we have recently created an unreal 4 tech demo in order
to test the performance with our SLI GTX 980 System.
Unfortunately the second GTX has absolutely no effect.
Neither with the DK2 nor with a standard view through a monitor display.
Is there something what we are missing?
I have read a lot in different threads that you can achieve a performance boost
through a SLI system , although there might be problem with the second
GTX card in regards of the OR
However, it has absolutely no effect.
When we try out other unreal tech demo which are available
on the internet and forums we can clearly see the effect ( I’m only talking about non
DK2 Demos - as an example the Apollo Tech demo)
Also I think when starting a unreal 4 tech demo / application there should be
a visible SLI Logo if activated through the Nvidia system option.
Have you gone thru most of the standard OR optimization tricks already before comparing the SLI performance vs a single gfx card?
For example, disabling Frame Rate Smoothing (Project Settings → Engine → General Settings → Smooth Frame Rate = false). Or disabling TemporalAA (Global Post Process Settings → Misc → AA Method = FXAA or None). Or turning down the scalability settings from “Epic” to something lower. Or by killing any Aero effects on your Windows. Etc etc. There’s a long checklist of things that will cap out the performance on a DK2, where maybe that 2nd card won’t make much difference until your project is optimized properly.
Maybe you misunderstood my post or I was not clear enough.
It’s not the case that the performance is very good right now.
we have to decrease many many settings in order to achieve the 75 fps
border for a decent OR experience. If that would be the case ( perfect performance ) than I would agree to your comment. please correct me if I’m wrong here.
there is absolutely no difference in our fps when activating or deactivating the
SLI system via nvidia settings - not one fps.
exactly the same without the OR but of course with much better performance.
However if used on a 4 K screen we achieve right now approx. 25-30 fps ( without OR)
even in that case the second GTX should give us more performance when activated. but there is no difference.
I was wondering if you have to implement or activate the SLI feature inside
the Editor?
is there any console command to check the graphic performance or SLI power just to be 100% sure that the second card is activated and in charge?