SPL is a great overclocker this without question, is a famous overclockers giorgioprimo which has always brought up in Italy and also not being discussed now proved what you can do, because envy is an ugly beast:
http://www.hwbot.org/submission/2197367_spl_3dmark2001_se_radeon_hd_3870_115210_marks
Great Scores Compliments SPL !!!