Tight budget 'upgrading' from i7-950 to i3-7350k for gaming viable?

[Krokottas]

Hey, I'm trying to 'justify' wanting to buy this specific processor, right now I'm running an old i7-950 with two HD 7970 cards for gaming.
The thing is, right now, money is tight and my system keeps telling me, even with a new PSU, that the voltage over the 12v line is going up to 14.5v, so I there's a flaw somewhere.
Seeing the motherboard, CPU and memory are all almost 6 years old, I figured I could go for some new hardware.

Right now, I'm looking at the i3-7350k, but I'm not exactly sure what to look for in a new processor, and I would like to know, is it a good buy, for it's price?
Am I going to notice a big difference in performance when I'm going to play games when, say, comparing it to an i5?
I used to know these things, but technological features have gone beyond my scope of knowledge at this point and I could use some help.

Considering that, ideally, I'd like to keep my HD 7970's for as long as they do their job proper, what would be a good current or previous gen processor to upgrade to for a reasonable budget?
The i3-7350k costs €150 in my country right now (€100 cheaper than an i5-7600k), and compatible memory (4x4GB DDR4) and a Crossfire supported motherboard would set me back a total of €350, when I buy them brand new.
I'm also not looking for second hand stuff, so I'm not going to base my budget on that.
I'm also going to recycle as much functioning equipment from my old PC.

tl;dr: For €350, would the i3-7350k be a 'good enough' budget upgrade for games like GTA Online, For Honor, Ark - Survival Evolved or similar games, or are there more viable options to be found in earlier (or the same) generations of processors for a the same price tag?

PS: Sorry for bad English, not a native speaker.

 

[tanckattb]

The i3-7350k has been ripped by many tech youtubers, deemed to be a cpu that isn't worth the money. It does offer an unlocked multiplier, but intel prices it almost like an i5. Buying the i5 would give you much better gaming performance than the i3-7350k, even when overclocked. Anyway, to be able to take advantage of the unlocked multiplier of the i3-7350k, you need a chipset that supports overclocking, which would be a Z270 board, and a beefy cooler. The added additional costs make it a terrible buy.
If you were going for an i5 with two 7970s in crossfire, you would get a decent amount of fps, and maybe still play at high settings.
If you want to keep your Budget with the 7970s, I'm afraid that they will soon have to go. In a year or two, you would have to sadly start searching for a replacement.
You're in luck tho, Nvidia is releasing Volta in a couple months or two, and and is releasing vega.