SUPER MICRO Computer Super H8QM3-2 - Manual (Page 23)

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: Notch
should align
with its
receptive point
on the slot
Notch Notch
Release
Tab
Release
Tab
Note the notch in the slot and on the bottom of the DIMM.
These prevent the DIMM from being installed incorrectly.
Support
The H8QM3-2/H8QMi-2 supports single or dual-channel, registered ECC DDR2-
800/667/533 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 inter-
leaved (128-bit) memory, which is faster than non-interleaved (64-bit) memory. Note
that when slots are fully populated with DDR2-800 or DDR2-667 DIMMs, memory
will run at 533 MHz due to a chipset limitation.
Optimizing memory performance
It's better to spread pairs of DIMMs across all memory banks with a CPU installed
than to fi ll up one CPU memory bank while leaving another empty. For example, if
you were to install eight DIMMs in a quad-CPU confi guration, you should install two
in the CPU1 DIMM slots (slots 1A and 1B), two in the CPU2 DIMM slots, two in the
CPU3 slots and two in the CPU4 slots rather than four in any two CPU DIMM 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. In a single or dual-CPU confi guration, memory can only be
installed in the slots associated with CPU#1 or CPU#1 and CPU#2, respectively.
Maximum memory: 256 GB of DDR2-800/667/533. (Dual-CPU confi guration: 128
GB maximum, single-CPU confi guration: 64 GB maximum.)