ram speed mystery

hello, i developed a problem with 1 stick of corsair ram 800 hz ddr2 6400 xs ram. while awaiting replacement i have put my old 5399 667 ram back in, and it doesnt seem any different, my bios recognises the ram as what it is, and has changed latency to what i believe is correct. it seemed with my old cpu there was a notable speed increase when i upgraded to faster ram, and it now seems identical, i recently upgraded the cpu, and updated my bios. my simple question is are any manual changes in bios needed?
off to work now so cant reply till very late im afraid, many thanks.
asus 570 mobo
amd 6400 x2 black edition
2x 1gb crucial 667 ddr2 ram (atm)
xp pro.

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