I HAVE POWERCOLOR HD 5970 GAMES ARE WORKING OK BUT I HAVE INTALLED 3DMark Vantage SO HE GIVED IT ONLY BETWAEN 14000 TO 15000 SCORE IN OTHER SITES THEY SCORED IT THAN 22000 WHAT THE PROBLEM WITH MY CARD OR DOES IT OK !
Second, what are your full system specs? Your processor might be affecting your score. Also try a game benchmark and see how your FPS matches up to those in reviews.