CUV4X question...

Will the CUV4X support a P3-850 to 1000?

As far as I know, the multiplier only goes up to 8x.
Is there a newer bios that will support any higher?

I see a newer bios on the Asus site that says "New micro-code added", but doesnt say what was added.

the multiplier is built inside the processor, not the mainboard or the socket.

the cuv4x should have the support for any coopermine pentium3. at most all you will need is just a bios update.