Upgrading from ASUS R9 390

Solution
If you are looking to get a 1440p monitor with 60Hz refresh rate, the GTX 1070 will allow you to max out AAA titles. But if you go for a 1440p/144Hz+ monitor, you might have to get a GTX 1080/1080Ti - but it'll be way past your $400-limit.

So, with a $400 budget, a GTX 1070 should be a significant upgrade from your video card. The GTX 1070 is about 1.5x faster in effective speed compared to the R9 390 (http://gpu.userbenchmark.com/Compare/Nvidia-GTX-1070-vs-AMD-R9-390/3609vs3481).

If you really need to upgrade now, then, the GTX 1070 will serve you well. But, as your R9 390 is still a powerful GPU for your current system and can still handle 1440p-resolution gaming (albeit at a...


CPU: Ryzen 7 1700
PSU: Thermaltake TR2 800w
Monitor res: 1680x1050(Planning on a 2k upgrade after GPU upgrade)
Games: AAA Titles maxed out preferably
Buget: $400 or less
 
If you are looking to get a 1440p monitor with 60Hz refresh rate, the GTX 1070 will allow you to max out AAA titles. But if you go for a 1440p/144Hz+ monitor, you might have to get a GTX 1080/1080Ti - but it'll be way past your $400-limit.

So, with a $400 budget, a GTX 1070 should be a significant upgrade from your video card. The GTX 1070 is about 1.5x faster in effective speed compared to the R9 390 (http://gpu.userbenchmark.com/Compare/Nvidia-GTX-1070-vs-AMD-R9-390/3609vs3481).

If you really need to upgrade now, then, the GTX 1070 will serve you well. But, as your R9 390 is still a powerful GPU for your current system and can still handle 1440p-resolution gaming (albeit at a non-Ultra/high-ish graphics settings), my recommendation is to upgrade your monitor first before the GPU. This will also give you ample time before the AMD Vega GPUs hit the market. At that point in time, having a 1440p monitor, you can easily decide which GPU would be suit you for the price (by then, GTX 1070s might drop down a couple of $$$ in price if the Vega GPUs can compete with them).
 
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Alright, thanks for the info :)