Recognizing slot machine volatility. The risk involved with a specific machine is known as volatility; slots with low volatility typically pay out smaller sums mslots for moneyore frequently, whereas those with high volatility offer larger payouts but fewer wins. Gamers should determine how much risk they can take and select machines that suit their gambling preferences. RTP (Return to Player) percentage. When selecting a slot machine, the RTP percentage is yet another important consideration.