile) (not supported on MT models)
 * 2nd serial port adapter (not supported on SFF models)
 * 2nd serial port adapter (low profile) (not supported on MT models)
 * Tower stand (not available for MT models)
 * 1-GB Flash Module for Vista ReadyBoost (not supported on SFF models)

Operating System

 * Genuine Windows Vista Business 32-bit
 * Genuine Windows Vista Business 64-bit
 * Genuine Windows Vista Home Basic 32-bit
 * Genuine Windows Vista Ultimate 32-bit
 * Genuine Windows Vista Business 32-bit with downgrade to XP Professional preinstalled
 * FreeDOS

Source
http://static.highspeedbackbone.net/pdf/HP_dc5800_Specs.pdf