let's be honest here. have you ever use GTX970 yourself? as i said both tech journalist and youtuber have investigate this and they never find performance regression. find me one article or video that show GTX970 have it's performance tank once VRAM usage exceed 3.5GB. else you're just making things up.It had 3.5GB then 0.5GB that was essentially useless as it tanked performance as soon as you try to use it.
this GTX970 is one thing that i inherit from my older build. back then my DDR3 speed only tops at 1600Mhz. i don't see any performance drop either back then.And of course you won’t notice a difference vs the slow VRAM once you get to 2666Mhz DDR4 you’re at 21GB/s In single channel over 30 in dual at the base 2133Mhz and around 40 for 2666.
this topic can be a very long one. but probably you will understand once game start using DX12U performance enhancing features in future games. but the key word you need to remember is this: "performance enhancing features". i will stop here. no need to derail this thread further than it already is.Kepler dropped off because it’s old, Maxwell is starting to get it now and in a couple of years Pascal will too. Hell even look at the RX and Vega cards that have leapfrogged the 1060 and 1070. Hell the Vega 64 is trading blows with the GTX 1080 now