Optane will slow down a U2 SSD if it works at all. They were meant as a buffer for spinners to get them closer to earlier SSDs. The 4k performance is decent but comparing optane speeds to current drives and they are horrendous!
If you can see the drive in drive manager then its the PITA hoop jumping to get it linked with the OS drive and they work only on the same drive the OS is on. I bought one thinking I was going to speed up a pair of spinners I had in raid...uhhhh.....nope!
“Two things are infinite: the universe and human stupidity, I'm not sure about the former” ~ Albert Einstein