Those are PassMark benchmark scores. PassMark is a benchmarking software which runs the CPU through many stress tests like read/write operations, math calculations, and graphics processing. People who run PassMark can submit the score they got with their processor so those charts are showing the average submitted scores for each processor. I wouldn't read into the overclocked processor charts much because they include mild overclocks as well as extreme overclocks, and there's no way to know how overclocked the processor was when it got the given score. If you really want to see specific scores, you can click a processor from the list and it will show the last 5 submitted scores along with information like RAM, measured speed, hard drive, graphics card, etc.
As far as your mobile processor, you are right, many of the mobile processors will rival the lower high end desktop processors so you don't need to worry about lack of mobile power. The amount of RAM varies with the user who submitted the score, but it's mostly irrelevant since the test only stresses the processor. I have a desktop i5-3570k and a i7-2720QM laptop, and the laptop processor is pretty much just as powerful.