Very weird slowdown in some games with 650m

Hey guys, so i have a very weird problem here that just started a few days ago; i've been noticing this very strange slowdown, so far in two games that i have tested; Lost Planet 2 and devil may cry 4, now the problem just comes and goes at random times and doesn't seem like regular slowdown, to me at least.

An example: i was playing lost planet 2 yesterday and in an area that wasn't really that graphics heavy slowdown occurred for a sec or two and then the framerate returned to normal, sadly i was not using FRAPS at the moment so i cannot say how much the framerate dipped but i can tell you that it was very noticeable. Now in the next game; Devil may cry 4, i have never once seen the framerate dip, not once but today it dipped massively and was also accompanied by some screen tearing even though i had both v-syn and triple buffering enabled via D3D override.

I do have the latest drivers, which i think might be the cause of this, and i have checked for both viruses and maleware on which my computer was clean, any help i would appreciate it greatly.

My Specs:
Nvidia 650M 2GB version
i7 3820 cpu
windows 7
16GB of ram

-EDIT-
Bit of an update on my situation, it seems that this issue is not linked to just those games but all of my games also i was using fraps and there is no framerate drop, so what the hell is this? Frame lag?