When im on an tourney with many members,my gfx and ingame lags so hard that makes TB crash.
What should i do?

I lost an tourney yesterday beacose of this.

You need more processing power. Other than clocking or spending money on parts you could clear any background apps you've got running.

Turn shaders off (obviously), /opt blood 0, turn ghosts off after you've made your moves or when you're waiting. If the game slows down when players are very near to each other, try zooming out.

I don't run shaders,my gfx is only 64mb.

I thought you left?

Anyways, if its the chat of the many people that are in the server, simply do the command: /opt chat 0
If you run shaders, you should turn them off before entering a tourney, unless you have a very good computer.
I also suggest to turn off blood: /opt blood 0, and maybe bruise too: /opt bruise 0

Hopefully some of my suggestions will help you.

ACtually i left the forums.
I'm only in game
Reason:I have an serious infraction that will make me an easy ban.So to stay clean im out from this forums.

overclocking could work.....but i have forgotten how to do this, anyone want to him and me how?

Clocking's different for different hardware. Your best bet is to google overclocking your motherboard, you'll get a proper tutorial that way.