AMD Zen CPU Architecture
AMD changed the CPU game with its Zen CPU architecture in 2017, and has since actually turned things around for the company and its decades-long battle against Intel. AMD is now kicking some Team Blue ass, with the Zen architecture and successor in Zen 2 being baked into the Ryzen, Threadripper, and EPYC families of CPUs. AMD should be truly commended with the Zen architecture, turning the entire company around in a flash.
Nintendo had a phenomenal time with the original Wii console, but the WIi U was a big mis-step for the Japanese giant -- which quickly recovered itself with the 2017 release of the Switch. The Nintendo Switch was a portable console that could be docked at home on the TV, but it was the fact that it was a kick ass portable gaming device that saw 10s of millions falling in love with it. Hell, I purchased one solely to play The Legend of Zelda: Breath of the Wild on and I loved every minute of that.
There really needs to be no more said about Fortnite, which like Pokemon GO (and even Minecraft) changed the gaming world. It spawned 10s of millions of gamers, was a viral sensation and took Epic Games to never-before-seen heights in terms of success. The Unreal Engine-powered game also saw the careers launched of countless streamers and esports starts since.
RGB LEDs in PC
2017 was the year of RGB LEDs in gaming PCs and it hasn't stopped really... at first it was a kind of joke but now I don't think I'd want to build a new PC without RGB lighting inside. It was something that... at least at first, mocked but then matured and turned into something that actually makes the PC gaming experience something that can also look great, too.
AMD: Vega GPU architecture
AMD launched its Vega GPU architecture packed with on-board HBM2 memory in 2017, it couldn't compete with NVIDIA and its kick-ass Pascal GPU architecture (and GDDR5/5X memory at the time) but from a technological perspective the Vega GPU and HBM2 technology was an impressive feat for AMD.
AMD Ryzen Threadripper 1000 Series
AMD offering a then-insane 16C/32T processor for $999 in the Ryzen Threadripper 1950X was just unheard of, and changed the HEDT platform game in an instant just as big as the original Ryzen CPUs in the months earlier. AMD's success here with the first-gen Ryzen Threadripper CPUs only continued throughout 2018 and 2019 with even more cores, threads, and speed.