I have finished my Maximus IV Extreme build...Flipped the switch yesterday and...all was great.....except one issue.

The Revodrive X2 that I have in the bottom PCIe 4x slot is only running at half speed (400MB read in ATTO) vs the advertised (740MB Read). Will not be back in town until Friday SO I will have to wait to start overclocking this beast until then, but was hoping someone might have some ideas why it is only running at half speed...I have been trying to think what the cause might be:

1.) PCIe Lanes are maxed??
2.) Bios issue with bandwidth in the 4x slot..

When I get back on Friday I plan on switching off a couple of the 580's to see if the Revodrive speeds up...that might tell me if it is a PCIe saturation issue...If not it might be a bios issue...I was also thinking of removing the Sound card from the 1x slot to see if that has any effect.

Thanks,

-M