anybody got some suggestions to try

Running bios 802
425x8 stap set to 400 ...stable
450x8 strap set to 333 ...stable
400x9 strap set to 400 ...stable

450x8 strap set to 400 it fails everytime, usally in the first 15 mins OCCt or Prime
I used to run this until I flashed to 902, after I flashed back to 802 my settings are still unstable.
I'm thinking it might have to do with transaction booster and clock twister
Twister is set to Strong
Booster is set to Auto
Any ideas would be great