User`s manual

Chapter 2: Installation
2-5
2-4 Installing Memory
CAUTION
Exercise extreme care when installing or removing memory modules
to prevent any possible damage.
1. Insert each memory module vertically into its slot, paying attention to the notch
along the bottom of the module to prevent inserting the module incorrectly (see
Figure 2-2). See support information below.
2. Gently press down on the memory module until it snaps into place.
Notes: each processor has its own built-in memory controller, so CPU2 DIMMs
cannot be addressed if only a single CPU is installed. 128 MB, 256 MB, 512 MB,
1 GB, 2 GB* and 4 GB* memory modules are supported.
*With Opteron 246 C-stepping CPUs and above.
It is highly recommended that you remove the power cord from the system before
installing or changing any memory modules.
Support
The H8DSL-HTi supports single or dual-channel, registered ECC DDR400/333/266
SDRAM.
Both interleaved and non-interleaved memory are supported, so you may populate
any number of DIMM slots (see note on previous page and charts on following
page). The CPU2 DIMM slots can only be accessed when two CPUs are installed
(however, the CPU2 DIMM slots are not required to be populated when two CPUs
are installed).
Populating two adjacent slots at a time with memory modules of the same size and
type will result in interleaved (128-bit) memory, which is faster than non-interleaved
(64-bit) memory.
Optimizing memory performance
If two processors are installed, it is better to stagger pairs of DIMMs across both
sets of CPU DIMM slots, e.g. fi rst populate CPU1 slots 1A and 1B, then CPU2 slots
1A, and 1B, then the next two CPU1 slots, etc. This balances the load over both
CPUs to optimize performance. See chart on page 2-7.
Maximum memory (two CPUs): 32 GB for DDR333/266 and 16 GB for DDR400.
If only one CPU is installed, maximum supported memory is halved (16 GB for
DDR333/266 and 8 GB for DDR400).