tCL 8 doesn't seem to go a lot higher than 7. But I'm not gonna say I'm 100% sure, because I'm not. More testing to be done soon.
2070 C7 is 3D Marks & AquaMark 3 stable, and also Spi 8M stable :D
That's with 2.3V exactly.
tCL6 on Striker II Extreme sucks balls.
You've seen my sticks running Pi32M @ DDR3-1800+... yet, on the S2E even DDR3-1768 is unstable... not even a complete Pi 4M run.
Looks like a BIOS or mem ctrlr issue.