problems with fps

I'm having problems with my fps.

I used to have 125 fps stable(last time checked was few months ago)
But when i checked yesterday i suddenly had 60fps max.(ofc i did /com_maxfps 125)

The difference between now and then is i have a new videocard and 1 less GB of ram(3 instead of 4)

The videocard i used to have was a Nvidia videocard, now i have a AMD Radeon HD6850.

I still have the same cfg so i don't think thats the problem..

Any idea what i can try to fix this?
thx in advance!

EDIT: it was the vSync. I turned it off and now i got stable 125 fps again.