Migrating from 1080p to 1440p Gaming: Need some advices

Hello, finally, after 7 months of hard work saving pocket money and additional save ups from work already begun my transition from 1080p to 1440p gaming (yay!) Happy! However, I ran into some issues regarding what hardware upgrades I should take. First let me clarify what I have:
-i7 4770 (3.4 GHz)
-8 GB DDR3 (800Mhz) RAM
-GeForce 1050 Ti (4GB)
-MSI B85M-E33
-550w PSU (don't know the brand, but for sure it's none of the famous circle)
What I am intending to have is i7 4770 paired with 1070, 16 GB RAM DDR4 (2666 Mhz (yes I am not taking 3000 or 3200 version unless it's a neccesity ), 650w PSU. I am fully unaware of motherboard trendings, is mine good or should I change to newer (as of BIOS firmwares)? And what about bottlenecks between 4770 and 1070? I digged quite deep and heard many positive responses that those two work just fine, although some bottlenecks from time to time might occur? Any response is always cheers in advance!

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Bottlenecks are quite rare. Examples:

Long ago Tomshardware found the run of the mill i5-2500 could run a trio of GPU without bottlenecks. You have one GPU and a much newer board and CPU. There should no issue here.

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First....that mobo does not support ddr4 ram.
What you want is ddr3 2x8GB @ 1600.

So change that over and test to make sure everything functions.

If your going to start climbing the gpu ladder we will need to know the make and model of the psu.

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Yeah, I am in search for new mobo. Planning to purchase Corsair ATX VS Series 650w PSU. What is currently decent and not overly priced mobo that would fit 2x8 GB 2666?

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Your cpu does not support ddr4.

Forget this mobo and ddr4 upgrade stuff.

Keep it simple!!

Just bump the ram out as I mentioned above and test.

Then you move into the gpu upgrade area.

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your mobo dosen't support ddr4 memory and bottlenecking is not an issue with that cpu and gpu
you search for a new mobo is useless because your 4770k only supports ddr3 memory
better you sell your pc and buy something equivalent to this -

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