How do you guys get around the issue of not having enough PCI-E connections? I have a 850W PSU which should be able to manage 3x5870. But it only has enough PCI-E cables for 2 cards. Are these adapters fine :

PCI Express 6-Pin to 4-Pin Power Adaptor for PCI-E Graphics Cards

http://www.overclockers.co.uk/showproduct.php?prodid=CB-033-OK