Chapter 2: Installation
2-5
Figure 2-2. Side and Top Views of DDR Installation
To Install:
Insert module vertically
and press down until it
snaps into place. The
release tabs should
close - if they do not
you should close them
yourself.
To Remove:
Use your thumbs to
gently push each re-
lease tab outward to
release the DIMM from
the slot.
Note the notch in the slot and on the bottom of the DIMM.
These prevent the DIMM from being installed incorrectly.
Support
The H8QC8(+)/H8QCE(+) 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).
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
With the mandatory four processors installed, it is better to spread out pairs of
DIMMs across all four CPU memory banks than fi lling up one CPU memory bank
while leaving any others empty. For example, if you were to install eight DIMMs
you should install two in the CPU1 DIMM slots, two in the CPU2 DIMM slots, two
in the CPU3 DIMM slots and two in the CPU4 DIMM slots (slots 1A and 1B in
each of the four banks) rather than four in any single CPU bank of four slots. If
you install four more, install two in the remaining CPU1 DIMM slots and two in the
the remaining CPU2 DIMM slots, etc. This balances the load over all CPUs to
optimize performance.
Maximum memory
: 64 GB for DDR333/266 and 32 GB for DDR400.
