If you're budget constrained, a cheaper card will still get you massive improvements. I'm on a gtx 970, and it far outstrips the cpu. Even a gtx 650 (about £65)

If you're budget constrained, a cheaper card will still get you massive improvements. I'm on a gtx 970, and it far outstrips the cpu. Even a gtx 650 (about £65) should outperform a cpu.