Sneak Preview: Intel Alderwood/Grantsdale Chipsets

Overview Of DDR Vs. DDR2

Source : Micron DesignLine Vol. 12, 3Q03

DDR2 : Speed

More interesting than the potential clock speeds are the bandwidths in dual channel operation that result from them (far right column) :

Memory Type Clock Speed Name Bandwidth
Single-Channel
Bandwidth
Dual-Channel
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

* Source : Corsair website

8,533 MB/s (8.33 GB/s) in dual-channel operation is what we get with DDR2 533 - and this in itself sounds promising. However, there are two major factors that will fundamentally reduce the extra performance potential : firstly, the timings that have been possible up to now with CL 4 and 4-4-12 can still be increased ; secondly, at 533 MHz in the DDR process, the memory has to be run pseudo-synchronously to the 800 MHz FSB of the P4 (quad-data rate process) at a ratio of 2:3 - in the past, this has often proven to be an effort made in vain.

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