It's alright, the 9400 has decent gaming performance but I would say to take advantage of the sale prices on the high end ryzens.
PCPartPicker Part List:
https://fr.pcpartpicker.com/list/ptsCL2
CPU: AMD Ryzen 7 2700 3.2 GHz 8-Core Processor (€179.88 @ Amazon France)
Motherboard: ASRock Fatal1ty B450 GAMING K4 ATX AM4 Motherboard (€98.95 @ Amazon France)
Memory: Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3600 Memory (€99.89 @ Alternate)
Storage: Kingston A400 480 GB 2.5" Solid State Drive (€47.07 @ Amazon France)
Video Card: Zotac GeForce GTX 1660 Super 6 GB Twin Fan Video Card (€256.90 @ LDLC)
Case: Corsair Carbide Series 275R ATX Mid Tower Case (€67.98 @ Amazon France)
Power Supply: EVGA 500 W 80+ Certified ATX Power Supply (€46.90 @ Amazon France)
Total: €797.57
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-11-11 05:53 CET+0100