(1) 4GB (1x4096MB) PC2-8500 DDR2-1066 Non-ECC Unbuffered DIMM Please e-mail/chat with us (and have your system's make & model) to verify full compatibility. Thank you.
- Single stick of premium brand-name 4096MB PC2-8500 DDR2-1066 Non-ECC unbuffered memory.
Maximum Memory: (please contact us for specific system details)
Memory Slots: 1 or more
Note: Memory does not need to be installed in pairs. All of the memory sticks we sell are low density which means the highest compatibility possible.
DDR SDRAM (double-data-rate synchronous dynamic random access memory) is a class of memory integrated circuits used in computers. It achieves nearly twice the bandwidth of the preceding "single data rate" SDRAM by double pumping (transferring data on the rising and falling edges of the clock signal) without increasing the clock frequency.
With data being transferred 64 bits at a time, DDR SDRAM gives a transfer rate of (memory bus clock rate) × 2 (for dual rate) × 64 (number of bits transferred) / 8 (number of bits/byte). Thus with a bus frequency of 100 MHz, DDR SDRAM gives a maximum transfer rate of 1600 MB/s.
JEDEC has set standards for data rates of DDR SDRAM, divided into two parts. The first specification is for memory chips, and the second is for memory modules. As DDR SDRAM is superseded by the newer DDR2 SDRAM, the older DDR version is sometimes referred to as DDR1 SDRAM.
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