RM850 and crossfire cabling

Jullutin

Honorable
Feb 4, 2014
7
0
10,510
Hi
Might be stupid question but i need some confirmation to following:
im planning to install crossfire saphires r9 290 vapor-x gpus. PSU is Corsairs RM850.

Is it okay to install 2 power cables so that each dual pcie cable powers one card or should i share them so each powers both cards? PSU had only 3 dual pcie cables with it so all power inputs cant
have seperate power feed. or do i need to find that 4th cable somewhere?
Those cards have quite an appetite, so can psu keep in pace?
High definition illustration:
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