SLI and CROSSFIRE?

[Symptom]

Could anyone explain to me how one goes about this for fallout 4 and what it would be like to run two gtx 1080s with heavy modding.
Please spare the talk of "oh you don't need all that"

[Park_Ranger]

Yeah you definatly need that.............

http://steamcommunity.com/sharedfiles/filedetails/?id=819595530

[Jonny Sparta]

Ive got sli 970s on still on win 7 tho... but honestly no matter what inspector profiles or window modes i use single card out performs SLI.

And i have gotten great results from this setup with other games. Mad Max is a real standout for SLI utilization, ran that @max max ultra max at like 140fps everywhere.

I'd be very cautious trying to beat fallout 4s optimization with upgrades, there are professional benchmarks out there with 1080's at 1080p dropping to 40fps

[Jonny Sparta]

I could show the same fps counter with 1 gpu. Counter screenshots really arn't a good benchmark for fallout 4 since there is kinda 2 tiers of load your hardware is gonna have to deal with and there's an ocean between them.

[Jonny Sparta]

Well i'll take Dr.Dro on his word, we talked ram earier and he knows some sh1t :)

*reactivates SLI, scrating head*

[Jonny Sparta]

yea on any day that i discover my ram has been underclocked i really shoudn't give any more advice than is nessisary.

Dro's right SLI scales, and heed his words of warning. my amd 8core @ 4.0 is maxing out with my 970s hitting like 30%

[Symptom]

Much appreciated guys lots of interesting info here

[Master Splinter]

Originally posted by Jonny Sparta:

Ive got sli 970s on still on win 7 tho... but honestly no matter what inspector profiles or window modes i use single card out performs SLI.

And i have gotten great results from this setup with other games. Mad Max is a real standout for SLI utilization, ran that @max max ultra max at like 140fps everywhere.

I'd be very cautious trying to beat fallout 4s optimization with upgrades, there are professional benchmarks out there with 1080's at 1080p dropping to 40fps

Getting the exact same problem but with 1070's, both only being used about 50% but when i disable sli, i get better fps and utilisation is at ~95%... what the hell

[Hobo Misanthropus]

Originally posted by Dr. Dro:

SLI scaling is fine, Crossfire I can't say but AMD's hardware is not optimal for this game, it's a Gameworks and DirectX 11 title which means Radeon can't be a worse choice for this game.

At 2560x1080 i've been able to run multiple 4K texture packs, Vivid Weathers and the winter conversion without GPU issues on my SLI 980's, as well as increasing shadow resolution to 6144, FOV to 100, doubling down shadow LODs increasing grass density by around 50% through ini tweaking. The real problem here is the processor - it has literally made my CPU beg for mercy at times.

http://steamcommunity.com/sharedfiles/filedetails/?id=837796444

Alright my hyper threading was off, but 100% on all 4 cores of an i7-4770K OC'd to 4.7 GHz is testament to the fact this game murders CPU's. 0% GPU load because of K-Boost, so ignore that kinda as the readout doesn't work when forcing max GPU clocks.

Wouldn't say it "Murders" CPUs. I mean, if I run Devil Daggers without Vsync, my CPUs hit 100% too, lol, because even a GTX970 can render that game in 8k with room to spare.

I've never hit 100% CPU usage on any core during Fallout 4. The highest recorded was 87% (And FPS was ~45 already with GPU maxing out) though keep in mind, I'm running with Vsync enabled.

Originally posted by Jonny Sparta:

yea on any day that i discover my ram has been underclocked i really shoudn't give any more advice than is nessisary.

Dro's right SLI scales, and heed his words of warning. my amd 8core @ 4.0 is maxing out with my 970s hitting like 30%

It's because SLI is moving the bottleneck to the CPU now. You can basically keep adding visual improvements until that stops, although certain things (especially shadows) are going to hit the CPU too, so keep an eye on your Frame Rate in problematic areas.