MadVR - Why no SLI? And what spec is best for new card....

newguy1 · 14th February 2015, 02:31

I've always wondered why MadVR is bad with SLI. I tried reading the super thread, but, c'mon.....it's so long.

ALso, when looking at buying a video card for MadVR, what is the best spec to match up? 3DMark? Texture rate? Other?

Asmodian · 14th February 2015, 21:10

I believe madVR is bad with SLI because of the way the memory on both cards needs to be identical so the data is moved twice. madVR likes memory bandwidth.

I have never seen a correlation between madVR and other benchmarks, faster in 3DMark is faster in madVR but I don't know about small differences. In my experience madVR tends to be most reliant on raw shader performance, memory bandwidth, and driver issues (like AMD being slow doing a DirectCompute -> GPU memory interop so the NNEDI3 performance is lower than expected).

14th February 2015, 02:31	#1 \| Link
newguy1 Registered User Join Date: Jan 2015 Posts: 2	MadVR - Why no SLI? And what spec is best for new card.... I've always wondered why MadVR is bad with SLI. I tried reading the super thread, but, c'mon.....it's so long. ALso, when looking at buying a video card for MadVR, what is the best spec to match up? 3DMark? Texture rate? Other?

14th February 2015, 21:10	#2 \| Link
Asmodian Registered User Join Date: Feb 2002 Location: San Jose, California Posts: 4,407	I believe madVR is bad with SLI because of the way the memory on both cards needs to be identical so the data is moved twice. madVR likes memory bandwidth. I have never seen a correlation between madVR and other benchmarks, faster in 3DMark is faster in madVR but I don't know about small differences. In my experience madVR tends to be most reliant on raw shader performance, memory bandwidth, and driver issues (like AMD being slow doing a DirectCompute -> GPU memory interop so the NNEDI3 performance is lower than expected).