If we're counting integrated graphics in this, then AMD probably ain't anywhere close to being in 3rd. Between AMD and Intel, AMD's at around 35-40% of the CPU market (per https://www.statista.com/statistics/735904/worldwide-x86-int...), and most of those are probably going to be APUs or otherwise have an integrated GPU.
I can't find any solid numbers on the percentage of PCs with dedicated GPUs, but I'd be very surprised if it was anywhere near that figure.
I can't find any solid numbers on the percentage of PCs with dedicated GPUs, but I'd be very surprised if it was anywhere near that figure.