a8v ratios..?

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hi, i have some pretty bad for ocing ram, and can only handle max 205mhz, and i want my cpu at 2.6ghz.. soo, i tried fiddling with dividers, and i can only get it to boot at 242 fsb with a 5:3 divider.. this is confusing me because i thought a 2:1 would be better than 5:3, but it wont boot with it..

so is 242 the total max i can get, then?