Single sided DDR400 512MB?

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When using two sticks of DDR400 double sided memory my motherboard (Asus K8N-E socket 754) will only run at DDR333. To run at full speed (DDR400) two sticks of single sided memory are needed or just a single stick of double sided memory.

Can anyone explain this to me and recommend some 512MB single sided sticks to replace the memory I currently have?

Thanks

 

[Roll]

The best bet would be to get a single 1Gb module if your budget will stretch that far.

Thats what I figured, so I'm now on the hunt