2 GTX 1060 3GB vs 1 GTX 1060 GB for 3D rendering

[maxrena]

Due to the lack of GPU these days, I got 2 options from my friends. 1 is get 1 GTX 1060 3GB from him, or I wait to get enough money for 1 1060 6Gb.
But my question is, I dont know if 2 x 1060 3GB can render twice as fast 1060 6GB or the VRAM will affect the render time.
I use Blender for 3D modeling.
Thank for reading.

 

[k1114]

Vram doesn't affect render time unless the scene can't fit then it will just give errors and not render. You should know how much vram you are using to know if it'll be an issue. If it is less than 3gb, it won't be twice as fast because the 1060 3gb has more stuff disabled than a 6gb version but it'll be close. Scaling is near linear.

 

[maxrena]

If it is less than 3gb, it won't be twice as fast because the 1060 3gb has more stuff disabled than a 6gb version but it'll be close. Scaling is near linear.

I don't really get that. Just let me sum up again to clarify what I understand.
Technically, 2 x 1060 3GB will almost double the render speed of 1 x 1060 6GB.
Vram just to ensure that I can render things or not.
Is that correct?

 

[k1114]

2 x 1060 3GB will almost double the render speed of 1 x 1060 6GB for gpu rendering in blender.
You need enough vram to ensure that you can render things.