Great..is it just because of this type of game because I can run Battlefield/Black Ops/Shogun Total war 2/Crysis Warhead on maximum settings without a problem but with this game my card struggles
Ok so I've just used the "auto configure" and the game is extremely laggy and slow.
The game is poorly coded. As a comparison Mafia II looks better and runs perfectly on my GTX 460.
There is mod called Realizm IV which you can download on torrent, its about 4 gig but improves the textures and also boosts the FPS. Use that with the ENBseries and it should look good. However I think you have to install it manually on the latest patch (1.0.7) for it to work.
I don't see the game running at that quality if I can't fix this problem but luckily the 1.0.6.0 patch seems to:
Are you running the Steam version of GTA, or disc based ?
Reason I ask is because Enb Series mods work best with version 1.040 or 1.004 of GTA - patch 4 or 5 iirc.
These versions have dithered / blocky looking shadows & use more video mem, but run around 25% quicker.
The later versions, 1.060 and above iirc, have better looking shadows & use less video memory, but run a bit slower oddly enough.