PUBG has some fps issues in general. There have been countless posts on Steam and Reddit with people having 1070's,1080's, RX580's, 1080 TI's, ect and still getting FPS drops. Some people ended up locking their FPS to 50, because when at 60 if they dipped to like 58 FPS, it causes stutters, which in that game will get you killed quickly.

I don't think you need a GPU upgrade right now, since you're still on 1080p and because of how GPU prices are in general with the stupid inflation. RAM could use an upgrade; unless that image is wrong, it looks like it's 799 or 99 MHz??? lol I don't know, I'm straining my eyes trying to read that. Personally I think a Ryzen 5 CPU and 8 or 16 GB of 3,000 MHz+ RAM would suit you.

Something like this is what you could start with. I put two motherboards in the sperate list, so you can choose just in case you want a full black or a black and red.

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Assuming you have a CPU cooler that isn't stock, you may have to get a new one to fit your new motherboard. I would recommend the NZXT Kraken X62 but there are other options.

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You could also throw in a Ryzen 7 1800X at that point too if you're fine going a few bucks over budget.

Price with Ryzen 5 and ASUS mobo: $427.86
Price with Ryzen 5 with MSI mobo: $428.78
Price with Ryzen 5 with ASUS mobo and Kraken x62: $587.85
Price with Ryzen 5 with MSI mobo and Kraken x62: $588.77
Price with Ryzen 7 1800x with ASUS mobo and Kraken x62: $807.85
Price with Ryzen 7 1800x with MSI mobo and Kraken x62: $808.77

TaigaAisaka wrote PUBG has some fps issues in general. There have been countless posts on Steam and Reddit with people having 1070's,1080's, RX580's, 1080 TI's, ect and still getting FPS drops. Some people ended up locking their FPS to 50, because when at 60 if they dipped to like 58 FPS, it causes stutters, which in that game will get you killed quickly.

Quoting this because it's a great point. 40-65FPS is pretty good and a GPU upgrade isn't even necessarily going to help much. Plus with the pricing of GPUs being so ridiculous right now, it's really the worst time to be buying a GPU. Your R9 390 is still a perfectly good GPU, trades blows with the GTX 1060 and RX 580. So, unless you want to spend GTX 1080 money to get a lower end GTX 1070, I would stick with the 390.

TaigaAsaka wrote RAM could use an upgrade; unless that image is wrong, it looks like it's 799 or 99 MHz???

Dual channel, 799MHz. So, 2x4GB @ 1600MHz is what he's running(or at least he's running 1600MHz XMP).

OP - i5-4460 is still a good CPU. It still trades blows with current gen locked i5's and 4 core R5 CPUs in games, so honestly, I probably wouldn't even bother upgrading to a new socket. I'd add another 2x4GB RAM so you have a total of 16GB, which will be nice. It won't help much in most games, but it's nice to have. The only CPU upgrade that's really logical IMO, would be if you could grab a Xeon E3-1230/1231 V3 for hyperthreading.