OEM types arent that bad but its a lottery if you are already using it and has been working for you for a year or so then it shouldnt be a problem also if its a 650W one or more if you havent had it for that long just dont lottery that gtx970 and get yourself a Evga (superflower) PSU or a good branded one so you are safe (note dont assume that Corsair is a good PSU brand you will regret it if you are unlucky)