What is CF in X4 mode and X8

What is CF in X4 mode and X8 .......because i find only x4 modes in most budget H77 boards ........its for my friend he has two ATI Radeon 6770's and he wants to CF them........Plz help me with this X4 and X8
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More about what mode
  1. 4x and 8x refers to the speed of the bus. Hence, you are finding the lower speed in most budget boards.

    If you can spring the cash go for the 8x. But 4x should perform well in most cases, also.

    For 6770s the 4x should be fine.
  2. You can't crossfire on a budget H77.
  3. Depends on the card, game/benchmark and what version of PCI-E were talking about (1, 2, or 3)

    Worst case scenario, a GTX680 loses 27% of it's performance using a PCI-E 1.1 slot at 4x. A HD7970 in the same scenario loses 14%.

    Today's PCI-E 3.0 slots at 4x have as much bandwidth of a PCI-E 2.0 slot at 8x, which is just fine.

  4. The Motherboard is


    is a 6770 CF in this setup better than a GTX 560ti.....how much
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