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The highest-rated DDR2 modules in 2009 operate at 533 MHz (1066 MT/s), compared to the highest-rated DDR modules operating at 200 MHz (400 MT/s). At the same time, the CAS latency of 11.2 ns = 6 / (bus clock rate) for the best PC2-8500 modules is comparable to that of 10 ns = 4 / (bus clock rate) for the best PC-3200 modules.
Thus, with a bus frequency of 100 MHz, DDR SDRAM gives a maximum transfer rate of 1600 ... DDR2-800 200 5 400 800 6400 DDR2-1066 266 + 2 ...
There are several limits on DRAM performance. Most noted is the read cycle time, the time between successive read operations to an open row. This time decreased from 10 ns for 100 MHz SDRAM (1 MHz = Hz) to 5 ns for DDR-400, but remained relatively unchanged through DDR2-800 and DDR3-1600 generations. However, by operating the interface ...
DDR SDRAM at 400 MHz (DDR-400 or PC-3200) DDR2 SDRAM at 800 MHz (DDR2-800 or PC2-6400) DDR3 SDRAM at 1600 MHz (DDR3-1600 or PC3-12800) Now suppose that we overclock FSB to 250 MHz so that CPU operates at 10 × 250 MHz = 2.5 GHz and memory clock operates at 250 MHz (Memory Divider × FSB).
HyperTransport (800 MHz, 16-pair) 25.6 Gbit/s: 3.2 ... PC2-3200 DDR2 SDRAM: DDR2-400: 100 MHz: 200 MHz: 0.400 ...
To emphasize the advantages of the DDR technique, this type of RAM was marketed at speeds twice the actual clock rate, i.e. the 400 MHz Rambus standard was named PC-800. This was significantly faster than the previous standard, PC-133 SDRAM , which operated at 133 MHz and delivered 1066 MB/s of bandwidth over a 64-bit bus using a 168-pin DIMM ...