I will upgrade my RIG little by little and I will start to buy first the proc(ryzen 3 2200g) and mobo(AsRock AB350M Pro 4). Am I able to use my existing 4gb DDR3 RAM without any problem.
Memory:Patriot - Viper 4 8GB (2 x 4GB) DDR4-3000 Memory ($89.99 @ Amazon) Total: $89.99 Prices include shipping, taxes, and discounts when available Generated by PCPartPicker 2018-06-16 01:57 EDT-0400
You don't want just the cheapest RAM you can find on a Ryzen, especially on a Ryzen APU.
Memory:Patriot - Viper 4 8GB (2 x 4GB) DDR4-3000 Memory ($89.99 @ Amazon) Total: $89.99 Prices include shipping, taxes, and discounts when available Generated by PCPartPicker 2018-06-16 01:57 EDT-0400
You don't want just the cheapest RAM you can find on a Ryzen, especially on a Ryzen APU.