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Ok so basically it looks like it's a Call of Duty problem, because CS and GTA V are running fine just like before.

Maybe I should to downclock it myself even further to 2133MHz because that was the old memory's clock?

ofcourse, the board only has 2 slots

Yeah I completely understand, but I wanted to upgrade to 16GB because 8GB was just not enough anymore

non K Also 1 more thing, the RAM scored 77% on userbenchmark.com, which is pretty much the average for 2x8GB 2400 DDR4 RAM. Maybe Call of Duty just had a bad update for quad-cores?

So I upgraded my HyperX Fury 2x4GB 2133MHz DDR4 RAM to Patriot Viper Steel 2x8GB 3200MHz. My motherboard only supports up to 2400MHz so the new RAM is downclocked to 2400. I read online that there shouldn't be any issue with the downclock. I bought the 3200MHz RAM because I want the PC to be ready for future upgrades (I will probably get a Ryzen next year). I never really benchmarked games that much, but it 'feels' like the performance has dropped. Could this be because of the downclock, maybe I need to mess around with the timings? I do not have any experience with RAM timings. XMP is enabled. I'm running an i5 7500 and a GTX 1660 6GB. Thanks in advance!

Reinstalled Windows, everything is working perfectly fine now, even MW Thanks for all the answers, I appreciate the help.

Set MW's priority to Normal and download Priority Saver to automatically set the Priority whenever you launch the game. That fixed it for me.

That has literally nothing to do with this. Most people store their games on the HDD and I NEVER HAD PROBLEMS WITH GAMES until a few weeks ago.

OS and program are on the SSD, games and other data on the HDD. It looks like my PC has gone completely mad yet again. Now I don't have the SSD 100% usage problem, nor is my RAM being fully used, now my HDD is on 100% and spiking and the game is completely unplayable with massive sutters?!?!?! Here are some screenshots:

So, upgrading to 16 GB will solve this issue? I just don't understand how I never had problems running games before, and now I do... Probably a Windows update, but oh well, I can't revert because it's too late.

But my PC was completely fine until like two weeks ago. But for Modern Warfare, yes, I think 8GB RAM is not enough for it. For other games though, it's fine, because they ran butter smooth before this crap started happening. Also, some processes like Service Host ones and e.g. "Microsoft Compatibility Telemetry" have been jumping in usage to as much as 30%. I have ran a Malwarebytes scan and it detected no malware. I haven't downloaded anything since the PC was fine too.

Hello. So recently my PC has been doing this really weird thing. Sometimes the disk spikes to 100% and the PC completely freezes for a few seconds, in the same time CPU usage drops. Here is a picture from Task Manager when that happens: This happens when I play Modern Warfare the most. It spikes every 30sec-1min and the PC completely freezes for 20 seconds. It started happening in GTA V too but less than in MW, and the FPS is not like it used to be before, it started dipping below 60 FPS. I always had 90 FPS+ though. In Rise of the Tomb Raider, the FPS is also not like it used to be before, it has also started to dip below 60. In Modern Warfare, even though the disk spikes happen the most in it, I have good FPS (80+). The only games that I play that work normally are CS:GO and Minecraft. I also noticed that, for some reason, the GPU usage is 1-10% when I play the games in which I have started to have problems. When I play CS:GO, the GPU usage is fine, just like it used to be before. Also, when I stress the GPU, Task Manager says it's between 1-10% too. How is this even possible? Is Task Manager bugged? My PC: i5 7500 2x4GB RAM GTX 1660 120GB SSD 2TB HDD Does anyone know what is causing this? I have tried a lot of fixes, but none of them seem to work. I doubt that my SSD is failing because every software says that it's healthy, and this issue doesn't happen in every game. I've installed all the latest drivers for everything. Thanks in advance.

Ramping up the card's fans to the max doesn't help at all... But thanks everyone!

Zalman T5. I'll try opening the side panel tomorrow to see if it's because of the case.