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Making Pc For friend.

Solution
If he will be using the PC for gaming the i7 is overkill. If he is not using applications which benefit from additional cores (i.e. rendering/photoshop etc) the i5 is a better option. Games utilise 4 core maximum (with couple of exceptions). I always feel (with a gaming build) the money is better spent elsewhere (i.e. better gpu or faster storage)

Could save some money and buy an i5 and spend the cash saved on either additional fans or (more importantly) more ssd storage. You will get a better performance increase with an M.2 boot drive than you will from an i7 (over an i5).

Other than that, looks like a good build. What resolution your friend using? If he is only interested in 1080p then I might suggest a different GPU also (however...
If he will be using the PC for gaming the i7 is overkill. If he is not using applications which benefit from additional cores (i.e. rendering/photoshop etc) the i5 is a better option. Games utilise 4 core maximum (with couple of exceptions). I always feel (with a gaming build) the money is better spent elsewhere (i.e. better gpu or faster storage)

Could save some money and buy an i5 and spend the cash saved on either additional fans or (more importantly) more ssd storage. You will get a better performance increase with an M.2 boot drive than you will from an i7 (over an i5).

Other than that, looks like a good build. What resolution your friend using? If he is only interested in 1080p then I might suggest a different GPU also (however I do like the 1070, have one myself). If I was gaming at 1080p, personally I wouldn't buy a 1070.
 
Solution

How about this https://pcpartpicker.com/list/cDT9XH
 
I've edited one of the rigs here listed for better cooling / OC / storage to this:

PCPartPicker part list: https://pcpartpicker.com/list/q8VTVY
Price breakdown by merchant: https://pcpartpicker.com/list/q8VTVY/by_merchant/

CPU: Intel Core i7-6700K 4.0GHz Quad-Core Processor ($279.99)
CPU Cooler: CRYORIG H7 49.0 CFM CPU Cooler ($34.88 @ OutletPC)
Motherboard: ASRock Fatal1ty Z170 Gaming K4 ATX LGA1151 Motherboard ($139.81 @ OutletPC)
Memory: G.Skill Ripjaws V Series 16GB (2 x 8GB) DDR4-3000 Memory ($99.99 @ Newegg)
Storage: Samsung 850 EVO-Series 500GB 2.5" Solid State Drive ($169.99)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.33 @ OutletPC)
Video Card: EVGA GeForce GTX 1070 8GB SC GAMING ACX 3.0 Black Edition Video Card ($379.99)
Case: Cooler Master MasterBox 5 (Black) ATX Mid Tower Case ($46.99)
Power Supply: EVGA BQ 600W 80+ Bronze Certified Semi-Modular ATX Power Supply ($55.98 @ Newegg)
Total: $1256.95
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-02-21 09:15 EST-0500