slow hdd

This is my first time on this forum, but it's because I really need help. My 4TB relatively new HDD (Seagate Barracuda) has began failing on me! Recently it started making the system unable to boot once it was plugged in through SATA. To get past this issue I ran the system without it, went into...

I currently have a gtx 750 ti oc edition and a friend is selling his r9 280x for cheap. So at most I'm looking at like 30-40 bucks after I get rid of the 750. Is that worth it for the upgrade or would I be better off sticking with the 750 a little longer? Thanks!