Hi, I have a AMD X2 3800+ @ 2.0GHz but it shows up as 575MHz. I install it with Vista and it was fine but when I install it on XP it looked different. here is a pic of what i mean.
Start up Photoshop or another intensive program and it should increase. OEM manufacturers use stepping for power saving and such. When you stress the CPU it should jump up.
And if you spell "the" as "da" you should NOT be flashing your BIOS.