Does the UE4 engine support SLI?
Does the UE4 engine and development tools support SLI? I am building a PC and i just need to know if its worth getting two GTX 760s
asked Mar 30 '14 at 07:18 PM in Using UE4
Out of the box, if you wish to use all the features of UE4, you should forgo SLI.
The most common form of SLI is know as AFR (Alternate Frame Rendering) where each GPU handles a different frame. [ This is what we did with Samaritan on UE3 - 3 GPU's each handling a different frame ].
The deferred rendering techniques used by UE4 rely on data from the previous frame to render the current frame and as a result are not SLI friendly. You could investigate which features are needed for SLI and potentially avoid them, however since that is not a usecase we have here at Epic, i'm not sure how well it will work as we keep extending UE4 with new functionality.
answered Mar 30 '14 at 07:33 PM
Hi, as per above and https://forums.unrealengine.com/showthread.php?29105-Crossfire-support- it appears there are no plans for UE4 SLI support.
However for VR, apparently Nvidia GameWorks VR SLI is to be integrated into UE4 as per Nvidia announcement here: http://blogs.nvidia.com/blog/2015/11/09/gameworks-vr-unreal-engine-4-ue4/
Here's some slides on GameWorks VR in general: https://developer.nvidia.com/sites/default/files/akamai/gameworks/vr/GameWorks_VR_2015_Final_handouts.pdf
So that should enable VR SLI in UE4 when it comes out.
Of course, if someone from Epic can comment, that would be great.
Yeah Epic Games, please comment!
I am trying to work on gtx 970 sli, performance in editor is much better but after clicking "vr preview", whole pc is going down... Is there anything I can do?
answered Apr 04 '16 at 11:56 PM
the_palion your computer was crashing probably because of quarrel between Oculus Drivers and UE, not because lack of support for SLI. Instal new Oculus SDK for Windows V1.3.0 and UE 4.11.1 and your computer will stop going down in VR Preview.
BTW anybody know is there any solution to turn on 2x GTX 900 series in SLI mode in UE??? I don't believe this is impossible. I'm only graphic designer. I don't know how to coding at all but if this is only way i'm ready to try.
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