Hello, 

i have been having massive fps drops even to 30 fps, happens usually when there are a lot explosions and gas grenades.

My setup:

CPU: intel i7 3770 3.7 ghz.

RAM: 2x Kingston 8GB DDR3 1866MHz CL10 HyperX Fury Red Series

GPU: geforce 780, core overclocked +185mhz, drops happens even without overclocking, that's why i tried oc on the first place.

I checked my gpu usage and it is 99%.

My psu: http://www.corsair.com/en/gs-series-gs800-80-plus-bronze-certified-power-supply-2013-edition

I have at config 7 cores allowed.

I have latest nvidia drivers.

And i can't run it on full hd even on lowest details at 60 fps min, i have stil drops under 60 and i have off gpu resorce limit, or how it calls in-game.

Is this normal ?, i saw benchmark, that says i should be able run it on 60+ at high details, i have sometimes 60 stable, even 90 fps on high, but than i get constant drops to 30 fps, or 47-56 whatever, especially because of explosions.

Benchmarks can't benchmark all in my opinion and real results are very different from benchmarks.

I think game is just extremelly difficult on gpu when, there are 20 gas grenades, because they last long and explosions happen to it.