In general, as much as you can give it. Ventilation is key for getting rid of the heat generated by your PC’s CPU, and when you’re gaming, it can get pretty hot. If you leave a PC in cramped quarters or in an area with restricted airflow, your computer won’t be able to cool off as quickly and performance will suffer. There are plenty of creative ways to set up a PC with a gaming desk so that it gets maximum airflow, and a lot of it depends on which way the exhaust fans are pointing. Before you buy a gaming desk, make sure that it will work to keep your computer ventilated.