Yep, that board has X8 slots when both are used. However, modern cards have been tested, and it's made no difference with cross firing. I doubt it would really make a difference until 2 6990s are used. I have the M4A89GTD Pro, and it also was very easy to unlock a tri-core, as well as goose it to 3.6+ Ghz on 1.4 volts (not terrible imo, although the chip will do no more, even up to 1.55 volts). The board is also the coolest running AM3 board I've dealt with, and I've dealt with the MSI 790FX-GD70, Gigabyte 890FXA-UD5 and 890GPA-UD3H as well. The UD3H has a DRMOS section, like MSI. It doesn't seem to overheat, but I'm unsatisfied with the temps it runs. To date, after 24 hour testing in a warm room (75F) the Asus ran around 79F for chipset and MB temps. There is no need to worry about feeding it much airflow. For that, as well as solid stability and overclocking, it wins my award, given the price. I've seen reviews for the Biostar, and think it might be pretty good as well, although with less options than the Asus.