Just be careful not to go above what you can get directly to the modem. Maybe even go a little below that. Remeber, this isn't telling your internet how fast it can go, this is telling your router how to manage data so it can go onto the WAN and not get a "speeding ticket" aka heavy throttling and have QoS suffer causing latency. In gaming, latency is more important then speed, so play around with that number and test out online gaming.