Lenovo System x3950 X6 빠른 시작 매뉴얼 - 페이지 5

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Lenovo System x3950 X6에 대해서도 마찬가지입니다: 설치 매뉴얼 (50 페이지)

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Memory subsystem

The memory subsystem can operate in one of the following modes:

Independent (Performance) mode

Lockstep (RAS) mode

Performance

providing the ability to run two transactions at once. In

spread across both channels on an SMI is addressed simultaneously. Lockstep mode

provides higher memory frequency and memory reliability (Double Device Data Correction

+1 bit) but at the expense of higher memory bandwidth. Conversely, Independent mode

provides higher memory bandwidth at the cost of advanced memory RAS features and

memory frequency (Single Device Data Correction only).

Figure 4 shows the two memory modes.

Memory

buffer

DIMM

Figure 4 Memory modes: Performance mode (left) and RAS mode (right)

mode, each channel on an SMI is addressed independently, essentially

Memory performance mode

Intel Xeon processor

Memory

controller

Data 0

Memory

buffer

DIMM

Lockstep

SMI2

Data 1

links

Memory

buffer

DDR3

links

DIMM

Lenovo System x3850 X6 and x3950 X6 Quick Start Guide

mode, a pair of DIMMs

Memory RAS mode

Intel Xeon processor

Memory

controller

Memory

buffer

DIMM

Lockstep

Data

Memory

buffer

DIMM

channel