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5-4 Sun Netra CP3220 Blade Server User’s Guide • January 2010
FIGURE 5-2 AMD Opteron Processors Block Diagram
5.3 Memory
The Sun Netra CP3220 blade server supports 1-Gbyte, 2-Gbyte, and 4-Gbyte
registered DDR2-667 memory, for up to 32 Gbytes memory total. When four DIMM
slots or less are populated, the DIMM clock rate will be set to the max clock rate of
up to 333 Mhz. When six or eight DIMMs slots are populated, the DIMM clock rate
will be set to a max clock rate of up to 267 Mhz.
The AMD Opteron’s processor’s memory controller works in 144-bit mode ECC
operation. For optimal performance, memory DIMMs must be installed in like pairs.
The controller supports 1 bit per byte ECC and supports DDR2 667 registered DRR
SDRAM modules. For more information on supported DIMM configurations, see
Section 2.3.6.1, “DIMM Requirements” on page 2-19.
Additional features of the Sun Netra CP3220 blade server’s memory architecture
include:
■ Dedicated onboard 128-bit wide DDR memory controller
■ Very low profile (0.72 inch) DIMM support
■ Memory bandwidth up to 5.3 Gbyte/sec
■ DDR2 power requirements 4.4W to 7.0W (1.8V)