Upgrading from a 580 GTX

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May 3, 2014
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I have a budget of 500$

My rig:
i7 990x @3.6ghz (6 cores, 12 threads)
Gigabyte g1 Sniper lga 1366 mobo
16gb Kingston DDR3 @1600mhz
250gb intel SSD
Antec 650W PSU
Asus Direct CU2 580 GTX

I don't upgrade frequently, I know the 1366 socket is pretty dead, but I am wondering what modern day graphics card I can run without being bottle necked by my CPU. I'm interested in a three monitor setup, I don't go higher than 1080p on single monitor. I don't think my PSU can handle a second 580, so I was leaning towards a 690GTX since its a dual gpu.

I had AMD/ATI cards in crossfire on my other rig, so I am open to either brand. I would just like suggestions to what the best I can get within my budget from people rather than hardware specs.