Part of that is almost certainly thanks to the gobs of memory bandwidth the Fury X has (512GB/s vs. Nvidia has their usual lead with the 980 Ti at 1080p, but that turns into a tie at 1440p, and at 4K the Fury X takes a clear lead. And no, Doom didn't crash during our testing, even on 4GB GPUs with Nightmare quality enabled, though we didn't play for more than 15 minutes.
We also ran the Low preset and Ultra + Nightmare (and 16xAF), both at 3840x2160. We used our standard test bed, which runs an overclocked 4.2GHz i7-5930K with 16GB G.Skill DDR4-2666 RAM. (Note: we've updated the graphs and drivers for AMD since originally posting this article.) The Nvidia GPUs were tested using the latest 365.19 drivers, and the AMD GPUs used the Crimson 16.5.2.1 Hotfix drivers-both driver sets are supposed to be optimized for Doom. We haven't completed extensive testing (yet), but here's a quick look at a few different graphics cards, specifically Nvidia's (reference) GTX 980 Ti and GTX 980, and AMD's R9 390 (Sapphire) and R9 Fury X (reference). Given the relatively slight changes in appearance, the other question you're no doubt asking is how Doom runs.
There are also a few notebook GPUs with 6GB or more VRAM. On the AMD side, the only consumer GPUs that currently have enough VRAM are the R9 390X (8GB), R9 390 (8GB), and the R9 290X 8GB (which wasn't a common card, though a few exist). And naturally, the upcoming GTX 1080 and GTX 1070 (both 8GB cards) will also work. The more recent GTX Titan X (12GB) and the similar performing GTX 980 Ti (6GB) also qualify. There's the original GTX Titan, with 6GB, plus the derivative Titan Black and Titan Z (both with 6GB per GPU).
The list of graphics cards with more than 5GB of VRAM is pretty exclusive.
But we threw caution to the wind and retested performance. You can get around it by starting the game with "+menu_advanced_AllowAllSettings 1", but if they're serious about crashes, you're probably best off leaving it alone. If you're running on any GPU with less than 5GB VRAM, you're going to see the above warning. 5GB is an odd amount of VRAM to require, but presumably that's to ensure the game engine has enough space for all the textures, frame buffers, Z buffer, and whatever else it needs.
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