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2. Memory timings - Wikipedia

   en.wikipedia.org/wiki/Memory_timings

   Without knowing the clock frequency it is impossible to state if one set of timings is "faster" than another. For example, DDR3-2000 memory has a 1000 MHz clock frequency, which yields a 1 ns clock cycle. With this 1 ns clock, a CAS latency of 7 gives an absolute CAS latency of 7 ns. Faster DDR3-2666 memory (with a 1333 MHz clock, or 0.75 ns ...

3. DDR3 SDRAM - Wikipedia

   en.wikipedia.org/wiki/DDR3_SDRAM

   With data being transferred 64 bits at a time per memory module, DDR3 SDRAM gives a transfer rate of (memory clock rate) × 4 (for bus clock multiplier) × 2 (for data rate) × 64 (number of bits transferred) / 8 (number of bits in a byte). Thus with a memory clock frequency of 100 MHz, DDR3 SDRAM gives a maximum transfer rate of 6400 MB/s.

4. Synchronous dynamic random-access memory - Wikipedia

   en.wikipedia.org/wiki/Synchronous_dynamic_random...

   At higher clock rates, the useful CAS latency in clock cycles naturally increases. 10–15 ns is 2–3 cycles (CL2–3) of the 200 MHz clock of DDR-400 SDRAM, CL4-6 for DDR2-800, and CL8-12 for DDR3-1600. Slower clock cycles will naturally allow lower numbers of CAS latency cycles.

5. Dynamic random-access memory - Wikipedia

   en.wikipedia.org/wiki/Dynamic_random-access_memory

   Double data rate SDRAM (DDR SDRAM or DDR) was a later development of SDRAM, used in PC memory beginning in 2000. Subsequent versions are numbered sequentially (DDR2, DDR3, etc.). DDR SDRAM internally performs double-width accesses at the clock rate, and uses a double data rate interface to transfer one half on each clock edge. DDR2 and DDR3 ...

6. Memory divider - Wikipedia

   en.wikipedia.org/wiki/Memory_divider

   Then, the base memory clock will operate at (Memory Divider) × (FSB) = 1 × 200 = 200 MHz and the effective memory clock would be 400 MHz since it is a DDR system ("DDR" stands for Double Data Rate; the effective memory clock speed is double the actual clock speed). The CPU will operate at 10 × 200 MHz = 2.0 GHz.

7. DDR SDRAM - Wikipedia

   en.wikipedia.org/wiki/DDR_SDRAM

   DDR3 advances extended the ability to preserve internal clock rates while providing higher effective transfer rates by again doubling the prefetch depth. The DDR4 SDRAM is a high-speed dynamic random-access memory internally configured as 16 banks, 4 bank groups with 4 banks for each bank group for ×4/×8 and 8 banks, 2 bank groups with 4 ...

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9. CAS latency - Wikipedia

   en.wikipedia.org/wiki/CAS_latency

   Column address strobe latency, also called CAS latency or CL, is the delay in clock cycles between the READ command and the moment data is available. [1] [2] In asynchronous DRAM, the interval is specified in nanoseconds (absolute time). [3]