Bootcamp Partition Sizing

I'd go probably 50GB. I don't have much on my bootcamp partition (a few old and small games, and office and it's at 33GB used, so I think you would probably need more than me.

 

i went with a 50gb partition and run about 5-6 games like star wars KOTOR, age of empires 3 and a few others, but thats all i use bootcamp for so i'd say that will probs be enough for you too

 

i'm sure that you are aware but i figured i'd mention not forget to account for the amount of space that the os itself takes up. also, some games vary in size by a large amount so it depends on what specific games that you want to run in order to determine a more accurate partition. i am not sure what is a comfortable amount of space for you in terms of your mac os partition but if you are comfortable with 400+gb then i would go around 70-80gb for the windows partition.

if you have specific games that you want to install though that aren't very large, then of course around a 50gb partition as others have suggested would suffice. good luck to you with your decision.

 

Very good point my mistake for forgetting something so obvious OP, not to be patronising, but if you check the game boxes of any games you want to install, it will tell you the required HD capacity for the game, add that up and allow a few GB for the OS, and i wouldnt leave anything less than 10GB more after that for save files and maybe a program or two and maybe even a game at a later date.. don't just take a wild shot in the dark with it