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Yon

Two 1070 or One 1080ti?

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As they are about the same price. 

People on nvidia discord are convinced sli is dead, and causes stuttering. Tho they were talking about gaming and not rendering. Does stuttering apply to rendering?

Looking to invest in some cards this season, what is your opinion on the best decision to make, given 1KCAD and a mobo with 3-way Sli

Since 1070 has 8gb, and 1080ti 11, If I went with 2 1070 I would be +5gb..can som1 vouch for sli? Cuz it's the only reason I wouldn't go with the 1070 at this point.

Looking to render large scenes, so I know 8gb of VRAM would be needed at least. Anything else you can share on the topic would help. Haven't studied gpu before.

 

thanks

Edited by Yon

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don't think you can just add up 2x8=16 and say that's > 11 by 5...i thought that whatever is the biggest of the lot that counts...so the 2x8 is really 8....not 16...I could be wrong tho...

This could be relevant to your decision:

https://www.redshift3d.com/support/faq

When Redshift uses multiple GPUs, is their memory combined?

Unfortunately, no. Say you have an 8GB GPU and a 12GB GPU installed on your computer. The total available memory will not be 20GB, i.e. the 8GB GPU will not be able to use the 12GB GPU's memory. This is a limitation of current GPU technology and not related to Redshift in particular. We, therefore, recommend users combine videocards that are fairly "equal" in terms of memory capacity.

Having said that, Redshift supports "out of core" rendering which helps with the memory usage of videocards that don't have enough VRAM (see below). This means that, in contrast with other GPU renderers, the largest possible scene you'll be able to render in the above scenario won't be limited by the system's weakest GPU.

Edited by Noobini

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Ic, thanks. I talked to others that confirmed gpu memory doesnt sum. But they said it will go with the highest card. I'm gonna ask on RS forum to confirm what it is.

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also take into account the viewport with all the bells and whistles turned on can take an enormous amount of vRam. i.e. UHD full-screen eats 5+GB IIRC 

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yea some one else said the same thing, so he uses a 1080 for look dev on his workstation and 1070's for his slave

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Always go for 1 higher-end card over 2 mid-level cards. The compatibility issues and restrictions of SLI, not to mention the VRAM issue, only make 2 cards an option if you're pairing 2 top-end graphics cards together.

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