External Graphics cards a possibility with USB 3?

Discussion in 'MacBook Pro' started by whitedragon101, Oct 1, 2010.

  1. whitedragon101 macrumors 65816

    Sep 11, 2008
    Several manufacturers have tried to produce external graphics card boxes to connect to your laptop. Most have given up, but it seems the only real barrier is bandwidth.

    MSI have this:

    using the Expresscard 34 (max 2.5Gpbs) and say they will switch to USB 3 (4.8Gbps) when it goes mainstream.

    Do you think 4.8Gbps is enough to make connecting high end external graphics cards to your laptop a possibility?
  2. Guiyon macrumors 6502a

    Mar 19, 2008
    North Shore, MA
    Possibly, albeit a low one, I wouldn't expect anything really high performance and forget gaming. For comparison, IIRC, each PCIe 2.0 lane allows for up to 500MB/s (or about 4Gbps) or 250MB/s / 2Gbps for PCIe 1.0. The vast majority of desktop chipsets use a 16x link and most IGPs use a 4x+ link (could be wrong here...); that's 8Gbps of potential bandwidth to use at the low end.

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