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Intel
®
Server Board S5000PAL / S5000XAL TPS Functional Architecture
Revision 1.4
Intel order number: D31979-007
27
Heatsink assembly
Thermal interface material (TIM)
Server board
CEK spring
Chassis
Figure 10. CEK Processor Mounting
3.1.3 Memory Sub-system
On the Intel
®
Server Board S5000PAL / S5000XAL, the MCH provides four channels of Fully Buffered
DIMM (FB-DIMM) memory. Each channel can support up to 2 Dual Ranked FB-DIMM DDR2 DIMMs. FB-
DIMM memory channels are organized in to two branches for support of RAID 1 (mirroring). The MCH
can support up to 8 DIMMs or a maximum memory size of 32 GB physical memory in non-mirrored mode
and 16 GB physical memory in a mirrored configuration. The read bandwidth for each FB-DIMM channel
is 4.25 GB/s for DDR2 533 FB-DIMM memory which gives a total read bandwidth of 17 GB/s for four FB-
DIMM channels. Thus, this provides 8.5 GB/s of write memory bandwidth for four FB-DIMM channels.
The read bandwidth for each FB-DIMM channel is 5.3GB/s for DDR2 667 FB-DIMM memory which gives
a total read bandwidth of 21GB/s for four FB-DIMM channels. Thus, this provides 10.7 GB/s of write
memory bandwidth for four FB-DIMM channels. The total bandwidth is based on read bandwidth thus the
total bandwidth is 17 GB/s for 533 and 21.0 GB/s for 667.
On the Intel
®
Server Board S5000PAL / S5000XAL, a pair of channels becomes a branch where Branch
0 consists of channels A and B, and Branch 1 consists of channels C and D. FBD memory channels are
organized into two branches for support of RAID 1(mirroring).
TP02299
DIMM D2
DIMM D1
DIMM C2
DIMM C1
DIMM B2
DIMM B1
DIMM A2
DIMM A1
Branch 0
MCH
Channel A
Channel B
Channel D
Channel C
Branch 1
Figure 11. Memory Layout