30 IBM System x3850 X6 and x3950 X6 Planning and Implementation Guide
Figure 2-21 and Figure 2-22 show the left and right sides of the Compute Book, respectively.
On the left side, there are one processor and 12 DIMM slots. On the right side, there are 12
DIMM slots for a total of 24 DIMMs per Compute Book.
Figure 2-21 The Compute Book’s left side
Figure 2-22 The Compute Book’s right side
The x3850 X6 supports up to four Compute Books, and the x3950 X6 supports up to eight
Compute Books. Supported configurations include these:
1, 2, or 4 Compute Books for the x3850 X6
2, 4, or 8 Compute Books for the x3950 X6
All Compute Books in a server must have the same processors.
2.4 Memory
The IBM System x3850 X6 and x3950 X6 support DDR3 memory with ECC protection.
The x3850 X6 supports up to 96 DIMMs when all processors are installed (24 DIMMs per
processor), and the x3950 X6 supports up to 192 DIMMs. The processor and the
corresponding memory DIMM slots are located on the Compute Book (see 2.3.2, “Compute
Books” on page 29).
Each processor has two integrated memory controllers, and each memory controller has two
Scalable Memory Interconnect generation 2 (SMI2) links that are connected to two scalable
memory buffers. Each memory buffer has two DDR3 channels, and each channel supports
three DIMMs, for a total of 24 DIMMs per processors.
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