Does Mate 25.04 have support for Intel Arc B580 graphic card and 6K (6144 x 3456) monitors with fraction scaling working?
Sec Q is what is the latest intel driver for Arc B580 graphics card?
Does Mate 25.04 support X870E chipset for AMD.
MATE supports what the kernel supports. All official Intel GPU drivers are in the kernel (except the GMA 500 poulsbo which is the proprietary blob that intel still regrets. )
Default Ubuntu MATE kernel is Linux Kernel 6.14 according to this source:
At 12 December 2024, Michael Larabel wrote on Phoronix:
For those planning to buy an Intel Arc B580 graphics card tomorrow, you will need to be at least on the Linux 6.12 stable kernel for that's the first mainline kernel where Xe2 graphics are enabled out-of-the-box and all the necessary bits are in place. But if you don't mind a bit living on the edge, the Linux 6.13 Git kernel has even more Intel Xe2/Battlemage improvements.
So it seems that with kernel 6.14 and therefore Ubuntu 25.05 and it's flavours (like UbuntuMATE) you will have full support for the Intel B580 out of the box. 
Fractional scaling will NOT work because fractional scaling is not implemented in MATE.
Just set you monitor in a lower resolution (it will upscale automatically using the monitor hardware), qualitywise and technically superior to fractional scaling (which technically does almost exactly the same in software but not as good) and uses much less system resources (RAM+CPU).
Edit: typo
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The literal answer to that question is here:
https://www.intel.com/content/www/us/en/download/747008/intel-arc-graphics-driver-ubuntu.html
But know this: It is what you asked for, but it is not what you want.
If you want to know what seriously the newest official Intel kerneldriver is for the Arc B580, look here:
This is the latest kernel in developement. If you can't find the version number, ask the Intel devs there.
If that boggles you, then know this:
The newest kernel is the newest driver.
What you need to know is that the kernel is regularly updated and that, ofcourse, includes the drivers.
If you want a bleeding edge new ubuntu linux-kernel because of the latest drivers then switch to ubuntu HWE kernels.
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According to:
the “promontory” chipset used in the existing X650(e)/X670(e) is identical to the chipset(s) used in the new X850/X870/X870e boards.
from a hardware perspective, the element of novelty vis-a-vis the previous generation promontory boards is the asmedia USB4 chip - which may already be very well support anyway.
So, the answer is: YES.
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