The GTX 1070 is roughly 40% faster than the GTX 970, which was high-end when GTA IV launched. So why does GTA IV run poorly?

Downloading a clean repack of GTA 4 saves time, but to make it run "better" on a GTX 1070, the magic lies in the configuration files. By using a repack to bypass the outdated DRM (Games for Windows Live) and applying the commandline.txt tweaks to unlock your GPU's VRAM, you can transform the game from a stuttering mess into a smooth, high-definition experience that the console versions could never achieve.

I can provide the exact or mod load orders for your setup! Share public link