How do I set memory timing without having the system not boot up?

How do I set memory timings in the BIOS without having my system not boot up. My memory is Kingston HyperX 2x2GB PC2-6400 800Mhz DDR2 RAM.

This is a follow up to my stuttering problem in games:

I'm pretty sure the problem is that my memory timing isn't set correctly. Currently, CPU-z says my timings are 5-5-5-18, but when I look at the SPD tab, JEDEC #2 says my timings are set at 4-4-4-12. I'm not quite sure what to believe.

Also, when I try to set the timing manually in the BIOS, the system doesn't boot up, and it brings me to the BIOS screen saying there was an overclocking error (obviously an invalid timing setting or something).

I need to know how to set the timing on my Biostar TA790GXB A2+ motherboard and I need to know the difference between JEDEC #1,2, and 3, and which one is the one I should be paying attention to.

[Edit: This is my RAM on]

Memory Screen

SPD Screen
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