How high can i go in CPUs?

[OptimusRhyme]

Ok, hopefully someone can help me here, but i have no clue at all.
Ive got an ECS P4S5A 1.x motherboard, im currently using a 1.6ghz Intel chip.
My question is, how high of a chip can my motherboard support?
The chip im using now has a FSB of 400. I looked all over, yet didnt see anything saying i couldnt go a certain speed.
The motherboard only supports 400 FSB too.
Heres the site if anyone knows.

http://www.ecs.com.tw/products/p4s5a.htm

Thanks for your help.

 

[Actaeon]

I would assume any northwood processor with a 400mhz FSB speed.

 

[OptimusRhyme]

Yeah, thats what i guessed.

But im not entirely sure. Is that how it works?