Right, at the moment and that game changes all the time. However, we're talking share here where 5 out of top 10 are Nvidia (which also changes, yes - and not in favor of AMD but those "other" systems which are mostly under sanctions and can't buy Nvidia at scale). Top five accelerators / co-processors in TOP500 are Nvida per https://en.wikipedia.org/wiki/TOP500 . If you ask Nvidia they'll tell you 64-68% of TOP500 are Nvidia, but they count interconnect as well, not just GPU. Truth is somewhere down, probably within 1/3-1/2 area. It's really not hard to see AMD is putting up a fight, but against a giant. Nvidia outclassed AMD's sales in b2b as well as towards consumers by a big margin which is reflected both in revenue and ultimately market cap. Reason why that's so, since both are fabless, lies primarily within R&D Nvidia did execute on rather well - but that's just like my opinion, man. Everything else are facts.