| Product  | 
 | 
| Model | 
HP Compaq dc7900 | 
| P/N | 
KP721AV | 
| C/O | 
Singapore | 
| Processor | 
 | 
| Processor | 
Intel® Core 2 Duo Processor | 
| Speed supported | 
E7500 - 2.93 GHz | 
| Cache size | 
3 Mb | 
| Data bus speed | 
1066 MHz | 
| Chipset | 
Intel Q45 Express chipset | 
| Memory  | 
 | 
| Installed Size | 
1024 MB | 
| Technology | 
DDR2 Synch DRAM PC2-6400 | 
| Bus | 
800 MHz | 
| Maximum allowed | 
Up to 16-GB DDR2 Synch Dram PC2-6400 (800-Mhz) Non ECC (4 x 4GB) | 
| Storage | 
 | 
| Hard Drive | 
250 GB Serial ATA 3.0-Gb/s Hard Drive (7200 rpm) | 
| Optical Storage | 
 | 
| Type | 
DVD-ROM | 
| Network Interface | 
 | 
| Ethernet | 
 Integrated Intel 82567LM GbE Network Connection  | 
| External media card | 
 | 
| Card Reader | 
 None  | 
| Expansion / Connectivity | 
 | 
| PCI | 
(1) PCI | 
 | 
(1) PCI Express x1 | 
 | 
(2) PCI Express x16 | 
| Memory Expansion | 
Four (4) DDR2 SDRAM DIMM slots (16 GB maximum memory support) | 
| Interfaces (Legacy) | 
 | 
| USB 2.0 | 
(2) front, (6) rear | 
| Serial | 
(1) Standard Optional 2nd port available | 
| Parallel | 
Optional (1) | 
| eSATA | 
Optional (1) | 
| PS/2 | 
(1) keyboard; (1) mouse | 
| DVI output | 
available via ADD2 card or optional DisplayPort to DVI adapterr | 
| Support for Multi-Monito | 
Dual monitor support standard; > 2 via ADD2 card or optional graphics cards | 
| Audio | 
Front – mic and headphone Rear – input (supports microphone or line input), line out | 
| NIC (RJ-45) | 
Integrated Intel 82567LM GbE Network Connection | 
| Graphics | 
 | 
| Video adapter | 
Intel Graphics Media Accelerator 4500 (integrated on chipset) | 
| Audio | 
 | 
| Audio | 
Integrated HD audio with AD1884A codec (all ports are stereo) | 
| Feature | 
Microphone and Headphone front ports | 
| Input Devices | 
 | 
| Keyboard | 
HP PS/2 Standard Keyboard | 
 | 
HP USB Standard Keyboard | 
 | 
HP USB Smartcard Keyboard | 
| Mouse | 
PS/2 2-Button Optical Scroll Mouse | 
 | 
USB 2-Button Optical Scroll Mouse | 
 | 
HP USB 2-Button Laser Scroll Mouse | 
| Software | 
 | 
| Operating System | 
Vista downgrade XP Pro | 
| Chassis | 
 | 
| Chassis design | 
Small Form Factor | 
| Power Supply | 
 | 
| Power | 
240W active PFC |