出770换970很正常啊，损失也不大。

即便是4GB显存都不算大，中土莫多的高精度材质要求5-6GB显存，4GB能开到High但不能Ultra，2GB就只能中等质量了：

引用:

Monolith recommends a 6GB GPU for the highest possible quality level - and we found that at both 1080p and 2560x1440 resolutions, the game's art ate up between 5.4 to 5.6GB of onboard GDDR5. Meanwhile, the high setting utilises 2.8GB to 3GB, while medium is designed for the majority of gaming GPUs out there, occupying around 1.8GB of video RAM.

又看到一个对显存有要求的游戏，这次是三上的恶灵：

引用:

"If you're trying to play with a rig with settings below these requirements (you should plan to have 4GB of VRAM regardless), we cannot guarantee optimal performance," Bethesda added.

引用:

原帖由 Nemo_theCaptain 于 2014-10-4 12:24 发表

http://steamcommunity.com/app/26 ... 616189106535339538/

发过了，那是推荐配置，而且是加上共享显存算的
这么算的话连图 ...

Why does the PC recommended ask for 4 GB of VRAM?

The PS4 and Xbox One both have 8 GB of unified RAM which can be used as both system and video memory. Because our PC version is functionally identical to those platforms, we recommend 4 GB of system memory, and 4 GB of VRAM for the best experience.

Can I run it on a card with less than 4 gigs of VRAM?

Yes. Please refer to the minimum requirements above. You won’t be experiencing the game at 1080p and you’ll likely need to turn off some features, but you will still be able to have a great experience with the game.

http://forums.bethsoft.com/topic ... eek-things-to-know/

三上游戏做的好哇，4GB显存还锁30帧外带21:9上下黑边的超宽纵横比，技术力令人惊叹。