CAS settings missing from LANPARTY UT SLI-DR Bios

[Guest slugbug]

According to the guides posted here, I should have these CAS options in my bios: Auto, 1, 1.5, 2, 2.5 3, 3.5, 4, 4.5.

I have the latest bios (NF4LD406) and only have Auto, 2, 3, 3.5, 4, 4.5.

My Corsair TwinX-3200-C2 will do Cas 2.5 with an A64, but I don't have that option available in my bios. I tried a few different bios and nothing changes.

Any ideas?