Question ethernet card going at 1Gb intead of 2.5

[LORYT699]

Hi,
Just bought a mobo, z490 edge wifi
The problem as title is that the ethernet card goes at 1Gb connection instead of 2.5Gb.
From windows, the ethernet card setting I ve tryed to set it at full duplex 2.5 but it return at 1Gb, so now it s in defoult mode(negotiable or something like that)
The mobo can go at 2.5Gb because I can see there s write on the drivers realtek 2.5GbE controller, also my connection is at 2.5Gbps and my modem support it.
The question is why it s set to work at 1Gb, is the modem connector? how can I check the speed of a modem connector?
All the other things are fine, everything support 2.5Gb, also the cable(cat5e)
No clue for what can be exept for the modem connector

 

[hotaru.hino]

What model is your modem?

 

[USAFRet]

Performance is dictated by the slowest device in the chain.
PC, modem, router, switch, cable.

Your modem/router likely only has gigabit ports.
Your Cat5e cable is also only gigabit.

 

[LORYT699]

Performance is dictated by the slowest device in the chain.
PC, modem, router, switch, cable.

Your modem/router likely only has gigabit ports.
Your Cat5e cable is also only gigabit.

my modem actually can run at 2.5Gb but I don t know if the ports are 1Gb or 2.5Gb, there is any way to check it?
Btw you are right! the cable can handle "only" 1Gb, I will try with my other cable(cat 8 or 7 idr) and then give update on the thing

 

[LORYT699]

What model is your modem?

I don t know, is from my isp, is the fastweb for 2.5Gb(is almost a square but all blck with leds on the side

 

[LORYT699]

What model is your modem?

the modem is:
fastgate fsg2130fwb

 

[LORYT699]

I ve done some research and the ports are "just" Gigabit, it say that 2.5Gb is the sum of ethernet+wi fi lines, actually a scam.
Btw thanks to everyone