can someone tell me please why sa-mp freezes?
From my experiences, it's most likely not the script.
All of my crashes are graphics card based, mainly because it sucks.
Try changing some of your settings and make sure your graphics card isn't running at a too high temperature, that might help.
If not that, try clearing out the inside of your PC, it might not be able to spread around heat effectively. Be careful when doing it though, you might accidently fry yourself. Mmm tasty.