How much of a difference in render speed can I expect

comixfana

[How much of a difference in render speed can I expect] going from a 6G video card to an 8G?  I won an Ebay Auction for a PNY Geforce GTX 1070 8GB Video Card a few weeks ago, and just got notice that there was a delivery attempt earlier today.  I should be able to pick it up tomorrow at the Retail Postal Outlet...are we looking at a marginal improvement at best? 

Gordig

It would depend more on which 6GB card you were using than the amount of VRAM itself.

comixfana

Gordig said:

It would depend more on which 6GB card you were using than the amount of VRAM itself.

My current card is the EVGA GeForce GTX 1060 SC GAMING, ACX 2.0 (Single Fan),

 

 

kenshaw011267

What matters for render time, mostly, is CUDA count and what generation of CUDA those CUDA are from.

the 1060 and 1070 are bopth Pascal so the comparison can be direct.

1060 has 1280 and the 1070 has1920. Therefore you should expect, very roughly a 50% increase in render performance.

comixfana

kenshaw011267 said:

What matters for render time, mostly, is CUDA count and what generation of CUDA those CUDA are from.

the 1060 and 1070 are bopth Pascal so the comparison can be direct.

1060 has 1280 and the 1070 has1920. Therefore you should expect, very roughly a 50% increase in render performance.

Sweet!  So the more complex renders with multiple characters, props, architecture (I believe that's how rooms/apartments and the like are referred to?) and a backdrop that currently take me approximately an hour to complete (give or take a few minutes) could now take about 30 minutes? I love it!

 

Havos

comixfana said:

kenshaw011267 said:

What matters for render time, mostly, is CUDA count and what generation of CUDA those CUDA are from.

the 1060 and 1070 are bopth Pascal so the comparison can be direct.

1060 has 1280 and the 1070 has1920. Therefore you should expect, very roughly a 50% increase in render performance.

Sweet!  So the more complex renders with multiple characters, props, architecture (I believe that's how rooms/apartments and the like are referred to?) and a backdrop that currently take me approximately an hour to complete (give or take a few minutes) could now take about 30 minutes? I love it!

I think a 50% improvement was talked about, not cutting render times by 50%. As such a 60 minute render would now take around 40.

 

outrider42

There's a benchmark thread in my sig with some tests on it.

VRAM does not effect speed, in that it is capacity. Think of VRAM as like weight capacity in a mecha video game. With 6GB you can run any scene under that. But if you go over 6GB you cannot render on GPU at all. The scene will instead drop to CPU rendering, which is likely 10-20 tkmes slower. So a 8GB card will allow you to render larger scenes without dropping to CPU. So in a way VRAM totally can effect render speed, but only in a capacity form.

Like was said, the CUDA cores are what effect actual render speed. That and what generation they are. You can typically expect newer generations to have faster CUDA cores. Since the 1060 and 1070 are in the same generation, then it is easy to understand that the 1070 will be fair bit faster.

You also have one other option: use both GPUs. This option requires your PC to be capable of supporting both cards. The motherboard needs to have 2 slots for GPUs, and the power supply needs to be large enough to support them. And the case needs to be big enough, too. If all these things are good to go, then you can use both cards to render and get a much bigger boost than just the 1070 alone. They will combine their CUDA cores together like Voltron. However there is a catch, VRAM does NOT combine. The scene must fit EACH card in order for them all to render. So if you have a scene that is about 7gb, then 1060 will drop put and not render, leaving the 1070 to render alone.

But if the scene is less than 6gb, then both cards will run together, and you will be doing back flips when you see just how fast 2 GPUs can be compared to one for Iray.