More Vram is better for the best textures/settings and higher resolutions.....I mean who saw this coming...
..Such a mysterious thing that...
I did a very quick research and the maximum RE7 reached at 4k with ultra was 8GB vram
Source:
https://www.overclock3d.net/reviews/software/resident_evil_7_biohazard_pc_performance_review/9
As for RE2, it is still a demo as far as i know so maybe the game is just not well optimized and drivers and patchs can fix this
A gpu cannot use more VRAM than what it has, so developers have many ways to go around that, you saw what happened in Mirrors Edge Catalyst......Another thing that can happen is that System RAM is increased along with CPU usage with cards where there is a VRAM constraint.....
FWIW, RE7 has a high ceiling and you can use if you have it........If you look at a game like FF (though unoptimized and filled with NV performance de-enhancing drugs), you can only really get stutter free gaming at 4k with a card with lots of Vram, like the Titan for e.g.....
Just look at the link below and see what statement they have bolded in their conclusion, and that's at 1080p.....Yet remember, a card cannot use more memory than it has....Doesn't mean it won't run the game, but a card with more Vram will run it smoother, can do better settings with more aplomb, higher resolutions with less stutter, perf etc....
https://www.tomshardware.com/reviews/resident-evil-biohazard-re7-test,4907-4.html
Also, I don't understand the comments on RE2 from other users, the game uses 8GB of Vram on textures alone at 1080p, how can we conclude it will not need more or cannot use more. If you have an 8GB card you will have to run RE2 at lower than 8GB textures to avoid suttering, especially at higher resolutions.......Plus, RE2 has taken things to a whole new level over RE7 as far as textures, lighting and volumetrics..You will need lots of Vram and high bandwidth to run this at top spec at 4k........Which again brings us to the point of consoles; that is why VGtech is correct in saying that the consoles are using reconstruction for both RE2 and RE7, surely to save some cycles from that (would be) rez imprint........(Barring console settings vs best PC setting differences as well)....... So uhhh!.. I'm looking forward to hearing Dictator's breakdown on PC vs Console in RE2, seems they dialed it up a bit more, yes, we've had our differences, but I think he will do a very good job there. So looking forward to that.....
As for Vram in total.....
"The memory side has seen a major uplift with the card featuring 16 GB of HBM2 VRAM across a 4096-bit wide bus interface. There are four stacks, each of which operates at 256 GB/s, delivering a total of 1 TB/s bandwidth.
AMD states that the excess memory is useful for content creation and upcoming titles in 2019 can use up to 11 GB of onboard graphics memory."
https://wccftech.com/amd-radeon-vega-vii-gaming-performance-benchmarks-specs-official/
Another exec said that games like the Division, DMC, RE2 will use the vram, especially at 4k as can be seen already....And of course many other games in 2019. Metro and many other titles are looking like good candidates....