You were right, it was totally unsafe to run it at 1300mhz. I had a feeling that was a ridiculous jump. My GPU crashes if I go over 900mhz I have no clue why It was automatically shutting them back down to 686mhz. those higher numbers yesterday. I'm guessing it wasn't actually . i actually settled on 800 before I read your post to me, but I'll put it down more probably around 750 and leave it here. On GPU-z 800mhz bring it to the level where is practically as high as possible, so it can't be clocked more than that (safely at least).
Anyways, thanks for your help you answered my question and saved me from using it at higher than I should've. Thanks so much.
686 Mhz is the stock speed. If you're running this in a notebook, I wouldn't recommend overclocking it much, if at all. 700 MHz, would be as high as I would go. Chances are it isn't running at 1300 MHz, as that is nearly double the clockspeed. It may run at 1300 at idle, but playing a game might cause it to underclock due to heat issues.
If you want to overclock it, bump it up to 700 MHz, and then 750 MHz if you aren't having heat problems.