GFX card suggestions

Hardware Hub GPU
1

I am a PC, and Console gamer. I am looking into building a new rig. I already know that I am going for a i7 extreme, 32GB of high speed ram, and a sli config, maybe even 4 gfx cards in a dual sli. I cannot make a decision for my GFX card, I want something easily overclockable, that can also do video editing as well as 4k resolution on gaming, Not sure if openCL, or CUDA tech would be better. 

On a side note anyone know of a way to hook the PS4 DUALSHOCK 4 to the PC with a Xinput that properly emulates the Xbox controller, because most ways I have tried the left analog stick is inverted, and I have to reload the Xinput, and the game again for it to work properly. 

2

2 Titan-Z's or R9 295X2's.

3

amd will have the best 4k performance.

4

On the DS4 Controller thing: Try this http://forums.pcsx2.net/Thread-XInput-Wrapper-for-DS3-and-Play-com-USB-Dual-DS2-Controller

Or failing that this is a fork of it: http://forums.pcsx2.net/Thread-DS4-To-XInput-Wrapper

5

Thank you guys. One other question, for my retro games, what is your opinion on the Hyperkin "Retron 5"

I have read the reviews, and some say it is wonderful, some say it has issues with certain Genesis. and Gameboy games, and that saving data on the console is good, but putting the data back onto the cart itself does not work. According to Hyperkin they plan to fix this in there next firmware update. So should I get it now or wait until the Firmware update is out.