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I actually posted about this to Coffee Shelter. I understood that tweaking uGrids can be beneficial for settlement builders, in areas like Spectacle Island.
I did also point out that it can cause instability, so doing a proper test is quite strongly adviced.
But only if.
Only if you want better performance, but it's a bit useless if you already have the specs for it.
uGridsToLoad at 5 is meant for something of the 1050ti and higher and 7 for the 970 and higher.
My 580 has 1 fan and runs at 1266 Mhz
My 480 has 2 fans and runs at 1333 Mhz
Also i have a Ryzen 1800X
7 Is default for higher end rigs, 9 is if you don't feel it's adequte but be warned about it.
Just follow the formula for ugrids to load or you'll be in trouble.
https://www.geforce.com/whats-new/guides/fallout-4-graphics-performance-and-tweaking-guide#fallout-4-ugrids-config-file-tweaks
So yeah, playing at 4K Ultra, makes sense I would only be slightly over a 980 at 2K. Although I may have a step skipped, it may have been 11 where I started noticing performance issues.
In fallout4.ini:
uExterior Cell Buffer=100
uGridsToLoad=9
iPreloadSizeLimit=84934656
In fallout4prefs.ini:
fLODFadeOutMultActors=120.0000
fLODFadeOutMultItems=15.0000
fLODFadeOutMultObjects=120.0000
in fallout4prefs.ini
Gigabyte gtx 970 + i7 4790 + 8gb + ultra settings = almost constant 60fps
Now i get true sniper distance and with weaponsmith extended + realistic bullet its post apo sniper "simulator".
Having it 7 should be safe. I will have to test that myself though.
UgridtoLoad=25 is usefull if you are stress testing Titan Pascal's. I can get the game to run for about 30 minutes before errorless C.T.D. Framerate without mods is always high 80's to 90's. Framterate takes a poop with excessive script heavy mods eating C.P.U. cycles. Framterate de-syncs from the simulation and you get the errorless C.T.D. Usually due to a run away differential equation that is driving the A.I. pathing. Da DeBUGGer is your friend. :-)
Computer:
Intel i9 - 7900x @ 4.8Ghz
64GB R.A.M. @ 2133Mhz
Intel 900p 480GB drive for Steam
Samsung 256GB 950 pro M.2 for Windows
2 x Titan Pascal's in S.L.I. rendering @ 4096 x 2160 @ a variable target of 60 ~ 80 F.P.S. via custom script.
4K