Monday, December 27, 2010

【 Weak current College 】 memory specifications 】

Single-sided double-memory RAM and the difference between single memory memory chips are on the same surface, and double-sided memory memory chip distribution in both sides. While the single-Bank and double the difference between different Bank. Bank physically interpreted as Northbridge into memory, usually for 64bit per channel. A motherboard performance quality depends primarily on its chipset. Different chipsets supported by the Bank are different. If Intel82845 Series chipsets support 4 Bank, while SIS 645 series chipset is capable of supporting six Bank. If the motherboard supports only four Bank, but we were 6 Bank, then the extra 2 Bank is wasted in vain. Double-sided is not necessarily the Bank may also be a single Bank, pay attention to this point.

These computer hardware articles often appear in the parameter is in the motherboard's BIOS inside the settings on the memory parameters. Usually said of a 2-2-3 order say is tRP (TimeofRowPrecharge), tRCD (TimeofRAStoCASDelay) and CL (CASLatency). TRP-RAS pre recharge time value as small as possible; tRCD is RAS to CAS latency value as small as possible; CL (CASLatency) for the CAS latency, which is longitudinal addresses pulse response time, and also in certain frequencies measured support different specifications of the memory of one of the important symbols.

What is a dual channel DDR technology?, it is not I mentioned earlier, DDRII, but you can have 2 DDR memory sharing, data parallel transfer of technology. Dual channel DDR technology has the advantage that it allows memory bandwidth based on the original doubled the advantage for P4 processor is self-evident. 400 MHz front side bus of P4A processor and motherboard transmission data bandwidth to 3.2GB/s, and 533 MHz front side bus processors is P4B reach 4.3GB/s, which is the P4C processor reaches 800 MHz front side bus and thus need 6.4G memory bandwidth. But in addition to the standard RambusPC1066 I850E support, no memory to meet the needs of the processor, we most commonly used DDR333 itself has only 2.7GB/s of bandwidth. DDR400 can only provide 3.2G/s of bandwidth. In other words, if we build a dual channel DDR400 memory theoretically provide bandwidth of 2 x DDR400. Will thus fundamentally solves the CPU and memory bottlenecks between.

DDR-II memory relative to the mainstream of DDR-I memory now, their operating clock is expected to be as 400MHz or higher. Mainstream memory market will from now on DDR-400 products directly to DDR-II. Currently DDR-II memory will 0.13 Micron, excessive to 90 nm, operating frequency will exceed 800MHZ.

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