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I cannot set the Minimum RAS Active Time (tRAS) higher than 30, and I cannot set Row Cycle Time (tRC) above 42.
I'm using a gigabyte GA-990XA-UD3. In the manual it says tRAS 8T~40T, tRC 10T~56T. I'm using the latest non beta bios version F13.

I have tried two sets of RAM, the samsung low voltage and this kit: http://www.newegg.com/Product/Product.aspx?Item=N82E16820313323
Both kits do not allow me to set those timings higher. The Team kit requires those timings to be higher, although I doubt my phenom II can do 2400Mhz. It's doing 2133MHz so far.