| Jayos, with the P5B the POST screen is wrong to put it simply.
As Yellowbeard suggests, CPU-z is the best way to see what your ram is running at.
My ram is PC6400 and the post screen says 4300 too, this seems to happen if you set the memory and cpu timing to 1:1
If you have got it at 1:1, then with your FSB at 211 your ram would be running at 422 which is obviously underclocked.
You can change the dividers to things other than 1:1 and if you are following clunks overclocking guide for the P5B you will most like see 4-5 options. Auto, DDR422, and some other numbers.
I believe that originally these will have been set to 4300, 5400, 6400 and maybe 8500 dividers but technically you could choose one up to 566 (or maybe depending on whether or not the ram would take it (cooling etc))
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