Lenovo System x3850 X6 Panduan Memulai Cepat - Halaman 5

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Memory subsystem

The memory subsystem can operate in one of the following modes:
Independent (Performance) mode
Lockstep (RAS) mode
Performance
In
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
DIMM
DIMM
DIMM
DIMM
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
Memory
controller
controller
Data 0
Memory
Memory
buffer
buffer
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
Lockstep
SMI2
Data 1
links
Memory
Memory
buffer
buffer
DDR3
links
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
Lenovo System x3850 X6 and x3950 X6 Quick Start Guide
mode, a pair of DIMMs
Memory RAS mode
Intel Xeon processor
Memory
Memory
controller
controller
Memory
Memory
buffer
buffer
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
DIMM
Lockstep
Data
Memory
buffer
DIMM
DIMM
DIMM
channel
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