QuickSpecs

Please refer to the HP White Paper titled "Advanced Host Controller Interface (AHCI) and Redundant Array
of Independent Disks (RAID) on HP Compaq dc7900 Business PCs" at http://www.hp.com for more
information and instructions.
Ultra-slim Desktop
Maximum Memory * Supports up to 8 GB of DDR2 SYNCH DRAM using SO-DIMM modules. Slot 1 is black and must always be
populated. Not all memory configurations possible are represented below.
NOTE: For systems configured with more than 3 GB of memory and a 32-bit operating system, all memory
may not be available due to system resource requirements.
SO-DIMM Size Slot
Channel A Channel B
1 (black) 2 (white)
512-MB 512-MB
1-GB 1-GB
2-GB (dual-channel symmetric) 1-GB 1-GB
4-GB (dual channel symmetric) 2-GB 2-GB
8-GB maximum (dual channel symmetric) 4-GB 4-GB
* The Intel Q45 Express chipset includes a built-in Management Engine (ME), which allocates memory for manageability functions.
Management Engine memory is shared with system memory. If the PC contains a single SO-DIMM, 16 MB of memory is pre-allocated
for it at system startup. If the PC contains two SO-DIMMs, 32 MB of memory is pre-allocated. This memory is not made available to the
operating system, just as pre-allocated video memory is not available.
Small Form Factor and Convertible Minitower
Maximum Memory * Supports up to 16 GB of DDR2 SYNCH DRAM using DIMM modules. Slot 1 is black and must always be
populated. Not all memory configurations possible are represented below.
NOTE: For systems configured with more than 3 GB of memory and a 32-bit operating system, all
memory may not be available due to system resource requirements. Addressing memory above 4 GB
requires a 64-bit operating system.
QuickSpecs
HP Compaq dc7900 Business PC
Standard Features and Configurable Components
DA - 13029 Canada — Version 29 — March 7, 2011 Page 12