How to config PCSX2 for GT4?

[Rushino]

double res should be near 720p, though.
latest git build : https://buildbot.orphis.net/pcsx2/

Then, any way to fix the broken ghost replay and demos from license tests?

[jesalvein]

No idea apart from updating to latest got build. Ogl renderer may fix them too. But I can't guarantee since I didn't test this game myself (not the NTSC version)

[Rushino]

Latest git build and threaded microVU1 seems to work fine with DX11, I'll google how to fix the other bugs, thank you for your help

[gtgamer468]

For optimal settings with that GPU, avoid upscaling the resolutions and don't use blending unit. It might be blurry, but that's the max you should use. Gran Turismo 4 is a pretty demanding game and requires a really good GPU and CPU.