RTX on a PCIe 3.0. Thoughts?

[Snoopy]

Hello guys, I have a motherboard with
1 PCIe 4.0 (I have a RTX 3090 there)
1 PCIe 3.0 (Empty)

I need to reduce render time.
I am thinking about adding another RTX 3090 and put it in the PCIe 3.0 empty space. (I wanted a RTX 4090 but they are extremely overpriced right now)

Would the work?
What are your thoughts?


Thank you very much for your opinion!!!

-Snoopy