Well, DDR SDRAM also seems to suffer just as badly when not dual-channel, bandwidth wise. Under PC Pitstop, I see Athlon PC systems get whooped by Pentium 4 PC systems with the cached disk bandwidth speed benchmark

.
Pentium 4 PC systems often get a higher cached disk bandwidth speed
than Athlon PC systems. Often, a Pentium 4 PC system will get approximately
1000 MB/s for the cached disk bandwidth speed, while with Athlon PC systems,
you're lucky to get approximately 512 MB/s under the PC Pitstop cached disk bandwidth speed benchmark!
Also, BTW, I saw a review showing that a Radeon 9200 SE video card scored even WORSE than a GeForce FX 5200! That Radeon 9200 SE video card had a bad benchmark under 3DMark 2001 SE of approximately 4000 3D marks!
I wonder if even my DirectX 7 based Radeon 7000 can score that good?!
Shame on you, ATI for your Radeon 9200 SE!