[Samsung Galaxy S24 Ultra] extremecarver:
I am pretty certain it ain't Qualcomm X75!!!

Why?

Both Qualcomm and Samsung don't mention it anywhere in their news announcements, specs or website. This was mentioned very often for S23 series!

Contrary to popular belief the modem is NOT part of the SOC. Both radio modem and Wifi/UWB/Blueetooth are separate chips. The X75 modem is produced in 14nm (the next generation X80 will be 6nm and a huge step forward - differences will be even bigger then if Samsung doesn't use it). Samsung does use FastConnect 7800 however and that is often mentioned.

I cannot see it on any teardown, while this was possible I think for s23 series.

Battery life for nearly every Snapdragon 8Gen3 vs 8Gen2 device improved for other manufacturers - for Samsung S24 Ultra vs S23 Ultra it's a bit hit and miss - but clearly some problems when data turned on.

E.g. Samsung S24U wins every battery test against Oppo Find X7 Ultra on wifi - yet it loses most tests that are done on mobile data only.

Qualcomm announced a list of manufacturers that will use the new X80 modem with satellite connectivity - guess what Samsung is not part of it!

There are quite a few things that are unique to X75 which so far aren't implemented or announced for S24 ultra - the main 2:

a) 5.5G or 5G Advanced. I have not heard that Samsung S24 Ultra will support it. Oppo Find X7 series is the first to do so. Other X75 devices should all be compatible yet only China only phones so far announced. Yeah it's only China Mobile so far with the rollout - but it will arrive everywhere in the world sooner or later. 6G is still too far away.

b) Dual Data Dual active isn't implemented. Only Dual active/dual standby. Then however also dual wifi is missing from S23U/S24U even though that's a feature of smartconnect 7800 yet many phones don't implement it.

Last year e.g. Vivo X90Pro+ most certainly cheaped out on the X70 modem and therefore had utterly poor 5G NSA battery drain and pretty bad standby drain (if you have a lot of background sync going on - even though their crazy battery saving stuff that breaks lots of things).

For Samsung this has some upsides - it makes the S24U cheaper,

it makes the Exynos SOC with likely same modem look much better in comparison on battery life and very few people will know that they skipped X75 modem and therefore decreased the difference in battery life (I did have hopes for Samsung, but the fact they didn't manage to produce S24 exynos on 3nm node, while TSMC is pumping out 3nm chips for Apple since mid 2023 doesn't look like they caught up. So far no mainstream device uses Samsung 3nm node and looks like it will stay that way until S25 series - 16 months behind TSMC)

Maybe in north America the S24 series comes with X75? I kinda doubt it too - as Samsung had just some time before announced that they finally have a mmwave modem ready. So I guess all S24 series are mmwave ready - just miss the antenna if not sold in North America. Mmwave was the main reason they could not go Exynos before as I think Qualcomm only sells their modems to Apple without SOC. The modem surely is pricey as Appple tries time over time to switch to their own modem yet never managed so far.

Yes Huawei used to have very good/the best modems - maybe they can still compete now. Next year against X80 likely not as that one will be TSMC 6nm and chinese foundries aren't at that level yet.