Lenovo ThinkSystem SR645 Setup Manual page 104

Table 23. Memory slot and channel identification
Channel D0
D1
16 15
Slot number
32 31
Rules you need to follow when installing or replacing a DIMM.
• Slot:
– When a data bus daisy chain topology is used: populate DIMMs from farthest slot (slot 1) to closest
slot (slot 0) to the processor on a per-channel basis.
– When a data bus balanced tee route topology is used: populate DIMMs in either slot on a per-
channel basis.
Table 24. DIMM installation sequence
Number of processor
With one processor
With two processors
• Capacity:
DIMMs with different capacities (only two different capacities) can be mixed, install the one with the
highest capacity first.
• Rank:
DIMMs with different ranks can be mixed, install the one with the highest rank first.
• Frequency:
DIMMs with different frequencies can be mixed in the same channel.
• Voltage:
DIMMs with different operating voltage cannot be mixed. (The only supported DIMM voltage is 1.2V.)
• ECC/Non-ECC:
ECC and non-ECC DIMM cannot be mixed. (Non-ECC DIMM is not supported for the server.)
• DRAM:
x4 and x8 DRAM based DIMMs can be mixed, but not in the same channel.
• Type:
DIMMs of different base module types can be mixed, but not in the same channel.
• Vendor:
DIMMs from different vendors can be mixed in the same channel.
ThinkSystem SR645 Setup Guide
100
C1 C0 B0
B1 A1
14 13 12 11 10
30 29 28 27 26
Slot sequence
14, 16, 3, 1, 10, 12, 7, 5, 13, 15, 4, 2, 9, 11, 8, 6
14, 30, 16, 32, 3, 19, 1, 17, 10, 26, 12, 28, 7, 23, 5, 21, 13, 29, 15, 31, 4, 20, 2,
18, 9, 25, 11, 27, 8, 24, 6, 22
A0 E0 F0
E1
9 8 7 6
25 24 23 22
G0 G1 H0
F1
5 4 3 2
21 20 19 18
H1
1
17