why isn't my memorry running at 400mhz?

ok, i got a P4 2.8 GHZ HT processor.

I got 4 pieces of ram from kingston, they are same models, same speed, same size.  the ram are DDR pc 3200.

but why isn't my ram running at 400mhz?

see the screenshots i attached below:



how to make my ram to run at 400 mhz?

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everything is right. :)
see http://en.wikipedia.org/wiki/DDR_SDRAM

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Your memory is running correctly at 2(DDR)X200=400(effective clock).
You dont have any problems here, since you are running DDR ram, the double data rate from the ram takes the 199.8Mhz and doubles it to effectively 400 Mhz.
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