Extreme FPS Drops only in CS GO?

There are very many reasons this could be happening. One of which is definitely your sound card drivers.

Try to notice if you get the lag when a specific sound is played or when a new sound appears again in the game. For example, I get lag spikes myself when I start the game at first. Then when some time passes and I haven't heard, say, smoke grenade sound, when I hear it I get lag spikes.

This is very annoying and the reason is probably my sound card as I have installed and uninstalled sound and graphics card drivers, neither of which have helped.

• Try to mess with your audio and graphics drivers.

• Lower your Hz from 'Sound' properties to CD, not DVD or Studio.

Also, try to be more specific with your problem. When exactly does this happen? How often?

While I wouldn't advise you to run your PSU upside down for an extended period of time, if you can run a much more taxing game without issues the issue is almost certainly a software one. I would try reinstalling the game as that is probably the easiest fix, and after that updating any audio or video drivers. Unfortunately none of this may work.

I had a very similar issue (lag when certain sound files played) with a game that turned out to be an audio codec issue. There are various tools for cleaning out codecs, but they are not perfect. The only way I could fix the issue was doing a full system restore to a point before the problem appeared. If this is unavailable to you might need to reinstall Windows and do a clean wipe. Though this is probably the most extreme measure to fix any software issue like this (so exhausting things like updating drivers and reinstalling the game are probably worth it) , it generally works with a higher probability than any other method.

Getting 400 FPS is purely a waste of power and results in a lot of excess heat. If your GPU gets very hot, it will throttle down to prevent damage to hardware which explains your periodical FPS drops.

Anything higher than your monitors refresh rate won't make any difference to you as you won't be able to see the frames your GPU renders, because your monitor simply can't show them.

I'd recommend get your frame rate fixed to your monitor's refresh rate.

It happens to me, I solve it by opening Nvidia control panel after starting the game(assuming you have nvidia video card).

Stop forcing your PC to run all at ultra some things PC cant handle because they might be bugged becasue they are new and not correctly developed and that can cause it!