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Registered (also informally called buffered) memory modules have a register between the SDRAM modules and the system's memory controller. They place less electrical load on the memory controller and allow single systems to remain stable with more memory modules than they would have otherwise. Registered memory is more expensive because of the additional components, so it is usually found only in applications where the need for scalability and stability outweighs the need for a low price (servers, for example). Although most server-grade memory modules are both ECC and registered, there are both, registered non-ECC modules and non-registered ECC modules. There is a performance penalty for using registered memory. Each read or write is buffered for one cycle between the memory bus and the DRAM, so the registered RAM can be thought of as running one clock cycle "behind" an equivalent unregistered DRAM.
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512MB 240-pin PC2-5300 DDR2-667 1Rx8 Registered ECC DIMM Memory Module $9.98 512MB 240-pin PC2-5300 DDR2-667 1Rx8 Registered ECC DIMM (p/n BWM)
$9.98
HYS72T128000HR-3S-B, CT12872AB667S.I18F,  CT12872AB667S.K18F,  HYMP512P72BP4-Y5, HYS72T128000HP-3S-A, NT1G72U4PA0BV-3C,  HYMP512P72CP4-Y5,  MT18HTF12872PY-667D2, HYS72T128000HP-3S-B, MT18HTF12872PY-667D2, M393T2950EZA-CE6Q0, EBE10AD4AGFA-6E-E, NT1G72U4PA0BV-3C, HYS72T128000HP-3S-A, M393T2950CZA-CE6Q0, HYS72T128000HR-3S-A, 1GB PC2-5300 DDR2-667 1Rx4 Registered ECC 240-pin DIMM $19.98 1GB PC2-5300 DDR2-667 1Rx4 Registered ECC 240-pin DIMM (p/n BTC)
$9.98
1GB PC2-5300 DDR2-667 2Rx8 240-pin Registered ECC SDRAM DIMM Memory Module $19.98 1GB PC2-5300 DDR2-667 2Rx8 240-pin Registered ECC SDRAM DIMM (p/n CCJ)
$19.98
1GB 240-pin PC2-5300 CL5 Registered ECC DDR2-667 DIMM Memory Module $19.98 1GB 240-pin PC2-5300 CL5 Registered ECC DDR2-667 DIMM (p/n CJG)
$19.98
2GB PC2-5300 DDR2-667 2Rx4 CL5 36c 128x4 240-pin ECC RDIMM Memory Module $19.98 2GB PC2-5300 DDR2-667 2Rx4 CL5 36c 128x4 240-pin ECC RDIMM (p/n AEZ)
$19.98
2GB PC2-5300 DDR2-667 CL5 18c 256x4 1Rx4 1.8V 240-pin ECC RDIMM Memory Module $19.98 2GB PC2-5300 DDR2-667 CL5 18c 256x4 1Rx4 1.8V 240-pin ECC RDIMM (p/n BTD)
$19.98
HYMP125P72CP4L-Y5-C, MT18HVF25672PY-667E1, HYS72T256322HP-3S-A, HYMP125P72BMP4L-Y5, 2GB PC2-5300 DDR2-667 1Rx4 Registered ECC Very Low Profile (VLP) 240-pin DIMM Memory Module $35.98 2GB PC2-5300 DDR2-667 1Rx4 Registered ECC Very Low Profile (VLP) 240-pin DIMM (p/n BIT)
$35.98
2GB PC2-5300 DDR2-667 2Rx8 Registered ECC 240-pin DIMM Memory Module $26.98 2GB PC2-5300 DDR2-667 2Rx8 Registered ECC 240-pin DIMM (p/n CQU)
$26.98
4GB PC2-5300 DDR2-667 2Rx4 VLP Registered ECC 240-pin DIMM Memory Module $79.98 4GB PC2-5300 DDR2-667 2Rx4 VLP Registered ECC 240-pin DIMM (p/n BTK)
$79.98
4GB PC2-5300 CL5 18c 512x4 DDR2-667 1Rx4 240-pin ECC Registered DIMM Memory Module $79.98 4GB PC2-5300 CL5 18c 512x4 DDR2-667 1Rx4 240-pin ECC Registered DIMM (p/n CRL)
$79.98
8GB PC2-5300 DDR2-667 CL5 2Rx4 Dual Rank 240-pin ECC RDIMM Module $159.98 8GB PC2-5300 DDR2-667 CL5 2Rx4 Dual Rank 240-pin ECC RDIMM (p/n CCL)
$159.98
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