Question What PSU?

this:
PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 5 2600X 3.6 GHz 6-Core Processor (€189.99 @ Amazon Italia)
Motherboard: MSI - B450 TOMAHAWK ATX AM4 Motherboard (€115.02 @ Amazon Italia)
Memory: Corsair - Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory (€111.98 @ Amazon Italia)
Storage: Intel - 660p Series 1 TB M.2-2280 Solid State Drive (€143.09 @ Amazon Italia)
Video Card: Gigabyte - GeForce RTX 2060 6 GB GAMING OC PRO Video Card (€447.99 @ Alternate Italia)
Case: Cooler Master - MasterBox MB520 RGB ATX Mid Tower Case (€75.99 @ Amazon Italia)
Power Supply: SeaSonic - FOCUS Plus Gold 550 W 80+ Gold Certified Fully-Modular ATX Power Supply (€92.90 @ Amazon Italia)
Monitor: AOC - C24G1 24.0" 1920x1080 144 Hz Monitor (€236.17 @ Amazon Italia)
Total: €1413.13
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-04-03 15:43 CEST+0200
 
this:
PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 5 2600X 3.6 GHz 6-Core Processor (€189.99 @ Amazon Italia)
Motherboard: MSI - B450 TOMAHAWK ATX AM4 Motherboard (€115.02 @ Amazon Italia)
Memory: Corsair - Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory (€111.98 @ Amazon Italia)
Storage: Intel - 660p Series 1 TB M.2-2280 Solid State Drive (€143.09 @ Amazon Italia)
Video Card: Gigabyte - GeForce RTX 2060 6 GB GAMING OC PRO Video Card (€447.99 @ Alternate Italia)
Case: Cooler Master - MasterBox MB520 RGB ATX Mid Tower Case (€75.99 @ Amazon Italia)
Power Supply: SeaSonic - FOCUS Plus Gold 550 W 80+ Gold Certified Fully-Modular ATX Power Supply (€92.90 @ Amazon Italia)
Monitor: AOC - C24G1 24.0" 1920x1080 144 Hz Monitor (€236.17 @ Amazon Italia)
Total: €1413.13
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-04-03 15:43 CEST+0200

Thank you