Is This a Good Gaming Pc?

If this is a new build then it needs to be modified, the first build is what I would do. There are some issues with the component selection, to me it is not a balanced build. Note that I have gone from Intel to AMD for CPU.

Second build is my estimate of cost to build this from new componenents. Pricing is from PCPartpicker, I find you can usually shave a couple of bucks off here and there but it is pretty close. I had to estimate the pricing for the GPU and PSU.

But I suspect this might be a used buy, here is my evaluation of the components.

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  ■ Overall: Mid level build with CPU/GPU capable of running 1440p at high settings while maintaining 50+ FPS in just about all games. Would not run 4K well.■GPU: The GTX 1070 is a great card for the money and the Gigabyte Founders Edition is very decent 1070■CPU: 6th gen top of the line i5 capable of good overclocks. Still a very valid CPU for today's games although it might struggle with some of the very CPU intensive games.■RAM: Here we start to go off the rails, Decent quality RAM but 2400 MHz is a little slow for an overclocking build■ Mobo: And we really go off the rails here, this is a low budget mobo which is incapable of overclocking, bad pairing with a high end K-type i5 CPU.
  https://www.pugetsystems.com/labs/articles/Z170-H170-H110-B170-Q150-Q170---What-is-the-Difference-635/■PSU: The VS series is really bottom of the barrel for Corsair; low quality components, poor construction and build quality.
  http://www.tomshardware.com/answers/id-2840345/corsair-vs650-good-psu.html■SSD: One of the better SSD's on the market but this will have little impact on gaming performance. But a really good SSD.■HDD: Good mid-level 2TB, I often recommend this HDD.■Case: Decent budget case■CPU Cooler: Decent budget air cooler although there are better ones in this price range.■OS: This is the full version of Win10 so you will be able to move it from machine to machine (as opposed to the OEM version which you can't).

First Build
PCPartPicker part list: https://pcpartpicker.com/list/WdFqjc
Price breakdown by merchant: https://pcpartpicker.com/list/WdFqjc/by_merchant/

CPU: AMD - Ryzen 5 1600X 3.6GHz 6-Core Processor ($225.89 @ OutletPC)
CPU Cooler: Deepcool - GAMMAXX 400 White 74.3 CFM CPU Cooler ($34.99 @ SuperBiiz)
Motherboard: MSI - X370 GAMING PRO CARBON ATX AM4 Motherboard ($144.99 @ Amazon)
Memory: Team - T-Force / Night Hawk 16GB (2 x 8GB) DDR4-3200 Memory ($159.99 @ Newegg)
Storage: Crucial - MX300 275GB 2.5" Solid State Drive ($92.99 @ Amazon)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ Amazon)
Video Card: MSI - GeForce GTX 1070 8GB Video Card ($469.79 @ OutletPC)
Case: NZXT - S340 (Black) ATX Mid Tower Case ($65.99 @ SuperBiiz)
Power Supply: SeaSonic - 650W 80+ Gold Certified Semi-Modular ATX Power Supply ($76.59 @ SuperBiiz)
Operating System: Microsoft - Windows 10 Home Full - USB 32/64-bit ($102.99 @ SuperBiiz)
Total: $1434.20
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-09-26 14:56 EDT-0400

Second Build
PCPartPicker part list: https://pcpartpicker.com/list/N6XWFd
Price breakdown by merchant: https://pcpartpicker.com/list/N6XWFd/by_merchant/

CPU: Intel - Core i5-6600K 3.5GHz Quad-Core Processor ($228.98 @ Amazon)
CPU Cooler: Cooler Master - Hyper TX3 54.8 CFM Sleeve Bearing CPU Cooler ($20.99 @ NCIX US)
Motherboard: Gigabyte - GA-H110M-S2H Micro ATX LGA1151 Motherboard ($61.98 @ Newegg)
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-2400 Memory ($154.99 @ Amazon)
Storage: Samsung - 850 EVO-Series 250GB 2.5" Solid State Drive ($98.94 @ OutletPC)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ Amazon)
Video Card: Gigabyte - GeForce GTX 1070 8GB Founders Edition Video Card ($500.00)
Case: Corsair - Carbide Series 88R MicroATX Mid Tower Case ($54.99 @ Amazon)
Power Supply: Corsair - VS 650W ATX Power Supply ($110.00)
Operating System: Microsoft - Windows 10 Home Full - USB 32/64-bit ($102.99 @ SuperBiiz)
Total: $1393.85
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-09-26 13:59 EDT-0400