Question Can I expect better performance upgrading to a 4090 from 2x 2080ti using nvlink

[Cypro]

Pretty much as the title says.
I've currently got two rtx 2080 ti which run using nvlink. Can I expect better performance when I upgrade to a single 4090?
When looking around for benchmarks I can see comparisons between a single 2080ti and a 4090 but I'm not really sure how much the difference still would be as I'm running 2 of them.

I game on 7860x1440 using nvidia surround to link my 3 screens so this leaves me with a bit more pixels than a single 4k screen. CPU is a i9-9900KS so I don't think that would become much of a bottleneck.

Any feedback on if I expect a boost in performance or not is highly appreciated

 

[boju]

Well you have the setup, try same game benchmark site like Techspot uses to test 4090 and compare.

Sli support isn't great so a single more powerful graphics card would have an edge i would have thought.

 

[hotaru.hino]

Yes.

Consider this. The RTX 4090 is around 1.53x faster than the RTX 3080, which is already around 1.275x faster than the RTX 2080 Ti. Combined this puts the RTX 4090 around 1.95 times faster than the RTX 2080 Ti. (I'm using data from Tom's Hardware's reviews, so the numbers are estimates)

While there are times 2x RTX 2080 Tis can achieve around 1.9x the performance over a single card, that seems to be the exception, not the rule. Then there's the issue if the game even supports multi-video card rendering, that VRAM doesn't combine so you really only have 11GB, and if you dabble in ray tracing games, the RTX 4090 has much better hardware suited for it.

So basically, at worst, you're getting the same performance. But that's going to be the uncommon scenario.

 

[Cypro]

Thank you for the advice 🙏

I've also run a local benchmark and shows indeed that I should get a performance boost.
Cinebench 2024 GPU scored 13621

Going to order myself a nice 4090 in the next days