It means it's calculating 6000 frames per second, but all of them don't need to make it to the screen. On a 60hz screen, every 100th frame calculated would actually be displayed. (If we assume a perfect 6000fps, the video shows fluctuations between 4000fps-7000fps.
If you just mean how can it be so high in general? Old, well optimized, games run really well on faster modern hardware. I remember getting over 1,000 fps in Guild Wars 1 on a GTX 1060 when looking at an area with no monsters/NPCs.
edit( this paragraph doesn't apply here) ~~The PS1 also doesn't have floating point math, mostly everything is done in fixed point with integer math which is obscenely fast compared to floating point (it could also simulate an FPU if the precision is absolutely necessary but that's not suitable for realtime)~~
Just read further down the article that they converted it to float. I guess the game is just super optimized. I would have thought fixed point savings factored in here.
If you just mean how can it be so high in general? Old, well optimized, games run really well on faster modern hardware. I remember getting over 1,000 fps in Guild Wars 1 on a GTX 1060 when looking at an area with no monsters/NPCs.
edit( this paragraph doesn't apply here) ~~The PS1 also doesn't have floating point math, mostly everything is done in fixed point with integer math which is obscenely fast compared to floating point (it could also simulate an FPU if the precision is absolutely necessary but that's not suitable for realtime)~~
Just read further down the article that they converted it to float. I guess the game is just super optimized. I would have thought fixed point savings factored in here.