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Two GTX 970 or one 980 Ti for GPU rendering and VR?
show user profile  Nanne
Hello mates,
What would you recommend for rendering on GPU and doing some VR; two GTX 970 or one GTX980 Ti card? I can get these setups for roughly the same price.

Cuda cores
970: 2x1664 = 3328
980Ti: 2816

VRAM
970: 4GB
980Ti: 6GB

Memory Bandwidth
970: 224 GB/sec
980Ti: 336.5 GB/sec

Texture Fill Rate
970: 109 GigaTexels/sec
980Ti: 176 GigaTexels/sec

My motherboard has 3x PCI Express 2.0 x16 slots with support for 3-way SLI. I also have my old GTX 590, that I was thinking of keeping for Windows to work with.

Cheers!

Kristoffer Helander
www.kristofferhelander.se
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read 418 times
3/24/2016 2:29:20 PM (last edit: 3/24/2016 2:49:54 PM)
show user profile  gogodr
if you can afford it, then the 980ti.

when doing SLI the video memory doesn't add so even with 2 x 4GB video cards you will still have only GB of video memory effectively.

Hello there

beautiful ;3


read 415 times
3/24/2016 2:45:44 PM (last edit: 3/24/2016 2:45:44 PM)
show user profile  Nanne
Yep, I know about the memory thing. But what about the total number of CUDA cores compared to the lower amount of VRAM and lower memory bandwidth?

Kristoffer Helander
www.kristofferhelander.se
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read 412 times
3/24/2016 2:49:36 PM (last edit: 3/24/2016 2:49:36 PM)
show user profile  Nik Clark
The 970 is a good card, but I'd go for a single 980 with 6 GB if I was making the choice.


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read 409 times
3/24/2016 2:52:06 PM (last edit: 3/24/2016 2:52:06 PM)
show user profile  ijzerman
Have you considered the AMD Fury X2/DUO?
Its a single card with 2 chips on it and its in the same region as a 980.
http://wccftech.com/amd-r9-fury-x2-launching-in-december/

--------------------------------------

Pushing buttons since "86
read 398 times
3/24/2016 3:27:45 PM (last edit: 3/24/2016 3:27:45 PM)
show user profile  Nik Clark
Sadly, not a CUDA device.


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read 398 times
3/24/2016 3:29:51 PM (last edit: 3/24/2016 3:29:51 PM)
show user profile  Nanne
iray and PhysX doesn't run on AMD cards since they need CUDA.

Kristoffer Helander
www.kristofferhelander.se
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read 398 times
3/24/2016 3:40:01 PM (last edit: 3/24/2016 3:40:01 PM)
show user profile  Nanne
Here is some interesting input from Phillip Miller from Nvidia over at the ARC Forums

For Iray rendering speed, you need to look at CUDA core count and core clock speed, as Iray will scale pretty evenly across both. Also note that the "value" of a CUDA core will vary between GPU generations, so a linear comparison can only be made within the same generation.

In your example, the GTX 970 has 1664 cores with a 1050 MHz clock while the GTX 980 Ti has 2816 cores and a 1000 MHz clock. The 980 is a "full size" GM200 GPU while the 970 is a "medium size" GM204 GPU. In a 1:1 comparison, the 980 should be about 60% faster than the 970 (2816/1164cores * 1000/1050clock). A second GPU doesn't exactly double performance, but the dual 970 should be about 10-15% faster than the single 980 TI.

Hope that helps.

- Phil


https://forum.nvidia-arc.com/showthread.php?14467-Two-GTX-970-or-one-980-Ti-for-iray

Kristoffer Helander
www.kristofferhelander.se
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read 374 times
3/24/2016 11:12:52 PM (last edit: 3/24/2016 11:12:52 PM)
show user profile  gogodr
for VR on the other hand, the more video memory, the better.

Hello there

beautiful ;3


read 371 times
3/24/2016 11:19:35 PM (last edit: 3/24/2016 11:19:35 PM)
show user profile  Nanne
Good point, but 4GB is pretty good though...

Kristoffer Helander
www.kristofferhelander.se
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read 353 times
3/25/2016 11:52:22 AM (last edit: 3/25/2016 11:52:22 AM)
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