Everest reads the G.Skill F2-8500 ram I have and shows that it needs tWR 13 and tRC 48.

The F5 bios only allows max tWR of 8T and max tRC of 42T.

(And the BIOS appears to default to 127nm on the rRFC... not 195ns.)

I'm not sure if these timings would make the NB unstable... but the differences can't be helpful.

(But since I can't change the BIOS to those values... I can't test the timings that are part of the RAM's EPP profile.)