Sudden Lag

Everysince yesterday(September 1) my game has been lagging. I have used the same settings, everything the same, but it dropped 10 fps down. Anyone know why? M my recording, and I haven't installed any new programs except speccy. My specs are in my signature.
Edit: I know my ram sucks, but it never happened before, so idk why.
Specs for mobile users:

Specs
CPU: i7-4790@3.6GHZ, Haswell 22nm Technology
Video: Gigabyte Nvidia GTX960 4GB GDDR5
Display: DELL E2414H (1920x1080@60Hz)
Ram: 16.0GB Dual-Channel DDR3 @ 798MHz
Motherboard: Dell Inc. 0KWVT8

 

Nothing. Just installed speccy

 

Your video card may be acting up. Sometimes, for no reason at all, my video cards will lock themselves to a solid (insert stupidly low 3 digit number here) MHz. It happens overnight, and will cause lag. If you have some sort of utility to check the clock speed of your video card, such as MSI afterburner, try having that up while you play. It is very possible that you will not see clock speeds go above a certain threshold, even though you know the card goes higher than that.

If that is the case, restart your PC. That should fix it, but if it does not reinstall your video drivers.

 

^^
I have my cards pushed to the max, running at 1400MHz. You are probably right.

OP, my advice only applies if you have overclocked your cards, but it still couldn't hurt to see if they are thermally throttling due to a damaged fan.

 

Would it apply if I have a pre overclocked card? I have a gigabyte card and it comes with a pre-overclock.

--- Post updated ---

 

Possibly. You could have gotten a bad chip that can't take the overclock applied at the factory. Just get msi afterburner and have that open while you play, make sure you look at temps, GPU usage and clock speed.

 

I just restarted and its back to normal. Its fine now.