The Thunderbolt Cable

Despite the $999 - $1999 price tag of the Promise Pegasus, it does not ship with a Thunderbolt cable. Apple currently offers a 2 meter long Thunderbolt cable for $49. As iFixit discovered this is an active cable with a Genum GN2033 transceiver in each connector:

Gennum GN2033 Transceiver in Apple's Thunderbolt cable - Image Courtesy iFixit

Thanks to all of the added components in the cable each connector is approximately 50.8mm long, much longer than the end of a standard DisplayPort cable.

The Genum transceiver and auxiliary components do generate heat under load. Using an IR thermometer I measured a connector surface temperature of 27.6C at the end plugged into my test MacBook Pro. The end plugged into the Pegasus R6 was warmer (presumably because of its close proximity to the drive cage) at 32.9C. Neither is too hot to handle but both are warmer than you typically expect from a cable plugged into the side (or back) of your computer.

The Pegasus: Hardware The Pegasus: Software


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  • Rdubs - Friday, April 20, 2012 - link

    Anyone know if I can throw in 4x 4tb 3rd party drives into a R4?
    What's the limit? Can't find a list of what mfg' s hard drives play well
    with R4.

    Many thanks
  • frabber - Thursday, October 25, 2012 - link

    anybody know whether this is possible? with some kind of thunderbolt enabled motherboard? Reply
  • odedia - Monday, April 14, 2014 - link

    WD RED 4TB drives are pretty affordable now, for the price of the 8Tb R4, I can get a diskless R4 and 4 red drives, resulting in 16tb total. They question is, would the RED drives match the performance of the R4? They are 5400 rpm drives, though quite reliable (much better than a green drive). Reply
  • badex - Thursday, December 31, 2015 - link


    Have had my pegasus R4 for a couple of years. its been effective but i think i'd like to take a step up to using SSD drives. what SSD drives would you recommend for the pegasus R4?

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