So I am contemplating my memory upgrade. Right now I only have 1x1 gb Corsair xms2 ddr2-800 and despite being advertised at 5-5-5-12 it only runs at 5-5-5-18. There is no option to set memory timings in my bios, only cas# (Gigabyte GA-M55SLI-S4 MoBo). I am wondering if I should go with 2x1 Gb of another brand (i.e. mushkin with advertised timings of 4-4-3-10, I think) or just save the money and buy only 1 more Corsair despite the wrong timings. Would I really notice a difference between 5-5-5-18 and the advertised 5-5-5-12?