Crossfire even 5770 and 6670 on i5?

I know 5770 and 6770 can be crossfire but will it bottleneck on a core i5-760 2.8Ghz quad core? I have
Gigabyte P55A - UD3 motherboard, 4GB DDR3, 300GB IDE HDD currently with hd reason 5770

What is bottlenecking?
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More about crossfire 5770 6670
  1. No you won't bottleneck with that CPU. What power supply do you have though?
  2. 6770** GPU typo
    And I have a 540 Watt Antecedent gamer PSU. I think I have 2 or 3 pcie 6 pin power connectors
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