Can Proxmox GUI show memory speed?

no, that is not implemented, but you should be able to show it on the cli with:

Code:
dmidecode --type 17

you might need to install the 'dmidecode' package first though
 
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It would be good to show it in GUI?

And are you sure that "dmidecode --type 17" show actual speed? Yes, I'm not ask to actual.
 
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On one of my systems I get:
Code:
~# dmidecode -t memory | grep Speed
        Speed: 3200 MT/s
        Configured Memory Speed: 2933 MT/s
...and I believe that the second line gives the actual speed.
 
do you mean a live memory read/write speeds? if yes, i don't think the kernel exposes such metrics...