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DDR3-2000 memory with 9-9-9-28 latency (9 ns) was available in time to coincide with the Intel Core i7 release in late 2008, [19] while later developments made DDR3-2400 widely available (with CL 9–12 cycles = 7.5–10 ns), and speeds up to DDR3-3200 available (with CL 13 cycles = 8.125 ns).
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 ...
Because modern DRAM modules' CAS latencies are specified in clock ticks instead of time, ... DDR3-2000 2000 MT/s 0.500 ns 1000 MHz 1.000 ns 9 9.00 ns
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 ...
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.
DDR3 clocks in nanoseconds (tCK): DDR3 1066 is 1.876ns DDR3 1333 is 1.50ns DDR3 1600 is 1.25ns DDR3 1866 is 1.07ns DDR3 2000 is 1.00ns Two common memory speeds and timings DDR2 800 5-5-5-15 has latencies of 12.5-12.5-12.5-37.5 (expressed in nanoseconds) DDR3 1600 9-9-9-24 has latencies of 11.25-11.25-11.25-30
2000 HT 512 DDR2 DDR3: MMX, SSE, SSE2, SSE3, SSE4a, Enhanced 3DNow! PowerNow! AMD64, NX bit, ... Clock rate Bus Speed & Type [a] L1 L2 L3 Socket Memory Controller
DDR SDRAM operating with a 100 MHz clock is called DDR-200 (after its 200 MT/s data transfer rate), and a 64-bit (8-byte) wide DIMM operated at that data rate is called PC-1600, after its 1600 MB/s peak (theoretical) bandwidth. Likewise, 12.8 GB/s transfer rate DDR3-1600 is called PC3-12800. Some examples of popular designations of DDR modules: