i installed gta iv . game is running at 800x600 resolution and cant change resolution . it gives a message that your graphic memory is near to exceed . but its just showing 256mb is used of total graphic ( 4gb total) memory .
Problem is if your GPU has more tha 2GB ram GTA4 will recognize it as LESS THAN 2GB which is bad. Luckily there is a fix, i had the same problem with R9 290 GPU. Just right click on the icon of GTA4 go to properties and in the Shortcut tab paste " -nomemrestrict -norestrictions" without " after the GTA4 exe.
So it will look like this: "D:\Program Files (x86)\Rockstar Games\Grand Theft Auto IV\LaunchGTAIV.exe" -nomemrestrict -norestrictions
How does your pc do running other demanding games?
I have the same problem and I can run Crysis 3 on Max Settings and it runs like it running at medium settings so bascially over 60FPS on max settings and I have two Gigabyte GTX760 Overclocked edition 4GB and they are running on SLI
Problem is if your GPU has more tha 2GB ram GTA4 will recognize it as LESS THAN 2GB which is bad. Luckily there is a fix, i had the same problem with R9 290 GPU. Just right click on the icon of GTA4 go to properties and in the Shortcut tab paste " -nomemrestrict -norestrictions" without " after the GTA4 exe.
So it will look like this: "D:\Program Files (x86)\Rockstar Games\Grand Theft Auto IV\LaunchGTAIV.exe" -nomemrestrict -norestrictions