Considering the max. stock freq. is 3.8GHz, you have a very nice, moderate over clock at 4.6GHz. Your memory is designed for 1600MHz so that's just fine. Overclocking the memory will give you no additional perceivable performance.
However, since your Vcore is so low at 1.25v, I suspect that you haven't yet run Prime95 to insure your over clock is stable. The BSOD after running 3dMark11 is another indicator.
Run Prime95 for 30 to 45 minutes, to insure that all workers are running, none turn red, your loads remain 100% on all cores, and your temps remain within Intel thermal specs. Monitor your temps, and if you see them climbing more that a few degrees above the design limits, shut it down, by simply exiting Prime95.
You'll have to research, (Google), your particular chip, but most state of the art Intel processors today have a temp limit of around 68c, and a Vcore limit around 1.35v....again, I'm just giving you averages, you'll need to look up the specific specs on your 3570k.
Good Luck!
EDIT: If you blue screen, you have 2 options, either go back into the BIOS, and bump your Vcore up about twice, and run Prime 95 again, and again watch those temps! If you find that you have to keep bumping up the Vcore, and the voltage, or temps, are getting too high, just lower your over clock. You may find a sweet spot for a 24/7 over clock that is perhaps 4.3GHz, with good temps, and moderate voltage.