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
Ultra-slim DesktopUltra-slim Desktop
Ultra-slim Desktop
Maximum Memory
Maximum MemoryMaximum Memory
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:
NOTE:NOTE:
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
SO-DIMM SizeSO-DIMM Size
SO-DIMM Size
Slot
SlotSlot
Slot
Channel A
Channel AChannel A
Channel A
Channel B
Channel BChannel B
Channel B
1
11
1
(black)
2
22
2
(white)
512-MB
512-MB512-MB
512-MB
512-MB
1-GB
1-GB1-GB
1-GB 1-GB
2-GB
2-GB2-GB
2-GB
(dual-channel symmetric)
1-GB 1-GB
4-GB
4-GB4-GB
4-GB
(dual channel symmetric)
2-GB 2-GB
8-GB maximum
8-GB maximum8-GB maximum
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
Small Form Factor and Convertible MinitowerSmall Form Factor and Convertible Minitower
Small Form Factor and Convertible Minitower
Maximum Memory
Maximum MemoryMaximum Memory
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:
NOTE:NOTE:
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.
DIMM Size
DIMM SizeDIMM Size
DIMM Size
Slot
SlotSlot
Slot
Channel A
Channel AChannel A
Channel A
Channel B
Channel BChannel B
Channel B
1
11
1
(black)
2
22
2
(white)
3
33
3
(white)
4
44
4
(white)
512-MB
512-MB512-MB
512-MB
512-MB
1-GB
1-GB1-GB
1-GB 1-GB
2-GB
2-GB2-GB
2-GB
(dual-channel
symmetric)
1-GB
1-GB
4-GB
4-GB4-GB
4-GB
(dual-channel
symmetric)
1-GB 1-GB 1-GB 1-GB
8-GB
8-GB8-GB
8-GB
(dual-channel
symmetric)
2-GB 2-GB 2-GB 2-GB
16-GB maximum
16-GB maximum16-GB maximum
16-GB maximum
(dual-channel symmetric)
4-GB 4-GB 4-GB 4-GB
QuickSpecs
HP Compaq dc7900 Business PC
HP Compaq dc7900 Business PCHP Compaq dc7900 Business PC
HP Compaq dc7900 Business PC
Standard Features and Configurable Components
DA - 13029 North America — Version 15 — March 30, 2009
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