Hi im looking to upgrade my pc i have a amd a8 6600k and a unbranded gtx 750 ti and a 500 watt psu im looking on getting a gtx 970 graphics card but dont want to waste my money if not going to see the difference as i dont no how good my cpu is (noob) i can play most modern games 1080p medium settings and some on high at 900p will my cpu need upgrading soon thanks in advance ant