im looking under the 1 core ratio limit and there is 4
I'm not understanding what you mean by that.
There should be 4 separate Turbo multipliers that you can adjust, if that's what you're saying.
1 Core Turbo would go to 39x, then 38x for two (or possibly 39x too because I think I've seen that Ivy has the same one and two core Turbo speed), then 37x for 3 and 36x for 4.
So 3.6Ghz will be your max 4 Core OC and the max possible Turbo speed overall is 3.9Ghz.