X8400
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PC3200 DDR1 ECC DIMMs
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Use 2.5V
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Support 1-Gbyte, 2-Gbyte, and 4-Gbyte capacity per DIMM
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Support 4 DIMMs maximum per CPU, 16 DIMMs maximum per blade
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Support 64 Gbytes maximum memory per blade
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Built with double-data-rate synchronous dynamic random access memory (DDR SDRAM)
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Operate at 400-MHz
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X8420
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PC2-5300P DDR2 ECC DIMMs
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Use 1.8V
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Support 1-Gbyte, 2-Gbyte, and 4-Gbyte capacity per DIMM
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Support 4 DIMMs maximum per CPU, 16 DIMMs maximum per blade
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Support 64 Gbytes maximum memory per blade
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Built with double-data-rate two synchronous dynamic random access memory (DDR2 SDRAM)
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Operate at 667-MHz
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X8440
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PC2-5300P DDR2 ECC DIMMs
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Use 1.8V
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Support 1-Gbyte, 2-Gbyte, and 4-Gbyte capacity per DIMM
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Support 8 DIMMs maximum per CPU, 32 DIMMs maximum per blade (4 CPU configuration)
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Support 8 DIMMs maximum per CPU, 16 DIMMs maximum per blade (2 CPU configuration)
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Support 128 Gbytes maximum memory per blade (4 CPU configuration)
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Support 64 Gbytes maximum memory per blade (2 CPU configuration)
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Built with double-data-rate two synchronous dynamic random access memory (DDR2 SDRAM)
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Operate at 667-MHz
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X8450
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PC2-5300 ECC FBDIMMs
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667 MHz
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1-Gbyte, 2-Gbyte, 4-Gbyte capacity per FBDIMM
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32 FB-DIMMs maximum per blade
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128 Gbytes max memory per blade
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