That is a question better left for gskill tech support.....It is likely spd or auto timings will set this to 5-5-5-15 like saidin newegg review....you can manually set the timings and see....depending on the chips used on the memory module may require using a certain bios....
memory is an issue on all C2D systems...incompatability is spotting and is usually just slightly off....you could have to run it at 4-4-4-5, 4,5,4,x, etc...too many variables...