mouse hz (mx518)

yes

you're not on msn, fag!

possible, but you should stay with 500hz :-)

posible, but not very stable afaik!

I'd stick with 500HZ. People have 'blown' their mx518 up forcing it to 1000HZ. So play it safe. 1000HZ is less stable.

currently playing @ 500hz - best way 4 mouse
is it possible to get 1000hz with mx518 ? - yes but it will be worse than on 500 (when u set usb clock on 1000hz mx518 will get around 800 hz - not recommended, more unstable)
does it just smooth the movement? - best way is just 500hz
any differences @ sens? - even if we could get 1000hz u wouldn't see much difference between each other clock (4ms@1ms response time - Human eye can't see differences)

and the next thing is that Processor (CPU) is very weighted

if u re using 500 @ win - open Manager of task (ctrl+alt+del) => then "Usage of processor" and when u will fastly move ur mouse look on usage percentage of processor - that will explain a lot (more hz = more processor usage)
that is problem 4 people who have 1 processor on boar
but for that who have duo or quad is not ;)

Conclusion:
mx518@500hz = best mouse 4 today (beat razers, and every laser shit)

I use 1000hz, and i like it