Product Details  super high quality products with competitive price  1. DDR 400MHz 2. 184-pin socket type dual in line memory module (DIMM) 3. 2.6V power supply 4. Data rate: 400Mbps (max.) 5. 2.5 V (SSTL-2 compatible) I/O 6. Double data rate architecture, two data transfers per clock 7. Bi-directional, data strobe (DQS) is transmitted/received with data, to be used in capturing data at the receiver 8. Data inputs and outputs are synchronized with DQS 9. DQS is edge aligned with data for read, center aligned with data for write 10. Differential clock inputs (CK and CK) 11. DLL aligns DQ and DQS transitions with CK transitions 12. Commands entered on each positive CK edge, data referenced to both edges of DQS 13. Auto precharge option for each burst access 14. Programmable burst length: 2, 4, 8 15. Programmable/CAS latency (CL): 3 16. Programmable output driver strength: normal/weak 17. Refresh cycles: (8192 refresh cycles/64ms) 18. 7.8US maximum average periodic refresh interval 19. 2 variations of refresh 20. Auto refresh 21. Self refresh