> IBM Memory > IBM eServer xSeries Server Memory
Memory Upgrade for IBM eServer xSeries 255 8685
IBM eServer xSeries 255 8685 memory upgrade specification, eServer xSeries 255 8685 maximum memory, memory speed, and memory upgrade options.
Upgrade memory on IBM eServer xSeries 255 8685 upto a maximum of 24GB
PC2700 Registered ECC DDR SDRAM DIMMs, with maximum per slot in 12 (6 banks of 2) memory slots. The IBM eServer xSeries 255 8685 takes the PC2700 Registered ECC DDR SDRAM DIMMs Memory Type.
| IBM eServer xSeries 255 8685 Memory Upgrade Specification | ||||
|---|---|---|---|---|
| Standard Memory | Maximum Memory | Memory Expansion | CPU Type | Model/Chipset |
| 512 MB or 1.0 GB (Removable) | 24GB PC2700 Registered ECC DDR SDRAM DIMMs |
12 sockets (6 banks of 2) | Intel Xeon MP / 400MHz FSB, ServerWorks Grand Champion HE Chipset | |
IBM eServer xSeries 255 8685 Memory Upgrade options.
What are memory sockets or slots and how are these divided into bank?
Memory Sockets or Slots are the place where memory RAM modules are inserted in the motherboard. The IBM eServer xSeries 255 8685 has 12 (6 banks of 2) memory expansion slots. A memory bank is a group of memory expansion sockets, a bank must be completely filled with memory modules of the same size and type in order for the system to recognize and address the memory. i.e. :
2 sockets (2 banks of 1) This indicates that there are 2 memory slots. These are divided into 2 banks, and each bank consists of one memory slot. So you can add memory one piece at a time for the system to use.
3 sockets (3 banks of 1) This indicates that there are 3 memory slots. These are divided into 3 banks, and each bank consists of one memory slot. So you can add memory one piece at a time for the system to use.
4 sockets (2 banks of 2) This indicates that there are 4 memory slots. These are divided into 2 banks, and each bank consists of two memory slots. So you must add memory two pieces at a time (they must be the same size and type of memory) in order for the system to benefit from the upgrade.
8 sockets (4 banks of 2) This indicates that there are 8 memory slots. These are divided into 4 banks, and each bank consists of two memory slots. So you must add memory two pieces at a time (they must be the same size and type of memory) in order for the system to benefit from the upgrade.
12 sockets (3 banks of 4) This indicates that there are 12 memory slots. These are divided into 3 banks, and each bank consists of four memory slots. So you must add memory four pieces at a time (and they must be the same size and type of memory) in order for the system to benefit from the upgrade.
