Just upgraded my eldest sons Pentium (2 core craptacular) to a ryzen3 1200. Still kept the r9 270 and I was very surprised with how well windows managed the changeover. A couple of false starts until it recognized the different CPU and motherboard then all I had to do was manually install the network adapter driver.
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Canada EH, for the games he plays the 1200 will last at least 3 years. Also he only has an r9 270, so going any bigger on the CPU wouldn't have netted any real benefits. We also have a few other computers in the house that could use the 1200 (my nas and game server) should we decide to upgrade his CPU again in a few years.