Gateway Tower User Manual page 295

If your system board has dual-channel memory, fill the
memory slot AND the
DIMMs. Matching DIMMs are the same size, density, and technology.
When adding memory, fill the
memory slot with matching DIMMs.
Channel B/DIMM 1
memory slot with matching
Channel B/DIMM 0
Channel A/DIMM 1
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Installing memory
Channel A/DIMM 0
memory slot AND the
Channel A/DIMM 0
Channel A/DIMM 1
Channel B/DIMM 0
Channel B/DIMM 1
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