Which Motherboard to choose?

[late shadow]

I wanted to try to get some opinions again about what to get for a new motherboard.
TLDR:
Is a motherboard with bifurcation and pcie 4.0 x8/x8 enough for 3440/1440p HDR 240Hz (120base X2). Or do I need pcie 5.0 and have to invest 250€ more. 190€ (https://www.asus.com/de/motherboards-components/motherboards/proart/proart-b650-creator/) pcie4 vs 450€(https://www.asus.com/de/motherboards-components/motherboards/proart/proart-x870e-creator-wifi/) pcie5 (yes I searched alot and those are my only options for my needs).

Right now I´m on:
Render RX9070XT + LS FG RX5700XT
AM4 Mainboard 4.0 x 16(CPU) + 4.0 x 4(chipset) with Ryzen 7 5700X
3440x1440p 240Hz
With HDR on I cannot hit 120 base with LS FG because the x4 slot gets saturated (it has to handle my USB slots and second nvme too). I´m capping around 90 FPS as of now.
The RX5700XT is definetly able to achieve my wanted goal according to feedback from here.

I could maybe hit that if I´d invest in a AM4 Mobo with dual x8. But that is a waste of money since my CPU is getting to weak for me too and needs to be replaced.

So I´m already looking for deals for mobos and cpus to go into AM5...later RAM too after the crysis ended. Until then I´m playing with HDR off and deal with my just sufficient CPU.

Question:
Is a pcie 4.0 x8/x8 mobo enough and I can save money with that? Or do I need a pcie 5.0 x8/x8 mobo?

[marble barn]

Well, that's up to you if your budget allows it. More bandwidth will always be better. Keep in mind that it won't matter if your card is RX 5700 XT since it's a 4.0 card

[late shadow]

Since it has slight fan noise on low rpm which annoys me it will be swapped out to a more efficient blower card style too at some point. Fan noise on load doesnt bother me. But on no load I want it silent. For example a Pro W7700 or future Pro 9060 model.

So the question is more about the capability of the pcie bandwidth .

[marble barn]

As I said, until you switch to Pcie 5.0 card, the bandwidth for dual gpu will be locked to 4.0 x8 anyway

[late shadow]

Yes and my question is about the future when the foretold hardware is gonna be used. 🙂

I want to buy the hardware bit by bit on deals now. This includes the mainboard I want to use. I don´t want to swap that out again

Don´t think with what I have now. But what will be there in future. There is no need to take into consideration my hardware from rigth now.
It´s only about the capability of the mobo.

[ember void]

I just snagged one of these refurbished and I love it so far, saw 20% increase in fps immediately (old mobo was a x370 taichi from 2017 lol solid board but dont go with Asrock these days)

[late shadow]

Looks like a decent pick 👍
eATX is to big my smol case tho.

[ember void]

That is true, its not much bigger, my new case just needed very slight modification but yeah you're going to want a larger case regardless to support two gpu's and proper air flow

[late shadow]

Na my case is just fine for two GPUs 😉
#💾│dual-gpu-setups message

Even max OCed to 335W the 9070xt is just fine below 85°C with the intake fans sitting at slight noise level.
While the 5700xt is chilling with 100W at dead silent anyway.