HP Compaq dc7800 - Page 11

Small Form Factor and Convertible Minitower
Maximum Memory* Supports up to 8 GB of DDR2 SYNCH DRAM. 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.
DIMM Size Slot
Channel A Channel B
1 (black) 2 (white) 3 (white) 4 (white)
512-MB 512-MB
1-GB 1-GB
1-GB (dual-channel
symmetric)
512-MB 512-MB
2-GB (dual-channel
symmetric)
1-GB 1-GB
2-GB (dual-channel
symmetric)
512-MB 512-MB 512-MB 512-MB
4-GB (dual-channel
symmetric)
1-GB 1-GB 1-GB 1-GB
8-GB maximum
(dual-channel symmetric)
2-GB 2-GB 2-GB 2-GB
* The Intel Q35 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 DIMM, 16 MB of memory is pre-allocated for it
at system startup. If the PC contains two 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.
Memory Configurations –
One of the following*
USDT SFF CMT
512-MB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (1 x 512) X X X
1-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (1 x 1GB) X X X
1-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (2 x 512) X X X
2-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (1 x 2GB) X X X
2-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (2 x 1GB) X X X
2-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (4 x 512) X X
3-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (3 x 1GB) X X
4-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (4 x 1GB) X X
4-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (2 x 2GB) X X X
8-GB DDR2 Synch Dram PC2-6400 (800-MHz) Non ECC (4 x 2GB) X X
512-MB DDR2 Synch Dram PC2-5300 (667-MHz) Non ECC (1 x 512) X X X
1-GB DDR2 Synch Dram PC2-5300 (667-MHz) Non ECC (1 x 1GB) X X X
1-GB DDR2 Synch Dram PC2-5300 (667-MHz) Non ECC (2 x 512) X X X
2-GB DDR2 Synch Dram PC2-5300 (667-MHz) Non ECC (1 x 2GB) X X X
QuickSpecs
HP Compaq dc7800 Business PC
Standard Features and Configurable Components
DA - 12744 North America — Version 33 — October 29, 2008 Page 11