lol WRONG! You can run dual channel.
All you need to run dual channel is a matched pair in the proper slots running synchronously!
So if you had, say, a CPU at 400 bus and a pair PC1600 running synchronously, you'd be able to run dual channel. And if you had a CPU at 533 bus and a pair of PC2100 running synchronously, you'd be able to run dual channel. And if you had a CPU at 800 bus and a pair of PC3200 running synchronously, you'd be able to run dual channel.
Now here's the fun part: If you had a pair of PC2700 running stock speed and a 533 bus CPU overclocked to run 166MHz bus, you'd be able to run synchonously and dual channel. But wait, there's more!
Say you had a REALLY oddball overclock like 184MHz bus clock. You could actually underclock the PC3200 to 184 (DDR 368) to run it synchronously, ENABLING dual channel with a matched pair!
Take your 2.4@2.8 for example. Assuming it's a 2.4B (originally 533 bus), that's a bus clock rate of 133, overclocked to 156MHz FSB, your 200MHz rated RAM (DDR400) can easily be clocked down to 156MHz and run in dual channel mode.
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