HP dx2358 - Microtower PC Hardware Reference Manual page 17

Hardware Reference Guide
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.
DIMM Socket Locations
Item
DIMM socket XMM1, Channel A
1
DIMM socket XMM2, Channel B
2
DIMM socket XMM3, Channel A
3
DIMM socket XMM4, Channel B
4
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Description
Hardware Upgrades
Socket Color
White
White
Black
Black
2–7