The server should be okay but the cliënt's have a problem. Their problems are beginning at 3.5gb ram usage. Stutters and hiccups black screens for a couple of seconds in garage setting (online) and finally it will stop working. For our league (27 participants) we have left out the driver suits and driver helmets to stay under 3gb ram, just to be sure. The in game circuit detail, texture detail and opponent detail are the biggest users of ram and should not be set at max, at most high is the setting to stay out of trouble. As long as you per client don't hit the 3.5 gb ram usage it should be okay.