Ddr != Ddr ?


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snippets from anand tech both mentioning data transfer-rates of DDR memory!

This brings us to the only "upgraded" aspect of the GeForce2 Pro design over the GTS, that is the 200MHz DDR memory clock (effectively 400MHz). At 200MHz DDR, the GeForce2 Pro features a 20% higher memory clock than the GTS (166MHz DDR) resulting in a theoretical maximum of 6.4GB/s of bandwidth to and from the on-board frame buffer. For the sake of comparison, a regularly clocked GeForce2 GTS features 5.3GB/s of available bandwidth while the Ultra can boast an impressive 7.36GB/s.

The obvious and most competitive solution to the dual channel RDRAM of Intel?s 850 chipset is DDR266/PC2100 DDR SDRAM. A single DDR266 channel offer2.1GB/sb> of bandwidth. This is currently as close as you?re going to get to the 3.2GB/s that RDRAM has been able to give the Pentium 4.

DDR @ 200Mhz = 6.4GB/s

DDR @ 166Mhz = 5.3GB/s

DDR @ 133Mhz = 2.1GB/s?

is this not 128bit DDR?

please explain this?

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(2100MB/sec.) / (133Mhz) = datarate for 1Mhz DDR (15.78MB/sec.)

(15.78MB/sec.)*(200Mhz) = datarate 200Mhz DDR = 3160MB/sec.

not 6400MB/sec. ! rough estimate (1GB rounded to 1000MB)

is motherboard DDR 64bit mem?

and graphic card DDR 128bit mem?

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