GTA V 7770 Stuttering question

[ManaMou]

Hey guys i have a PC with an i5 4670,8GB of ram and a Sapphire 7770 Ghz edition.I play GTA V on 1080p with Medium textures wich surpass my 1Gb of Vram by a couple of megabytes but it still runs flawless on DX11 mode with 45+ FPS.However when i turn the textures on High i surpass my VRAM for about 700mb and while the game runs with the same exact framerate sometimes i get a little bit of stuttering in some places of the map.I know that it is because i dont have enough VRAM but because the problem is so minimal and the game still runs on the same framerate is there anything i can do to improve or fix it?I already overclocked my GPU to 1100mhz core clock and 1300mhz Memory clock.

 

[ManaMou]

No, The best value option is buy a 2 gig card with a bigger engine and sell the old one.
You cannot fix this. The 7770 is not really powerful enough for 1080p gaming in the first place.(never was)..
http://www.tomshardware.co.uk/gaming-graphics-card-review,review-32899-7.html
Sure, you got away with it a bit but even a 2 gig 750 T.I. card is faster. Time to invest,especially running a Haswel i5.
If there was a way in the current tech climate to make a $120 graphics card work like a $170 graphics card I guess we would have heard about it by now. (going by prices as were).
Something like this would do (from your area), if your power supply has the chops;
http://www.ebuyer.com/662154-powercolor-r9-285-2gb-gddr5-dual-dvi-hdmi-displayport-pci-e-graphics-card-axr9-285-2gbd5-tdhe?utm_source=google&utm_medium=products&mkwid=6AUw6wCM_dc&pcrid=51508054139&gclid=CNWv3sC7vcUCFTQatAodNm0A4Q

I have an upgrade in my plans but i cant afford it right now also my PSU is 650w is it enough for a 750 Ti?And is the 750 Ti a good upgrade from the 7770 or i wont see a good performance increase?