HP d260 Business Desktop d260 Series, Service Reference Guide, First Edition - Page 100
Maximum Memory Bus Speed MHz, Front-Side Bus, PCI 2100 DIMM, PCI 2700 DIMM, PCI 3200 DIMM
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Maximum operating speed is determined by a combination of the CPU and the type of memory used. Refer to the table below for the optimum combination. Front-Side Bus (MHz) 400 533 800* *Select models only. Maximum Memory Bus Speed (MHz) PCI 2100 DIMM 266 266 266 PCI 2700 DIMM 266 333 320 PCI 3200 DIMM 266 333 400 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, all DIMMs must be identically matched. DIMMs in the J23 and J24 (Channel A) sockets must be identical; DIMMs in the J25 and J28 (Channel B) sockets must also be identical. Therefore, if you have one preinstalled DIMM in J23 and are adding a second DIMM, it is recommended that you install an identical DIMM into the J25 socket for optimum, dual-channel performance. ✎ If you are populating all four memory sockets in dual channel mode, you must use four identical DIMMs for dual channel performance. The system will automatically operate in single channel mode or a higher-performing dual channel mode, depending on how the DIMMs are installed. E-2 377977-AA1 Service Reference Guide, d260