HP Compaq Business Desktop dx2000 Technical Information download pdf (Page 102)

E–2 359782-002 Service Reference Guide, dx2000 uT

Memory

DIMM Sockets

There are four DIMM sockets on the system board, with two sockets per channel. The sockets

are labeled XMM1, XMM2, XMM3, and XMM4. Sockets XMM1 and XMM2 operate in

memory channel A. Sockets XMM3 and XMM4 operate in memory channel B.

✎

The system board shown below may be slightly different from the one in the computer.

The system will automatically operate in single channel mode or a higher-performing dual

channel mode, depending on how the DIMMs are installed.

■ 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, the DIMM pairs must be identically matched. DIMMs in the XMM1

and XMM3 black sockets must be identical; DIMMs in the XMM2 and XMM4 blue sockets

must also be identical. Therefore, if you have one preinstalled DIMM in socket XMM1 and

are adding a second DIMM, it is recommended that you install an identical DIMM into the

XMM3 socket.

Item Description Socket Color

1 DIMM socket XMM1, Channel A Black

2 DIMM socket XMM2, Channel A Blue

3 DIMM socket XMM3, Channel B Black

4 DIMM socket XMM4, Channel B Blue

1 2 ... 97 98 99 100 101 102 103 104 105 106

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HP Compaq Business Desktop dx2000 Technical Information Page 102