I am very happy for you!
Replacing the CPU should take even less of your time.
And now about the positive effect after the CPU upgrade from 6400T to 7700T.
1. The problem of the non-uniform speed of CW and uneven PTT delays in the N1MM program has been completely solved.
This is the most important thing for me.
"Drunk sailor" - so we call this unpleasant effect in Russian. And this effect is no more.
2.I connected two monitors to MB1: The first Samsung monitor is 4K 27 inches - directly to the video port MB1 and the second monitor is also Samsung, but with HD resolution through the USB-HDMI adapter.
It all works together with the N1MM program and the SDC with skimmers, plus the OM POWER OM-2000A + power amplifier control software and uses only 15-20% of the CPU load.I checked it during ARRL CW Contest 2019 and did not experience any problems. It was very comfortable.