Compaq dc7800 manual DDR2 Synch Dram NON-ECC Memory

QuickSpecs

HP Compaq dc7800 Business PC

Standard Features and Configurable Components

Memory	DDR2 SYNCH DRAM NON-ECC MEMORY
	Memory upgrades are accomplished by adding single or multiple DIMMs of the same or varied
	sizes. This chart does not represent all possible memory configurations. The Intel Q35 Express
	chipsets support non-ECC DDR2 PC2-5300 (667-MHz) and PC2-6400 (800-MHz) memory.
	CAUTION: You must shut down the computer and disconnect the power cord before adding or
	removing memory modules. Regardless of the power-on state, voltage is always supplied to the
	memory modules as long as the computer is plugged in to an active AC outlet. Adding or removing
	memory modules while voltage is present may cause irreparable damage to the memory modules
	or system board.
	HP recommends dual-channel symmetric configurations for maximum performance.
	For best performance, add the same amount of total memory to each channel and do not mix
	speeds. For dual-channel symmetric performance, the total amount of memory in each channel
	must be equal. If speeds are mixed, speed will default to the slowest DIMM.

Ultra-slim Desktop

Maximum Memory* Supports up to 4 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.

SO-DIMM Size		Slot
	Channel A		Channel B
	1 (black)		2 (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
4-GB maximum (dual channel	2-GB		2-GB
symmetric)

*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 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 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.

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