I'm considering upgrading my GPU from a gt 740 to a gtx 1070, its an EVGA ACX3.0 Black edition 08G-P4-5171-KR, and I'm wondering if it would work with my Z87-PRO motherboard? Would I be better off upgrading my CPU instead ( i5-4690 ), I mostly use my pc for playing games, and want to be able to run the newer ones well, any suggestions on other GPU/CPU upgrades? Thanks