HP Compaq dx6120 ST Hardware Reference Manual page 17

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