No, there's really no relation between the two numbers. A computer with a 2 GHz processor for example, could have 512mb ram, or 4 gb ram. There's no telling one by the other. However, did the ad say what
type of processor? Is it AMD or Intel? Dual Core or Single Core? If it says specifically what kind, then you might be able to get a feel of the processor speed. If it tells you specifically what model processor it is (i.e. AMD 6000+), then simple research can tell you the speed.