G3258 to 4690k

[Telecaster]

I have a Pentium K in my system that I bought a while ago as a place holder until I'd decided what to do. I run it at 4ghz, I have had it up to 4.7 but I passively cool it so I settled on 4 as it doesn't seem to make much gaming difference.

I eventually decided to go for a 4690K with the potential to undervolt it and still run it at 4ghz like the Pentium, with the assumption it would be the better chip long term.

I've had it sat here a week or so and it hasn't been out of the box, granted I'm waiting on another heatsink to arrive before I started testing, but I haven't felt the need to break into it and install it anyway, question is am I likely to get any increased gaming performance if both chips are at the same speed?

I'm seriously considering just sending it back and sticking with the G3258, gaming performance with my 970 doesn't seem to be suffering from a dual core, at least on the games I have installed at the minute:

Sleeping Dogs
Tomb Raider
Dirt 3
Thief
Far Cry 3
Hitman Absolution

All the above don't seem to care about CPU performance, so what's the point?

Do I keep the 4690K or send it back and have £160 in my pocket?

 

[Telecaster]

You have to expand on that, I play at 1200p with V sync on and all the above games I mentioned run at 60fps with the G3258.

So what will I gain from the 4690K that I am missing at the moment?

 

[Telecaster]

Especially with skylake coming

My Z97 board is barely a few weeks old, I probably won't be bothering with Skylake.

Can someone give me a list of current or games coming very soon that will need 4 cores or more?