Just to put this out here...………………..
Since the advent of AHIII's use of post processing of AA and lighting effects (essentially most\all graphics frame RENDERING, not talking graphics frame DRAWING here), you can actually use the vid card driver's AA & TF settings in conjunction w\ the ingame's graphics post processing techniques to enhance the graphical quality of the ingame graphics settings above the ingame setting levels.
This is especially true for all users of any of the higher level Nvidia AND AMD graphics cards put out in the last 2-3 yrs. Reasoning is very simple due to the game's use of post processing (this AA\rendering work is applied to a graphics frame by the graphics card's SHADER CORES (CUDA CORES for Nvidia) AFTER the GPU has finished the drawing of said frame) so the GPU CAN apply a lower or same or higher AA\rendering level work at the front end of a graphics frame before it is passed to the shaders\cuda cores so they can both coexist w\o any error. This is by DESIGN in the drivers as it is well known by both AMD & Nvidia and the capability has existed within the drivers to apply both techniques at both ends for quite some time as both AMD & Nvidia drivers have been written to use both techniques in tandem for years......the hardware in times past wasn't powerful enough to adequately make use of this ………..until nowadays.
In the NVCP and Radeon Settings there should be a setting in the AA section labeled like this "Enhance Application Settings" (exact AMD Radeon Settings label but is something similar in NVCP) which instructs the GPU to "enhance" the ingame graphics AA settings w\ the type\level of AA settings chosen in the driver as long as you
DON'T USE Nvidia's driver supplied FXAA (this is Nvidia's post GPU processing AA technique and is what AHIII is using to post process AA ingame) or AMD's driver supplied Morphological Filtering (AMD's post GPU processing AA technique) w\ the game's AA setting selected as by using these you're essentially "duplicating" the ingame AA setting in the driver (if the ingame post process AA is selected). All the other driver AA settings are applied by the GPU at the front end and are fair game to use.
As for the texture filtering (TF) settings within the driver they are being used by the game anyway (AMD for sure as there is no option to allow for application control of TF in Radeon Settings, not sure about NVCP in this regard as it's been a while since I've used a Nvidia product...working off memory) so you can set these to your heart's content as these driver settings set the level of texture filtering to apply ingame (in AMD the Performance setting is strictly the old bilinear filtering-least load on GPU, Standard is bilinear filtering w\ trilinear filtering used in certain situations to make the finished graphics frame "appear" as fully trilinear filtered w\o the GPU load of full trilinear filtering-read as mid GPU load, High is full trilinear filtering applied to full frame-high GPU load) then the rest of the graphics objects\terrain rendering levels are set ingame as they always have been (the sliders that you been using along w\ any hard-coded ingame rendering settings) as AHIII does some of this on the GPU but I assume the game does most of this during post processing on the shader\cuda cores.
The use of these settings in this manner will allow much higher final graphical image fidelity to be achieved by strategically using both the GPU AND shader\cuda cores in tandem as opposed to using just 1 or the other by using enough of the traditional GPU applied AA\TF to enhance the post processed results of the shader cores and keep the GPU load at a manageable level to maintain the desired FPS levels while playing.
These settings do indeed work in Radeon Settings (tested and proven by myself) w\ AHIII on all the Crimson & Adrenalin driver sets on the AMD Radeon vid cards that I have used w\ AHIII (Radeon R9 290X, Radeon Fury X & Radeon RX Vega 64) and do make a very noticeable difference in graphics image fidelity (for the better IMHO) while exacting a very manageable GPU load to maintain FPS in AHIII (tested up to and including 4K using AMD's VSR settings).
I can't see any Nvidia card in the same class or higher as the AMD cards I've listed not be able to do this as well or better as I believe the settings exist in the NVCP to do so and have been there about as long (or longer) too.
I've provided some snipped\recorded examples of these settings being used....note the dates typed in the titles. I started working w\ this while using my Fury X card then used the 2nd 1 on both my Fury X and R9 290X vid card (pulled the Fury X and used the R9 290X vid card while waiting on the RX Vega 64 card to arrive....the only difference was the Power Efficiency setting wasn't available for the 290X but I didn't snip that for proof as I didn't care at the time....was testing these new settings w\ the older card for giggles....she ran them just fine in AHIII but was loaded pretty full though doing it) w\ the final 1 being currently used on my WC'd RX Vega 64 vid card in sig below w\ the latest drivers at the time. This is an indicator of how long this capability has existed, just it seems that no one even knows about this or reviews it.......this capability was present in AMD drivers (even the old CCC) even before I discovered it.
Putting this out here for information purposes. Gonna check my files to see if I actually recorded a video of my R9 290X using the settings I gave and if so I'll post it.