Thing is, the quantifying fact is that nobody really has massive issues, dozens and dozens of media have tested the card with in-depth reviews like the ones here on my site. Replicating the stutters and stuff you see in some of the video's, well to date I have not been able to reproduce them unless you do crazy stuff, and I've been on this all weekend.
After some internal testing here over the weekend we could quite honestly not really reproduce stutters or weird issues other than the normal stuff once you run out of graphics memory. ..
So I have been asked to look into this by many of you. And we did so, all are reviews on the GTX 970 stand as they are. They show the real performance of gaming with this card. The past few days we did look a little closer to some of the reports out there. At 2560x1440 I tried filling that graphics memory, but most games simply do not use more than 1.5 to 3 GB at that resolution combined with the very best image quality settings. This includes MSAA levels of up-to 8x. At the best settings and WHQD we tried, Alien Isolation, Alan Wake, BioShock Infinite, Hitman, Absolution, Metro Last Light, Thief, Tomb Raider, Asassin’s Creed Black Flag.....
Let me clearly state this, the GTX 970 is not an Ultra HD card, it has never been marketed as such and we never recommended even a GTX 980 for Ultra HD gaming either. So if you start looking at that resolution and zoom in, then of course you are bound to run into performance issues, but so does the GTX 980. These cards are still too weak for such a resolution [4k] combined with proper image quality settings.
We tested specifically with this title [SoM] as reportedly it runs into problems (stutters) at the point where it can't use more VRAM, with our card that is 3.6 GB. Read that carefully, we can not load up the card with more VRAM even with heavier DSR - and that is the precisely point where people have been complaining about stuttering and other issues.
Overall you will have a hard time pushing any card over 3.5 GB of graphics memory usage with any game unless you do some freaky stuff. The ones that do pass 3.5 GB mostly are poor console ports or situations where you game in Ultra HD [4k] or DSR Ultra HD rendering. In that situation I cannot guarantee that your overall experience will be trouble free, however we have a hard time detecting and replicating the stuttering issues some people have mentioned.