Grand Theft Auto V is an action-adventure game played from either a first-person or third-person view. Players complete missions—linear scenarios with set objectives—to progress through the story.
Outside of missions, players can freely roam the open world. Composed of the San Andreas open countryside area and the fictional city of Los Santos, the world of Grand Theft Auto V is much larger in area than earlier entries in the series.
The world may be fully explored from the beginning of the game without restrictions, although story progress unlocks more gameplay content. (Wikipedia).
We set all of GTA V's settings to their highest levels for both resolutions but made sure to disable the performance-crippling MSAA settings. We saw the game use almost 4GB of VRAM at 2560×1440 and around 4.5GB at 4K (where possible with the relevant video cards). The built-in benchmark is used to gather performance data.
Performance data from the AMD R9 295X2 unfortunately could not make it into the charts as the card has a bug with our test monitor that prevents GTA V's benchmark from operating.
Nvidia hardware fares well in Grand Theft Auto V, so it is no surprise that the GTX 980 STRIX comfortably outperforms Asus' R9 390X STRIX at 1440P.
GTA V is one of those titles that can make use of frame buffers larger than 4GB. The performance gap between Asus' GTX 980 STRIX and R9 390X STRIX DC3 OC is significantly closed at 4K. With that said, it takes GTX 980 Ti-level performance to even start to make GTA V look playable at the demanding 4K resolution with maximum image quality settings.
The 8GB of VRAM on Asus' R9 390X DC3 OC is likely to show its greatest benefits when a pair of cards is run in CrossFire. This will provide enough GPU horsepower to make the large – 8GB – frame buffer capacity worthwhile.