Questions about Thunderbolt...

Discussion in 'MacBook Pro' started by applegenius83, May 11, 2011.

  1. applegenius83 macrumors newbie

    Joined:
    Apr 27, 2011
    #1
    So I hear thunderbolt is 10 Gbps transfer, but it has 2 channels and they are each Bi-Directional. That gives a total of 40 total Gbps bandwidth? Does that mean that in theory it is possible to be transferring 20 Gbps with one device over two channels? I know that's insane speed, but I'm thinking graphics cards here.
    I've seen the ViDock: http://www.villagetronic.com/vidock/index.html where you're able to connect external GPUs, I'm really wondering if that's going to be possible over thunderbolt in the future. Would 10 Gbps be a bottleneck on the GPUs? Do GPUs, although they are connected to PCI x16 which is much faster, actually harness all that PCI speed? Or only for graphics intensive software/gaming?
    Also, if I were to daisy chain thunderbolt SSDs or HDDs, does that mean one uses channel 1 and the other uses channel 2? Can you still get 10 Gbps (or 20 multichannel) with each device?
    Thanks in advance. :apple:
     
  2. pdjudd macrumors 601

    Joined:
    Jun 19, 2007
    Location:
    Plymouth, MN
    #2
    I believe each channel is for the daisy chaining and not going to be useful for one device.
     
  3. 8CoreWhore macrumors 68020

    8CoreWhore

    Joined:
    Jan 17, 2008
    Location:
    Big D
    #3
    Actually, 1 Thunderbolt port has 2 channels - each with 10Gbps. So, a total of 20Gbps.

    Regarding external GPU, it is PCI-E, so yes, an external GPU can be used when they add TB.

    The new larger iMacs have 2 Thunderbolt ports. Wowzers.
     
  4. rnelan7 macrumors 6502

    rnelan7

    Joined:
    Nov 9, 2009
    Location:
    Boise
    #4
    You are mixing up bits and bytes. Eight bits make one byte which is Big B and bit is small b. Thunderbolt is 10Gb so it is actually 1.25GB per second.
     
  5. applegenius83 thread starter macrumors newbie

    Joined:
    Apr 27, 2011
    #5
    Actually, I never did. In my post I only said Gbps, meaning gigabits per second.

    Actually, 1 Thunderbolt port has 2 channels - each with 10Gbps. So, a total of 20Gbps.

    Regarding external GPU, it is PCI-E, so yes, an external GPU can be used when they add TB.

    The new larger iMacs have 2 Thunderbolt ports. Wowzers.


    So would I be able to harness that kind of power with an external GPU?? TWO externals on the iMac? Daisy chain external graphics cards? Wowzers is right!! :apple:
     

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