That gap only widened when overclocked. Gaining 3 more fps when clocking at 797mhz (stock SC clocks) and another 3 when going to 850mhz.
For a total gain of around 15 FPS over the 6870. If you check the Metro benchmark thread you will see that a 570 overclocked to 850 will net you 51.5 fps whereas a 6870 CFX will net 70. So since the crossfire scaling is nearly 100% on the 6870s you can see that even at 1000core the 6870 will still only produce around 35fps. Which is what I was seeing.
And as you may or may not realize 15 fps in a game like Metro 2033 will make a night and day difference towards playable framerates at max settings.
Edited by blackbalt89 - 2/7/11 at 6:24am