MS-6590 KT4A Ultra: FSB 333 with DDR400?

Question

Recently purchased an MS-6590. I put in a Athlon XP 3000+ (the FSB 333 version, not the FSB 400 version) and a 1GB Corsair DDR400 stick. How do I get full performance out of this system? It keeps recogniozing the CPU as an XP 2800, not the 3000, and is running at 2088 MHz. I cannot get the multiplier to go to 13. I set the multiplier to "12.5-13". This BIOS doesn't have a "13" setting, only this weird "12.5-13" option. CPU-Z says the multiplier is 12.5. Like I said, I cannot force the "13".
Any suggestions?
Thanks in advance,
Michael

Answer 1

Try DaveR's suggestion first, it is good advice. 
At best, the following is bad advice......
When setting multiplier, keep pressing pagedown passed auto, you get 14 and 15.  I think 12.5/13.0 is the right setting or leave it on auto.  I did read "somewhere" that by going to the very lowest multiplier would recognise as the higher multipliers.  e.g if you set multiplier to 6.0 would recognise as 13.0 (6.5=14, 7.0=15, 7.5=16).   I don't have that processor so I've never needed to do this... but surely it can't hurt to try.  If it doesn't work, reset CMOS and try again.