Server RAM 4GB PC2-5300P ECC REG DDR2 667 PC5300 Memory FITS Dell HP IBM

$8.99

5 in stock

SKU: RAM-4GB-PC2 Category:

Description

The key difference between DDR2 and DDR SDRAM is the increase in prefetch length. In DDR SDRAM, the prefetch length was two bits for every bit in a word; whereas it is four bits in DDR2 SDRAM. During an access, four bits were read or written to or from a four-bit-deep prefetch queue. This queue received or transmitted its data over the data bus in two data bus clock cycles (each clock cycle transferred two bits of data. Increasing the prefetch length allowed DDR2 SDRAM to double the rate at which data could be transferred over the data bus without a corresponding doubling in the rate at which the DRAM array could be accessed. DDR2 SDRAM was designed with such a scheme to avoid an excessive increase in power consumption.

DDR2’s bus frequency is boosted by electrical interface improvements, on-die termination, prefetch buffers and off-chip drivers. However, latency is greatly increased as a trade-off. The DDR2 prefetch buffer is four bits deep, whereas it is two bits deep for DDR. While DDR SDRAM has typical read latencies of between two and three bus cycles, DDR2 may have read latencies between three and nine cycles, although the typical range is between four and six. Thus, DDR2 memory must be operated at twice the data rate to achieve the same latency.

Another cost of the increased bandwidth is the requirement that the chips are packaged in a more expensive and difficult to assemble BGA package as compared to the TSSOP package of the previous memory generations such as DDR SDRAM and SDR SDRAM. This packaging change was necessary to maintain signal integrity at higher bus speeds.

Power savings are achieved primarily due to an improved manufacturing process through die shrinkage, resulting in a drop in operating voltage (1.8 V compared to DDR’s 2.5 V). The lower memory clock frequency may also enable power reductions in applications that do not require the highest available data rates.

According to JEDEC[3] the maximum recommended voltage is 1.9 volts and should be considered the absolute maximum when memory stability is an issue (such as in servers or other mission critical devices). In addition, JEDEC states that memory modules must withstand up to 2.3 volts before incurring permanent damage (although they may not actually function correctly at that level).

  • Samsung 4GB DDR2-667 PC2-5300P ECC Registered Server Memory M393T5160QZA-CE6
  • 1 x 4Gb Memory,
  • P/N: 2Rx4 PC2-5300P-555-12-L0
  • Model: 393T5160QZA-CE6
  • Unit is a working pull from a HP server
  • Additional information

    Brand

    Samsung

    Model

    M393T5160QZA

    Capacity per Module

    4GB

    Type

    DDR2 SDRAM

    Bus Speed

    PC2-5300 (DDR2-667)

    MPN

    M393T5160QZA

    Memory Features

    ECC Memory, Registered