New iMac 21.5" - Multiple Displays

Discussion in 'iMac' started by Wrathh1965, May 17, 2011.

  1. Wrathh1965 macrumors newbie

    May 15, 2011
    With the advent of the Thunderbolt port, and the existing mini display port, is it possible to hook up 2 external displays and utilize them for gaming (such as HL2, Portal 2)?

    The additional displays I have are older Acer 16:10 22" displays. I still need to check if I can set them to the same resolution as the iMac display.
  2. Badger^2 macrumors 68000


    Oct 29, 2009
  3. Wrathh1965 thread starter macrumors newbie

    May 15, 2011
  4. mrfoof82 macrumors 6502a

    May 26, 2010
    Lawton, OK
    Although you can use USB2 to drive external displays, it is not recommended for gaming. Even for regular productivity applications, the lack of bandwidth that USB2 can supply is noticeable as the mouse cursor stutters along during redraws.

    USB2 absolutely does not have the bandwidth to drive a 1680x1050 display at 32bpp at its native refresh rate (which is probably 60Hz). Get an appropriate DisplayPort->whatever (probably DVI or HD15 VGA) adapter) and pop it in your ThunderBolt port. The second external display can be driven via USB2, but again, I caveat that it will not prove adequate for gaming.

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