How's this build?

[pcbuilder01]

CPU: Intel Core i5-8400 2.8Ghz
MB: Gigabyte - B360M DS3H Micro ATX LGA1151 Motherboard
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory
Storage: SanDisk - SSD PLUS 120GB 2.5" ; WD- Caviar Blue 1TB 3.5" 7200RPM HD
GPU: EVGA - GeForce GTX 1070 8GB SC2 Gaming iCX Video Card
Case: Corsair - 270R ATX Mid Tower Case
PS: Corsair - CXM 650W 80+ Bronze Certified Semi-Modular ATX
Windows 10
I want to run games at mostly high settings. Budget is around $1000

 

[vapour]

Only issue is SSD too small, downgrade your ram to 2400 or 2666 since B360 can handle 2666 max, spend the extra on a 250 gb ssd.

 

[Finstar]

I'd rather go with Ryzen 5 2600 or 2600X
Bigger SSD from a more reputable brand wouldn't hurt either.
That motherboard also only supports memory speeds up to 2666MHz.

 

[feelinfroggy777]

It is a good build. You wont have a problem running games at high settings. 120gb SSD is not going to hold much more than the OS. Down the road you may wish you had gotten a bigger one. You can get a budget 250gb SSD for around $50.

You don't need a 650 watt PSU for that rig. A good 550 watt will do the trick. The Corsair CXM is not the best PSU corsair has in their lineup, but it is not terrible either. If you have some room in your budget I would look for a EVGA G2/G3, Seasonic Focus Gold, Corsair RM or Corsair Tx. Those are all excellent PSUs.

 

[Finstar]

My recommendation:

PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 5 2600 3.4GHz 6-Core Processor ($170.98 @ Newegg Business)
Motherboard: ASRock - B450M PRO4 Micro ATX AM4 Motherboard ($81.98 @ Newegg)
Memory: G.Skill - Ripjaws V Series 16GB (2 x 8GB) DDR4-3000 Memory ($149.99 @ Newegg)
Storage: Crucial - MX500 500GB 2.5" Solid State Drive ($97.85 @ OutletPC)
Video Card: EVGA - GeForce GTX 1070 8GB SC2 Gaming iCX Video Card ($409.89 @ OutletPC)
Case: Corsair - 270R ATX Mid Tower Case ($59.99 @ Amazon)
Power Supply: EVGA - SuperNOVA G3 550W 80+ Gold Certified Fully-Modular ATX Power Supply ($39.99 @ B&H)
Total: $1010.67
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-07-24 15:09 EDT-0400

 

[pcbuilder01]

Only issue is SSD too small, downgrade your ram to 2400 or 2666 since B360 can handle 2666 max, spend the extra on a 250 gb ssd.

any recommendations for a different motherboard?

 

[vapour]

Z370 is expensive and overkill for locked 8400.

 

[feelinfroggy777]

Only issue is SSD too small, downgrade your ram to 2400 or 2666 since B360 can handle 2666 max, spend the extra on a 250 gb ssd.

any recommendations for a different motherboard?

I would stick with the Gigabyte - B360M DS3H. It is a good pairing with the 8400 and you don't need to worry about RAM speed. There will be no performance difference with 2666mhz RAM and 3000mhz RAM. So no need to spend extra on a Z370 board for something that wont give you better performance.

If you already have the RAM, then it is just fine. It will run at 2666 natively. Just to save cost, typically 3000mhz RAM cost more than 2666mhz.