The ideal temps under load are 40 to 48 so you are fine there. Either bump the vcore a tiny bit more or drop the fsb down like
10mhz. I looked into your multiplier and it seems that the beauty of the black edition was an unlocked multiplier. Your board supports up to 25x not that you would want to run it that high. Seems a bit strange you cannot change that. Done any benchmark comparisons vs stock?