Anybody have benches for bus powered vs self powered thunderbolt?

Discussion in 'Mac Accessories' started by Zellio, Apr 27, 2014.

  1. Zellio macrumors 65816


    Feb 7, 2012
    I've looked and looked and cannot find anything. I know bus powered is slower, but by how much depends on many variables.

    Plus, I already have a bus powered crucial m500 480gb drive that performs well (500 read/400 write, gets 380 read/340 write)
  2. FreakinEurekan macrumors 68040


    Sep 8, 2011
    Eureka Springs, Arkansas
    I can't see any reason bus-powered would be inherently slower. Self-powered might have a faster drive in it that draws too much to be bus-powered, but the difference is the disk, not the powering mechanism.
  3. g4cube macrumors 6502a

    Apr 22, 2003
    What FreakinEurekan says is true. Only difference in performance should be the SSD or HDD inside, or the bridge controller.

    That being said the J2 product from Promise did have the ability to reduce performance when bus powered to adjust the the Thunderbolt bus power available. Best performance comes when AC powered.

    The J2 product is the only one that comes to mind with this capability.

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