Ryzen or Intel?

[jaredchin2003]

I want to build a new pc using some old parts and some new ones. I was thinking about getting a ryzen 3 1300x and a new motherboard but then I realized I have ddr3 RAM. I don't know if I should buy new ram for the ryzen cpu or keep this ram and buy an older Intel cpu and an older motherboard. Can anyone help me please? Thank you.

 

[Dark Lord of Tech]

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i3-8100 3.6GHz Quad-Core Processor ($125.45 @ Amazon)
Motherboard: MSI - Z370 GAMING PLUS ATX LGA1151 Motherboard ($106.98 @ Newegg)
Memory: G.Skill - Ripjaws V Series 8GB (2 x 4GB) DDR4-2666 Memory ($92.99 @ Newegg)
Total: $325.42
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-02-03 19:03 EST-0500

or

PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 3 1300X 3.5GHz Quad-Core Processor ($124.88 @ OutletPC)
Motherboard: Gigabyte - GA-AB350-GAMING 3 ATX AM4 Motherboard ($70.98 @ Newegg)
Memory: G.Skill - Ripjaws V Series 8GB (2 x 4GB) DDR4-3200 Memory ($103.99 @ Newegg)
Total: $299.85
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-02-03 19:05 EST-0500