If you use the lowest PCI slot on the board for a Intel750, it will get [email protected] and doesnt steal bandwidth from any other slot.
That leaves you being able to use PCI_E#1 (the top long one) for a single card and you get 16X.
Then either PCI_E#2 or 4 for a second card in SLI, but with a 5820K PCI_E#2 operates at 8X
PCI_E4 shares with PCI-E#1, so with both in use for SLI you get 8X/8X.
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Lots of nice RAM out,
https://www.overclockers.co.uk/showproduct.php?prodid=MY-098-AR&groupid=701&catid=8&subcat=1392
https://www.overclockers.co.uk/showproduct.php?prodid=MY-184-GL&groupid=701&catid=8&subcat=2423
https://www.overclockers.co.uk/showproduct.php?prodid=MY-097-GS&groupid=701&catid=8&subcat=2424
That leaves you being able to use PCI_E#1 (the top long one) for a single card and you get 16X.
Then either PCI_E#2 or 4 for a second card in SLI, but with a 5820K PCI_E#2 operates at 8X
PCI_E4 shares with PCI-E#1, so with both in use for SLI you get 8X/8X.
-----------------------
Lots of nice RAM out,
https://www.overclockers.co.uk/showproduct.php?prodid=MY-098-AR&groupid=701&catid=8&subcat=1392
https://www.overclockers.co.uk/showproduct.php?prodid=MY-184-GL&groupid=701&catid=8&subcat=2423
https://www.overclockers.co.uk/showproduct.php?prodid=MY-097-GS&groupid=701&catid=8&subcat=2424