Intel S5000PALR User Guide - Page 29

Memory The server board provides eight DIMM sockets across two branches, and each branch has two channels. Channel A consists of slots A1 and A2; channel B consists of slots B1 and B2; channel C consists of slots C1 and C2; and channel D consists of slots D1 and D2. Channel A Channel C Channel B Channel D DIMM D2 Socket DIMM D1 Socket DIMM C2 Socket DIMM C1 Socket DIMM B2 Socket DIMM B1 Socket DIMM A2 Socket DIMM A1 Socket Branch 0 Branch 1 TP02325 Figure 7. DIMM Configuration Diagram DIMMs must be populated in pairs across consecutive channels starting with the lowest numbered slot in each channel. Slots A1 and B1 are paired, followed by slots C1 and D1. For performance reasons, when configuring four DIMMs, DIMM pairs A2 and B2 should never be populated before DIMM pair C1 and D1. A four DIMM configuration should be populated as A1 and B1; C1 and D1. See Figure 8 for a four DIMM configuration example. Intel® Server Board S5000PAL User's Guide 11