When a disk is used at 100%, be it a SSD or a "regular" hard disk, I get a lot of lag with the games I launch, even if they are not on the disk that's being heavily used (OverWatch or PUBG). Even the applications I have on the side are slowed down (HandBrake for example).

As soon as the disk isn't used anymore, then the problem disappear.

I'm using Win 10 64 Bits and the Microsoft AHCI driver. I've installed the latest AMD chipsets 18.10b. No RAID anywhere. 

My disks are all SATA of course, Seagates and Crucial/Intel. My OS is on a Samsung 960 NVMe. All the disks are in a peachy condition. 

My tower is very well (too well) ventilated, my TR never goes above 60° under really heavy load. My disks are all well cooled down as well.

Any idea on how to solve this issue?  Help would be greatly appreciated :)

So thanx for your feedback :)

I have a "clean" install of Windows, I mean it was clean and pure when I installed in with my configuraiton. Since then, November, I did all the Windows updates necessary, and not more. I just updated the AMD chipset drivers and that's it. My system is pretty clean I think. I keep it this way because I don't want to have an unstable computer :)

This is also why I don't use any tricks to make it go faster or... I leave Microsoft and Windows choose what's best for my system. I leave the swap file where it is, the size the OS recommends, and so on. This is the best way to avoid the BSODs so many have when they try to tweak it the wrong way. 

My system is "stable" apart from that little problem. 

No, it's not a new issue. It started a few months ago. I can't tell if it started after a Windows Update (there are so many). But certainly not after an AMD update, I updated the chipset drivers only when there was a new one, and there's been only 3 of them I think since the TRs started to sell. 

I will not remove my NVMe drive. First because I don't see the point, it's not the one being used 100% when the lag starts. Second, I'm not the only one with this problem, we are a few on another forum having the same lag but on different motherboard. We suspect it's either the AHCI driver that Windows is using, but one user has tried the AMD driver and the problem remains, or it has to do with the X399 chipset, which could be the case since we're talking about different motherboards and users having the same problem.

Pretty weird...

The program accessing heavily the drive is NiouzeFire and the program lagging then are games like OverWatch or PUBG on a different drive (SSD) and/or Handbrake/ Vidcoder ripping on a different hard disk.

I have one M2 NVMe system, 2 SSDs and 2 hard disks, and a CD/BD drive. So 5 SATA ports are used and one M2. Crystaldisk reports that everything is A-OK on all drives. 

It is. Like I said, I leave Windows decide what goes where and how big it should be. I mean, who knows more about Windows than MS? :)

I haven't unpluged the other drives. I used to use them in my previous Ryzen 1800x config and they were running fine too. 

I launch Niouzefire and it runs when I'm trying to play or encode. I agree that Handbrake/Vidcoder use lots of ressources (especially since I'm encoding H265) but it's really the use of the disks (hard disk or SSD) that's taking its toll on the system. 

To tell you the truth, I have had the same problem with my "old" FX8370 and my Ryzen 1800x but thought it was because I had too many disks and maybe not enough hardware ressources or... That's why I'm leaning to blame either the AHCI MS driver or the X399 AMD chipset. 

But I don't see many complaining, so that's why I thought I would start this thread and see if I was the only one here or not.