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DDR2-667 Is Coming!

Looking ahead to Intel's 925XE chipset and FSB1066
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You can read about the basics of DDR2 memory here . DDR2 is the successor to conventional double data rate SDRAM, but does not introduce any really new technology. Data is transmitted both at the rising and the falling clock edge, which results in a doubling of bandwidth. DDR2-533 works at a basic clock of 266 MHz. Multiplying by its bus width of 64 bits will give you the bandwidth in Megabits per second. Dividing by 8 will result in MegaBytes per second. The following table includes all common DDR memory types:

Memory Clock Type Bandwidth
Single Ch.
Bandwidth
Dual Ch.
DDR266 133 MHz DDR PC2100 2,100 MB/s 4,200 MB/s
DDR333 166 MHz DDR PC2700 2,700 MB/s 5,400 MB/s
DDR400 200 MHz DDR PC3200 3,200 MB/s 6,400 MB/s
DDR2-400 200 MHz DDR PC2-3200 3,200 MB/s 6,400 MB/s
DDR2-533 266 MHz DDR PC2-4300 4,266 MB/s 8,533 MB/s
DDR2-667 333 MHz DDR PC2-5300 5,333 MB/s 10,666 MB/s
DDR2-800 400 MHz DDR PC2-6400 6,400 MB/s 12,800 MB/s

The credo of DDR2 memory is to increase the clock speed in order to get more bandwidth - even with reduced timings. CL4-4-4-12 are typical timings for DDR2-533, while the JEDEC only specifies CL5-5-5-15 for the higher speed grades. All three DDR2 memory types we received by now are able to run DDR2-700 (350 MHz) at CL4-4-4-12. Crucial does even allow for CL4-4-4-10.

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