You should have compared CPUs of the same architecture and if possible core count.
The A8-3870K is Llano based which has higher per-core performance than the Piledriver-based FX-8350. The FX has four more cores, but they really aren't used in a 3Dmark type benchmark because the CPU threads for game graphics handling are one or two threads at most.
Your test doesn't show what you want it to show because the results are not comparable.







