NVIDIA needs to receive multiple credits with ViewSonic's excellent gaming display, with both G-Sync technology helping to smooth out the refresh rate, and the Pascal-based Titan X which is the single-fastest graphics card on the market.
Without NVIDIA's new GTX 1070 and GTX 1080 graphics cards (alongside the much more expensive Titan X), there is no card fast enough from AMD for gaming at 1440p at 165FPS. The Fury X is the fastest single-GPU graphics card from AMD currently, and it isn't capable of that. AMD will change this with Vega in a few months, but NVIDIA needs credit for crafting and owning the high-end enthusiast market.
I've explained that I think gaming at 165FPS is amazing, but everyone is different. I think the difference between 60FPS and 120FPS is large, but the 120FPS to 165FPS difference is a different argument. It comes down to how much you play FPS games, and whether or not the additional frames above 120FPS are worth it.
If you saw the difference between 60FPS and 120FPS easily, you should notice a sizable difference between 120FPS and 165FPS. As it stands, there are no 1440p 120Hz monitors that I'm aware of, as they all started at 144Hz. But now 144Hz has been replaced by 165Hz, and ViewSonic has the market to itself at the moment with the impressive XG2703-GS.
If you've got the GPU horsepower to back it up, you won't regret the ViewSonic XG2703-GS - it's gaming at the current ultimate level in resolution and refresh rate. That is until the upcoming 4K 144Hz HDR displays get here - but even then, they will be $1500-$2000.
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