HyperX on a cheap old MB

Hello, I had the chance to grab some set of two 2GB HyperX modules that support 800MHz at timings 4-4-4-12. So far so good. My mobo is an old one(and a budget one) - asus m2n-mx. I discarded the a-data memory I had and plugged in the new set.
Unfortunately I discovered that my new fancy hyperX memory runs at timings 5-5-5-18 which is the same as my old cheap memory. I couldn't find any settings for the memory at BIOS.
Is there anything I can do to make my RAM goes on faster timings or this is the limit that MB.

Thank you!