Memory
| Internal memory |
4 GB |
| Internal memory type |
DDR2 |
| Memory clock speed |
667 MHz |
| ECC |
Y |
| Memory layout (modules x size) |
2 x 2 GB |
PC2-5300 - 667 MHz
The vendors who supply DIMMs to IBM stopped building PC2-4200 and PC2-3200 DIMMs in the first half of 2007. At that time, IBM qualified the usage of the newer PC2-5300 DIMMs with JS21 blades. When the PC2-5300 DIMMs are inserted into JS21 blades, the system firmware will only run the DIMMs at 533MHz, even if the PC2-5300 DIMM labels show 667 MHz. Thus, the PC2-5300 DIMMs are supported on JS21 blades.