Hardware Upgrades
■contain the mandatory JEDEC SPD information In addition, the computer supports:
■128Mbit, 256Mbit, and 512Mbit
■
■DIMMs constructed with x8 and x16 DDR devices; DIMMs constructed with x4 SDRAM are not supported
Maximum operating speed is determined by a combination of the CPU and type of memory used. Refer to the table below for the optimum combination.
Maximum Front Side Bus Operating Speed (MHz)
CPU Front Side Bus | DDR266 | DDR333 | DDR400 |
(MHz) | DIMM | DIMM | DIMM |
|
|
|
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400 | 266 | 266 | 266 |
|
|
|
|
533 | 266 | 333 | 333 |
|
|
|
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800 (d248 only) | 266 | 320 | 400 |
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|
|
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✎The system will not start if you install unsupported DIMMs.
Single Channel and Dual Channel Modes
HP Compaq d228 and d230 Microtower models operate in single channel mode. HP Compaq d248 Microtower models will automatically operate in single channel mode or a
■In single channel mode, the maximum operational speed is determined by the slowest DIMM in the system. For example, if the system is populated with a DIMM that is 266 MHz and a second DIMM that is 333 MHz, the system will run at the slower of the two speeds.
■In dual channel mode (d248 models only), all DIMMs must be identically matched. DIMMs in the J23 and J24 sockets must be identical; DIMMs in the J25 and J28 sockets must also be
Hardware Reference Guide |
