Question Best appropriate gpu for i5 4690k 4.3ghz

I say buy the best GPU NVidia GTX 1070/1660ti or faster that you can afford, it will still be useful in 2-4 years when you decide to upgrade the CPU/Motherboard/RAM.
I'm not much of a gamer I do have several older games and so my AMD R5-1600 @ 3.9GHz and EVGA GTX 950 FTW 2GB are still fine for me as I run a 1080p 60Hz display. I haven't decided to OC the GPU yet but I can easily get another 15% out of it.
 
At 1080p, the gtx 1660ti. Going beyond that is pretty much wasted except for a few games. Fps will be cpu limited and at 1080p there shouldn't be much issue maintaining 60Hz minimums ±

Can't triple channel ram. That died with lga775/1366 pretty much. OP is running dual channel. If he was running 1x8 and 1x4, that'd be dual-flex mode, the first 4Gb (of the 8Gb stick) in dual channel with the 4Gb stick, the remaining 4Gb in single channel.
 
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Ok I have a 4670k @ 4.3Ghz which is a near identical cpu. There are many modern AAA games this cpu sees dips under 60fps due to the cpu maxing out, this is to be expected with a quad core these days.

Therefore gpu choice will dictate what game detail settings you can run but your FPS in modern AAA games is going to be determined by the cpu with most GPU pairings.
 
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For almost all games, using ddr4, there's very little, to no, difference between single channel and dual channel ram (for Intels) since the game doesn't saturate the ram bandwidth. Dual channel doubles single channel bandwidth, but if you don't even use half, then they are the same. It's only on hyper extreme bandwidth use that there's upto @ 20% benefit with dual channel. Ddr3 has much smaller bandwidth capacity, so there's a higher probability in modern titles of dual channel usage showing a benefit.

Part of the reason triple channel was abandoned, the interleaving in triple is used sequentially, not in parallel, so you didn't get to use the bandwidth on the 2nd stick until the first stick was saturated.
 
There's no perfect pairing, every games requirements is different. If a cpu is capable of 100fps in one specific game, all that's required to max out details is a gpu strong enough. Going stronger does nothing, you won't raise the fps, that's set by the cpu, you'll just have an excess of gpu power. If the gpu isn't strong enough, can only do 80fps, you lose that 20fps as the gpu can't sustain the fps the cpu gives it. However, that's at that game, you could always play a different game, where the cpu is maxing 60fps, in which case that weaker gpu is now plenty strong to max fps.

So it's a constant balancing act between cpu fps output and gpu ability to reproduce the fps. And it's totally game dependant as to which way the balance tips. With a card like a 2080/ti, the balance is heavily weighted in gpu favor to start with, so choice of game is mostly moot, there's only 1 game I can think of that'll hurt even that card at 1080p. But for 99.9% of all other games, that gpu will still be half asleep and still max out details, seriously over powered for 1080p.

The gtx1660ti has replaced the 1070 in nvidia lineup as top end 1080p card, the 1070 is pretty much no longer produced. With a price difference of $280 vs $420, it's a really bad buy now.
 
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What is the best suitable gpu for i5 4690k at 4.3 ghz?
Don't worry about price
I presume this is for gaming.
A balanced gamer will budget about 2x the cost of the cpu for the graphics card.
By that metric, a GTX1660 or GTX1660ti would be appropriate.

But, since you are not concerned about price, you can go stronger.
Particularly if you favor fast action games or will play in higher resolution monitors.
The strongest today will be the RTX2080ti.
Considering the price of that card, one would be better off changing out the cpu and using a more modest graphics card.
 
At 1080p, the gtx 1660ti. Going beyond that is pretty much wasted except for a few games. Fps will be cpu limited and at 1080p there shouldn't be much issue maintaining 60Hz minimums ±

Can't triple channel ram. That died with lga775/1366 pretty much. OP is running dual channel. If he was running 1x8 and 1x4, that'd be dual-flex mode, the first 4Gb (of the 8Gb stick) in dual channel with the 4Gb stick, the remaining 4Gb in single channel.
My motherboard is h81m asrock