System Memory Sizing And Publishing; Effects Of Memory Configuration On Memory Sizing - Intel S2600KPFR Product Specifications

Technical Product Specification
Processor Socket 1 = Populated
Total DIMM#
A1
X
X
3 DIMMs X
X
X
4 DIMMs
X
5 DIMMs X
6 DIMMs X
8 DIMMs X

4.5 System Memory Sizing and Publishing

The address space configured in a system depends on the amount of actual physical memory
installed, on the RAS configuration, and on the PCI/PCIe configuration. RAS configurations
reduce the memory space available in return for the RAS features. PCI/PCIe devices which
require address space for Memory Mapped IO (MMIO) with 32-bit or 64-bit addressing,
increase the address space in use, and introduce discontinuities in the correspondence
between physical memory and memory addresses.
The discontinuities in addressing physical memory revolve around the 4GB 32-bit addressing
limit. Since the system reserves memory address space just below the 4GB limit, and 32-bit
MMIO is allocated just below that, the addresses assigned to physical memory go up to the
bottom of the PCI allocations, then "jump" to above the 4GB limit into 64-bit space.
4.5.1

Effects of Memory Configuration on Memory Sizing

The system BIOS supports 4 memory configurations – Independent Channel Mode and 3
different RAS Modes. In some modes, memory reserved for RAS functions reduce the amount
of memory available.
Independent Channel Mode: In Independent Channel Mode, the amount of installed

physical memory is the amount of effective memory available. There is no reduction.
Lockstep Mode: For Lockstep Mode, the amount of installed physical memory is the

amount of effective memory available. There is no reduction. Lockstep Mode only
changes the addressing to address two channels in parallel.
Rank Sparing Mode: In Rank Sparing mode, the largest rank on each channel is

reserved as a spare rank for that channel. This reduces the available memory size by
the sum of the sizes of the reserved ranks.
Example: if a system has 2 16GB Quad Rank DIMMs on each of 4 channels on each of 2
processor sockets, the total installed memory will be (((2 * 16GB) * 4 channels) * 2 CPU
sockets) = 256GB.
Revision 1.37
Processor Socket 2 = Populated
B1 C1 D1
X X
X
X X X
X
X X X
X X X
X X X
E1 F1 G1
X
X
X X
X X
X
X X
X X X
Memory Support
Mirror Mode Support
H1
No
No
No
No
Yes
Yes
No
No
X Yes
45