Supreme Series memory modules use original DRAM IC and pass complete cross-platform and durability testing to guarantee compatibility and satisfying performance, ideal for customers who seek enhanced quality and reliability; ADATA memory modules all come with product lifetime warranty. ADATA announces the Number-1 DDR2-667 module which passes the ATI QVL in Taiwan, and this excellent module is avaliable now. Its density include 1GB/2GB/4GB. This module configuration is by 128x8 (1Gbit) die, 8 pcs dies in 1 rank, 16pcs dies in 2 rank. full-speed without extraneous loading. Compared with DDR, DDR2 owns four key technologies pave the way to high-speed operation and low power consumption. 4-bit prefectch DDR2 archieves the high-speed by four times the transmission amount of data . It also doubles the data rate of DDR. In the 4-bit prefetch architecture, READ or WRITE can achieve the four times the amount of data in a really internal bus clock. This is why the DDR2 can operate in four times faster than the internal operation frequency. ODT (On Die Termination) In DDR2, it is composed the termination resistor inside which is applied to match the transmission impedance on the mainboard. It will greatly attenuate the reflected noise resulted from last signals which improves a clear logic-level to avoid the reception of error data. Posted CAS & Additive Latency (AL) In a posted CAS (Column Address Strobe) operation, a CAS signal (READ/WRITE command) can be input to the next clock after RAS (Row Address Strobe) signal (active command) input. The CAS command is held by the module side and executed after the additive latency (0, 1, 2, 3 and 4). It is easier controller design by avoiding collision on the command bus, and improves the command and data bus efficiency due to simple command order. It also improves the practical memory bandwidth by removing the bubble.
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