Hi
Sucks when you buy something better and it performs worse eh. Have you checked to see if your motherboard bios is up to date to accept the new cpu? I’d expect a boot error but you never know
i had the problem you are describing but it ended up being ram compatibility problem. My frame rate was high but it felt like it was running at 10fps and my mouse was completely inaccurate.
I experimented in changing the ram speed and was gob smacked the difference it made to stability. My motherboard was setting the ram at 2667 when the actual speed was 3000mhz. XMP would set the value correct but the problem still existed. Change ram and fixed