Stuttering lag with GTX 760?

I rececently just bought a GTX 760 and all the games I play are fine even on highest graphics (Such as Crysis 3 in 1080p and 50fps) although whenever I turn around or walk it starts to stutter On minecraft with my old graphics card a GT 620 I would have no stutters at all and good fps, but now I get over 120fps but it stutters everytime chunks load specs: Gpu: gtx 760 amp edition Cpu: AMD a8 5500 apu with Radeon Graphics 3.2GHz Ram: 8GB Motherboard: MSI MS-7778 How would I fix this? :l