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Builtdown wrote:I´m now concidering to change my 3 X GTX1070 to one RTX4090.

Is it so that there is no profit to have multiple GPUs? So for example one 4090 would be still better option than two 3090's?

Check the benchmark speeds to be sure but on my side one 4090 is 1.9x faster than 3090 so 2*3090 will still be slightly faster than one 4090 BUT it'll use more power (Watt) also so it's a question of efficiency also not just speed.

Just wanted to say that I got to change my 3 x GTX1070's to one RTX4090. It is a beast! Rendering speed went up 450%.

yep, and you have more VRAM, so Win-win if we ignore the outrageous price of 4090 .

By the way,
I noticed that in Octane options if I put RTX acceleration on it doesn´t make that much difference.
In some scene without RTX acceleration the ms.sec is 16 and with acceleration on it´s 17. Shouldn´t it make bigger difference?

Builtdown wrote:By the way,
I noticed that in Octane options if I put RTX acceleration on it doesn´t make that much difference.
In some scene without RTX acceleration the ms.sec is 16 and with acceleration on it´s 17. Shouldn´t it make bigger difference?

It depends on scene, RTX - RT cores are used just for some task not for everything, try scenes with a lot of instances, those should be faster with RTX....
There is somewhere paper/text what RT cores can be used for in octane, so check for octane 2019/2020 releases Otoy info and see what is getting speed-up by RT cores for more detial...

Ok, thanks!