That's product differentiation: 32 bits is enough for mass market gpus for gamers. They figure the scientific computing market has more money, so they charge a

That's product differentiation: 32 bits is enough for mass market gpus for gamers. They figure the scientific computing market has more money, so they charge a ton extra if you want decent 64 bit, even though it's basically the same hardware. AMD Radeon VII is an exception to that, no longer made but not really obsolete yet, and you can still find them.