Looking to upgrade from (x2) gtx 660ti (sli)

[sin4life2000]

currently running x2 660ti SLI graphixs cards.
Im looking to upgrade since SLI has so many problems i would like to move to a single card.
Was trying dying light today, wile running OBS and trying to do multiplayer and was having horrible problems.
Anyone tell me a amazing upgrade? i was reading up on the gtx970. Or anything better?
Willing to drop around 400-500

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System Specs
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MOTHERBOARD: (3-Way SLI/CrossFireX Support) ASUS P9X79 Pro Intel X79 Chipset
Quad Channel DDR3 ATX w/ BT GO, SSD Caching, 7.1 HD Audio, Intel GbLAN, 4 Gen3
PCIe x16 & 2 PCIe x1
Processor: Intel core i7-3820 CPU @3.60ghz
POWER SUPPLY: 850 Watts - Thermaltake Smart Series SP-850M 80 Plus Bronze Modular
Power Supply
VIDEO: NVIDIA GeForce GTX 660 Ti 2GB 16X PCIe 3.0 Video Card (EVGA
Superclocked
VIDEO2: NVIDIA GeForce GTX 660 Ti 2GB 16X PCIe 3.0 Video Card (EVGA
Superclocked
CD: 24X Double Layer Dual Format DVD+-R/+-RW + CD-R/RW Drive
CPU: Intel(R) Core™ i7-3820 Quad-Core 3.60 GHz 10MB Intel Smart Cache LGA2011
(All Venom OC Certified)
FA_HDD: None
FAN: Asetek 550LC Liquid Cooling System 120MM Radiator & Fan (Advanced Cooling
Performance + Extreme Silent at 20dBA) (Single Standard 120MM Fan)
FLASHMEDIA: INTERNAL 12in1 Flash Media Reader/Writer
Core™ i5 based PCs [+0]
HDD: 2TB (2TBx1) SATA-III 6.0Gb/s 64MB Cache 7200RPM HDD (Single Drive)
HDD2: None
IEEE_CARD: None
IUSB: Built-in USB 2.0 Ports
MEMORY: 16GB (4GBx4) DDR3/2133MHz Quad Channel Memory (G.SKILL Ripjaws)
NETWORK: Onboard Gigabit LAN Network
OS: Microsoft(R) Windows 8 (64-bit Edition)
SOUND: HIGH DEFINITION ON-BOARD 7.1 AUDIO

 

[rtware923]

Not a solution but a question:

I also have a similar set up and was trying to find out how I would do running the game. How is your single player performance and what kind of frames do you get at what setting level?

 

[RobCrezz]

970/980 would be the way to go!

 

[lyle08]

Not a solution but a question:

I also have a similar set up and was trying to find out how I would do running the game. How is your single player performance and what kind of frames do you get at what setting level?

I may be able to help I have 2 evga 660ti sc+3gbs, an intel 3770k at stock speed currently, 8gb ram, and an overclockable 1440p monitor dsr'd to 3840x2160. I've mainly been testing games focusing on 4k and framerate because with the newer games I can't do extra graphic effects like ambient occlusion or even good antialiasing sometimes or else the game drops to 30 fps or lower. On dying light I get 40-50 fps dsrd to 4k with card based AA and maybe one other low resource using effect. For some reason the game runs at about the same fps at 1080p on ultra only with more... I forget what it's called stuttering? when parts of the screen don't update. I had hoped it would run it better on ultra without 4k.

970/980 would be the way to go!

Would you happen to know what kind of power supply 980s in sli require? Or I actually have the same question as the op I've been thinking about upgrading and waiting for the 980 8gb or ti versions. Also would those things effect their power requirements if you have any idea?
Edit: Also I miss having an accessory monitor and would like to run that again its just at like 1280x960 or something and most games don't like it.

 

[RobCrezz]

Each 980 requires about 171w. A good 500w psu is fine for one, a good 650w for 2, but you can go to 750w if you want some headroom.

The 780ti/titan replacement chip will likely be around 200-250w each. Likely to be the GTX 1080 or named something like that.