Originally Posted by kesawi
4GB of VRAM is overkill as at 1080P the usage shouldn't get near 2GB. 4GB starts to become beneficial at higher resolutions such as 1440P or for multi-monitor setups which is not what the OP is doing. Also a GTX770 would be beneficial if the OP was running higher than 1080P or a 120HZ monitor, but at 1080P with the 60Hz refresh rate on the TV the GPU would not be used to its full capacity. A lowered performance card such as a GTX650Ti would be more appropriate for the budget and could handle the majority of games more than adequately.
2GB VRAM is not enough. The PS4 has access to ~5GB GDDR5 for games. This won't all be used as VRAM, but it's certainly possible that more than 2GB
will be - and console games run at lower resolutions, framerates, and image quality than PC games do, so the PC will require more VRAM than the console.
If you want to use a lot of anti-aliasing, supersampling, or downsampling, more VRAM always helps.
People are going well above 2GB VRAM using with Skyrim mods alone, and that's a last-generation title.
One of the first things that has always caused me to consider upgrading to a new graphics card, has been a lack of VRAM.
4GB is not an expensive upgrade over 2GB on the GTX 770, and well worth it, in my opinion.
As for performance, I suppose it depends what you consider to be acceptable. A GTX 650 is nowhere near suitable for gaming purposes if you intend on matching or exceeding the capabilities of the consoles.
Just look at how much Assasin's Creed IV is pushing systems, and that's one of the first ports of a next-gen game. An overclocked 780 Ti is just barely
managing to stay above 60fps.