I will test it next week at the office. Maybe I will prepare the Ubuntu live USB and some other distro.
Also next week I will get my hands on Dell 5070 Micro i5-9500T. Colleague has one and will borrow it for couple of days so I can perform tests with my own SSD.
I will update this thread once I see the results on my own eyes ;-)
Just as an update
I played with three DELL systems for the whole past week:
Dell 5070 Micro / i5-9500T / 16GB RAM DDR4
Dell 3050 Micro / i5-7400T / 16GB RAM DDR4
Dell 7040 Micro / i5-6500T / 16GB RAM DDR4
Monitor: AOC U3277FWQ (4K 60Hz).
The same cable for all systems.
The same WD Red 256GB SSD with Win10 Pro installed.
The difference between i5-9500T and i5-6500T is just unbelievable!
During a normal office work the i5-6500T acts like some frames were skipped, the CPU was constantly using around 50-70%. GPU used around 20% all the time, but when I was moving windows around the desktop, it went up to around 90%.
When I opened around 10 MS Edge windows and one Citrix desktop, I was not able to work comfortably.
Then I tested i5-7400T. The experience was not bad. I was able to work with no lags, but when I started moving windows around it looked like I was playing game in 20fps
The i5-9500T just crashed all other CPUs :O I thought I was working on a standard size desktop machine. At the end I even tried to connect 11 mailboxes in Outlook, two Citrix desktops and around 50 MS Edge windows. The experience was really smooth and I did not experience the "lower fps" feeling.