The 76ers also received huge games from Samuel Dalembert and rookie Willie Green. Dalembert had 18 points, 18 rebounds and five blocks before fouling out in overtime while Green scored a career-high 26 points.
After McKie carried the Sixers in the fourth quarter, Snow made all the key plays in overtime. Snow's driving layup with 37 seconds left provided a 101-98 lead and, after Travis Hansen made two free throws for the Hawks, Snow hit a jumper over Bob Sura with 8.6 seconds remaining.
Sura missed a three-pointer as time expired for the Hawks.
Philadelphia (33-45) is 2 1/2 games behind Boston for the Eastern Conference's final playoff berth with four games left.