NEC HX4500 manual Memory Dimm Configurations

Memory DIMM Configurations

The CPU base board contains sixteen 168-pin DIMM sockets for a total of up to 4 GB of system memory, using 256MB DIMMs. See Figure B-1. DIMM sockets on the board are organized as four 144-bit wide (122-bit wide data path with 16 parity bits) banks. Parity generation/checking is provided for each byte. DIMM sockets accept 168-pin single- or double-sided DIMMs. A bank must be populated using identical DIMMs. DIMMs may vary in size from one bank to the other, but all DIMMs must be the same speed. Timing requires 60 ns fast page devices.

A memory DIMM upgrade kit consists of 4 identical (of the same size and type) DIMMs defined as:

4 x 32MB DIMMS = 128MB

4 x 64MB DIMMs = 256MB

4 x 128MB DIMMs = 512MB

4 x 256MB DIMMs = 1GB.

The first bank of DIMMs should be installed in sockets P02, P03, P04 and P05. When you install additional DIMMs, you must start with bank 2 and continue to bank 4. When you remove DIMMs, you must start with the highest populated bank of DIMMs. Table B-1 lists the distribution of DIMMs for system memory configurations that maximize socket availability, other combinations are possible.

P02

P04

P14

P16

A

B

C

D

P03

P05

P15

P17

60 50

Figure B-1. CPU Base Board DIMM Sockets

B-2 Memory Configurations