Unfortunately, I was unable to respond to the running thread in defense of my suggestion so I'll sum it up here and I'm not going to quote the entire thread as it's getting quite long, but here's the bottom line. I've been building computers for personal use and for my customers for over 15 years. I personally have owned an A10-5800K, A8-5600K and have sold 4 systems with the A8-5600K in 2014 and 2015. I have no and I've received no complaints, and this includes running games such as DayZ, Arma III, WoW, WoT, WoWarships, America's Army, and many others.
An A8 or an A10 won't be as powerful as say an i5-7600K for gaming, but the A8 and other parts I referenced, all together, are cheaper than the i5-7600K. And, while my suggestion isn't future proof (but no real computer system is with how quickly technology can change on us), it's a nice buffer between an old system that's bordering obsolete and a brand spankin' new system that'll cost $1,000+.
Now, if I'm not mistaken, the main point of this post was a budget friendly alternative to an aging dual-core processor with knowledge of having to buy new a Motherboard and RAM and the desire to have a quad-core system. I believe my response supports that (as well as allowing the OP to move their current GTX 970 along with it). And, for less than $175 total, it won't disappoint.