H8QM8-2/H8QME-2 User's Manual
Support
The H8QM8-2/H8QME-2 supports single or dual-channel, registered ECC DDR2- 667/533/400 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.
Optimizing memory performance
It is better to spread pairs of DIMMs across all memory banks with a CPU installed than to fill up one CPU memory bank while leaving another empty. For example, if you were to install eight DIMMs in a quad-CPU configuration, you should install two in the CPU1 DIMM slots (slots 1A and 1B) , two in the CPU2 DIMM slots, two in the CPU3 DIMM slots and two in the CPU4 DIMM 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 dual-CPU configuration, memory can only be installed in the banks associated with CPU#1 and CPU#2.
Maximum memory: 128 GB DDR2-667/533/400 registered ECC SDRAM (256 GB for 8-way configuration). In a dual-CPU configuration, memory support is halved.
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.
Note: Notch should align with its receptive point on the slot
Note the notch in the slot and on the bottom of the DIMM.
These prevent the DIMM from being installed incorrectly.
To Remove:
Use your thumbs to gently push each re- lease tab outward to release the DIMM from the slot.
