Are FSB speeds in PC Chips M848A asynchronous?

My motherboard (MSI-6561) runs an AthlonXP 2600+ at 300MHZ FSB, yielding a
true clockspeed of 2.25GHz. I use PC2700 DDR RAM, underclocked from 333 to
300MHz. The 2600+ spec is 266 MHz FSB.

If I replaced my MSI-6561 with the M848A, kept my RAM, video card, and CPU,
I could improve USB from 1.0 to 2.0, AGP from 4X to 8X, UDMA from 100 to
133.

And I might be able to OC the FSB: Can I?

All this for $40. I'm getting tempted.