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Description:-----------------Offer DDR Ram----------------- DDR 400mhz Kingston 256mb $14.5 DDR 400mhz Kingston 512mb $29. Specification: DDR 400 MHZ 184-pin socket type dual in line memory module(DIMM) 2.6V power supply Data rate:400Mbps(max. ) 2.5 V(SSTL_2 compatible) I/O Double Data Rate architecture; two data transfers per clock cycle Bi-directional, data strobe(DQS) is transmitted/received with data, to be used in Capturing data at the receiver Data inputs and outputs are synchronized with DQS DQS is edge aligned with data for READs; center aligned with data for WRITEs Differential clock inputs(CK and/CK) DLL aligns DQ and DQS transitions with CK transitions Commands entered on each positive CK edge; data referenced to both edges of DQS Auto precharge option for each burst access Programmable burst length:2,4,8 Programmable/CAS latency(CL):3 Programmable output driver strength: Normal/weak Refresh cycles:(8192 refresh cycles/64ms) 7.8us maximum average periodic refresh interval 2 variations of refresh Auto refresh Self refresh