Supero AS-4021M-32R User Manual page 42

AS4021M-32R User's Manual
Support
The H8DM3-2 supports single or dual-channel, DDR2-667/533/400 registered ECC
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. See charts on following page.
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.
Maximum memory: 32 GB of registered ECC DDR2-667/533/400. If only one CPU
is installed, maximum supported memory is halved.
To Install: Insert module vertically and press down until it snaps into place. Pay attention to the bottom
notches.
To Remove: Use your thumbs to gently push each release tab outward to free the DIMM from the
slot.
Figure 5-5. Installing DIMM into Slot
Notch
Release
Note: Notch
Tab
should align
with its
receptive point
on the slot
5-8
Notch
Release
Tab