Sapphire 7970 OC vs Vapor-X GHz 3GB vs GHz 6GB vs Toxic

I just have a couple of questions about these 4 cards. First can the standard OC 7970 overclock as high as the others, including the toxic?

Does the Vapor-X cooling make a difference when OCing?

Can the Toxic OC higher than the other 7970's I listed?

Is the extra VRAM of the GHz 6GB and Toxic useless even when gaming in 3D but on a single monitor?
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  1. It's your processor that makes all the difference.
    Check your motherboard manufacturer website for the list of video cards that are compatible w/ your motherboard.
    If you don't have at least quad core, then start over.
  2. OS: Windows 7 Home Premium 64-Bit OEM
    MoBo: MSI Big Bang Z77 MPower LGA 1155
    RAM: Corsair Vengeance LP Black 8GB (2 x 4GB) 1600
    CPU: Intel Core i5-3570K Ivy Bridge 3.4GHz Quad-Core
    HSF: Noctua NH-D14
    SSD: SAMSUNG 830 Series 128GB
    HDD: SAMSUNG Spinpoint F3 1TB 7200RPM
    PSU: Corsair Professional Series Gold AX750
    ODD: ASUS DVD Burner OEM

    These are the rest of the components, I do have a quad core and will be OCing it. So no need to start over. =p
  3. I guess it's really between the6GB GHz 7970, the 7970 Toxic and a 4GB 680 wich is more of the middle ground between the 3.
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