71C isn't bad at all, well within safe limits. GPUs will also throttle themselves when their getting critical temps. Highest I've ever seen one of my GPU cards was my Radeon HD 6990 when aircooled. It would run about 90-94C in Dragon's Age II, yet ran fine. I didn't like this at all, and even manual fanspeed adjustments didn't lower it much, without sounding like a jet engine spooling up at least. This is what got me back into watercooling again. After converting to watercooling, the same card, same game, temps never went over 53C.