MB K7T266 ver1.0+AMD 1.4MHZ max upgrade?

Hello,
Could anyone tell me what is the max of RAM I can add to this motherboard please? I have two DDR slots free, the occupied one holds a bar of 256Ram.

I also wanted to upgrade the processor. Would you also know what is the max of MHZ that this board can take? (I guess I will need a better fan – I presently have a very noisy Ball Cooler Master CM 12V – I’d like a quiter cooler one – any ideas appreciated)

The reason is so that I can add a firewire and start video editing. I presently run into memory problems with big video cuts.

Many Thanks