SUPER MICRO Computer AS1021M-82, AS1021M-T2 Memory Support, Optimizing memory performance

AS1021M-T2/1021M-82 User's Manual

Memory Support

The H8DMR-i2/H8DMR-82 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 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 (two CPUs): 16 GB for DDR2-667/533, 32 GB for DDR2-400. If only one CPU is installed, maximum supported memory is halved (8 or 16 GB).

Figure 5-3a. Installing DIMM into Slot

Notch

Release

TabNote: Notch should align

with its receptive point on the slot

Notch

Release

Tab

To Install: Insert module vertically and press down until it snaps into place. Pay attention to

the bottom notch.

To Remove: Use your thumbs to gently push each release tab outward to free the DIMM from

the slot.

5-8