New graphics card

Hi guys.

I currently have a GTX 560Ti 1gb running FSX / P3D, but i am getting stutters, and i have tried everything to no avail.

I am looking to upgrade to either a GTX 760 or a GTX 770 (4gb)

The question i have is will i see much improvement?

My system;

-Coolermaster 692 advanced tower

-Intel core i5 2500K 4.6ghz

-Corsair H100i watercooler

-GByte GA-P67A-D3-B3- MoBo

-8gb, 2x 4Gb ram

-2x 1TB SATA HDD

-650W NZXT Hale Gold Modular PSU

-1024mb Gainward GTX 560Ti Phantom 

There is 2 770s i am looking at and they are;

- http://www.amazon.co.uk/Gigabyte-Nvidia-DDR5-PCI-E-Graphics/dp/B00CU9GOAO/ref=sr_1_2?ie=UTF8&qid=1402736525&sr=8-2&keywords=GTX+770+4gb

and

-http://www.amazon.co.uk/Palit-Jetstream-Graphics-Architecture-Surround/dp/B00DB4J7LU/ref=sr_1_1?ie=UTF8&qid=1402736525&sr=8-1&keywords=GTX+770+4gb

Any opinions?

Cheers