best build for under $400 (no GPU needed)

[R4DIO4CT1VE]

Friend of mine has access to a GTX 980, what is the best system he can build to put it in for under 400 USD?

I found a craigslist PC with a XEON 1231 v3, 8gb ddr3, 500w PSU, and everything else but a SSD for 325 USD, can anything beat this.

Mainly for playing PUBG, CSGO, Overwatch.

 

[vapour]

PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 3 1200 3.1GHz Quad-Core Processor ($109.77 @ OutletPC)
Motherboard: ASRock - AB350M Micro ATX AM4 Motherboard ($59.99 @ Newegg)
Memory: ADATA - 8GB (2 x 4GB) DDR4-3000 Memory ($83.99 @ Newegg)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($43.78 @ OutletPC)
Video Card: EVGA - GeForce GTX 980 4GB Hybrid Video Card (Purchased For $0.00)
Case: Thermaltake - Versa H21 ATX Mid Tower Case ($36.99 @ SuperBiiz)
Power Supply: Corsair - CXM 550W 80+ Bronze Certified Semi-Modular ATX Power Supply ($54.99 @ Amazon)
Total: $389.51
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-11-09 10:33 EST-0500

AM4 is new socket, last longer

 

[sadams04]

The Ryzen 1500X or Intel i3-8100 are your better options for an entry level build like that..

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i3-8100 3.6GHz Quad-Core Processor ($128.49 @ OutletPC)
Motherboard: MSI - Z370-A PRO ATX LGA1151 Motherboard ($109.89 @ OutletPC)
Memory: G.Skill - NT Series 8GB (2 x 4GB) DDR4-2400 Memory ($80.99 @ Newegg)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($43.78 @ OutletPC)
Video Card: EVGA - GeForce GTX 980 4GB Hybrid Video Card (Purchased For $0.00)
Case: DIYPC - DIY-BG01 ATX Mid Tower Case ($29.96 @ Newegg)
Power Supply: SeaSonic - S12II 520W 80+ Bronze Certified ATX Power Supply ($37.99 @ SuperBiiz)
Total: $431.10