Though I wouldn't aim for the specs from past 10 years, even though mine and most are like this. That would make sence if the game itself was released 10 years ago, but the engine is more than 25 years old. It wasn't supposed for open areas, but even 1 Gb of GPU should be enough to handle almost any open area kz map that was optimized properly. So wpoly check should be made anyway if you do anything more complicated than two blocks in a box.