250GB limit is in place with no plans to update BIOS as the CB is considered EOL.I have the 250gb Evo 970 nvme as boot/OS/Scratch, 1TB Evo 960 SSD games/programs, 1TB stock HDD as extra storage.
How much off a difference did changing out the TIM make? Do you have before/after temperatures?I'm curious to see what your temps are.Currently running a 1080TI, as a new 2080 costs over 2x the cost of a used 1080TI.
I've also updated to the latest bios... have you tried disconnecting the power bricks (and unplugging them)?Best of luck to your troubleshooting.On a side note...I wish the mobo would support an m.2 larger than 256gb.