Thunderbolt 2 to four PCIe expansion module

Discussion in 'Mac Pro' started by FireWire2, Apr 28, 2015.

  1. FireWire2 macrumors 6502

    FireWire2

    Joined:
    Oct 12, 2008
    #1
    I know there are TBolt2 Expansion module but only one or two slots

    Can any point to me a Thunderbolt 2 to four PCIe x1 V2 expander out there?

    TIA
     
  2. Synchro3 macrumors 65816

    Synchro3

    Joined:
    Jan 12, 2014
    #2
    I don't think that something like this exists.
     
  3. Demigod Mac macrumors 6502a

    Joined:
    Apr 25, 2008
  4. vkohlhorst macrumors newbie

    Joined:
    Apr 29, 2015
    #4
    Magma

    Magma offers several Thunderbolt expansion solutions, 3 Slots is the most in one enclosure, but if you need more slots, it is simple to daisy-chain multiple chassis to get to the number of slots you need.

    http://www.magma.com/catalog/thunderbolt-2-expansion

    Contact me if you have any questions.
     
  5. FireWire2 thread starter macrumors 6502

    FireWire2

    Joined:
    Oct 12, 2008
    #5
    Thank you all - i did checked out those options - cost is quite high

    Got to come up with something else
     
  6. fuchsdh macrumors 6502a

    Joined:
    Jun 19, 2014
    #6
    Yeah, it's a shame that the price skyrockets if you want even one full-length card—there's plenty of affordable half-length x8 and x16 chassis options from Sonnet or OWC that start at just $300. I haven't seen even a single-slot full-width option.
     
  7. MacVidCards Suspended

    Joined:
    Nov 17, 2008
    Location:
    Hollywood, CA
    #7
    Sadly, at least one manufacturer of serious "Pro" level equipment has written off TB.

    The fact is that plenty of people would LOVE to offer TB enclosures for GPUs. However, neither Apple nor Intel has anything to gain so they have put a consistent series of tedious roadblocks in the way.

    Here is what Cubix had to say last summer in answer to a question from someone wanting to move to nMP:

    The Xpander you have is operating at data transfer speeds of 80Gbps bi-directional. A Thunderbolt 2 port is only capable of operating at 20Gbps bi-directional. Neither Intel nor Apple currently support discrete graphics cards residing in an external PCIe slot expansion chassis connected to the host via Thunderbolt.

    Cubix had planned to release its own line of Xpanders using Intel Thunderbolt 2 technology during the late June timeframe. Due to a variety of factors, not the least of which is the current lack of Intel and Apple support for discrete GPUs hosted in an external slot expansion chassis or the 20Gbps data transfer speed limitation, Cubix has opted to focus its development efforts on its new PCIe Gen3 x16 (128Gbps data transfer rate) Xpander models plus its HostEngine dual Xeon-based workstations.

    Eric Fiegehen
    Director, Visualization & GPU Compute Solutions
    Cubix Corporation
     
  8. FireWire2 thread starter macrumors 6502

    FireWire2

    Joined:
    Oct 12, 2008
    #8
    Based on what i know Thunderbolt 2 is a x4 lanes system, if you are trying to get 8x or 16x, it DOES NOT support. even with Sonnet or OWC - only connects at 4x lanes @ 5Gb/s. The manufacture TB expander tells you it runs @ x8 or x16, that is not true!

    Fortunately, my clients applications need 1x or x2 lanes PCIe like
    USB 3.1 card : http://www.datoptic.com/ec/usb31-host-for-mac-windows-and-linux.html
    eSATA 6Gb/s Support PM: http://www.amazon.com/e-SATAIII-support-Multiplier-works-Windows/dp/B00DJ9SM9A
    and Avid Digidesign HD1 Core PCIe with 96 I/O, iLok 2 & Pro Tools

    That would be perfect, without wasting any lanes
     
  9. fuchsdh macrumors 6502a

    Joined:
    Jun 19, 2014
    #9
    Oh I'm aware you only get limited speeds (although as eGPU experiments have shown, in many to most cases that bandwidth limitation on paper doesn't translate to heavy losses in real-world performance.) But I'd be much more interested in an eGPU option for my associated peripheral computers if I could get a double-width, full-length, single-slot chassis. That option doesn't seem to exist, as far as I've seen.
     
  10. Flint Ironstag macrumors 6502a

    Flint Ironstag

    Joined:
    Dec 1, 2013
    Location:
    Houston, TX USA
    #10
    A shame that Cubix has dropped development of their product. Or perhaps more accurately - it's a shame Apple and Intel aren't supporting this.

    Now that I'm offloading my heavy processing to a linux cluster, I could seriously live with a base nMP plus external GPU for occasional gaming at maximum settings.
     
  11. AidenShaw macrumors P6

    AidenShaw

    Joined:
    Feb 8, 2003
    Location:
    The Peninsula
    #11
    T-Bolt was a solution in search of a problem. Apple had to "create the problem" by removing other ports and PCIe.

    The best thing that you can say about it is that it is better than FireWire.

    It was crippled by the requirement to carry DisplayPort as well as PCIe traffic.

    It was far outclassed by native PCIe (and the external PCIe that's coming to market).

    If T-Bolt did PCIe 3.0 x16 it would be a contender. PCIe 2.0 x4 forced to co-exist with an old revision of DisplayPort is lame.
     
  12. MacVidCards Suspended

    Joined:
    Nov 17, 2008
    Location:
    Hollywood, CA
    #12
    The double stupidity of the situation was started with demanding that TB include DP. Nobody needed or wanted that. I can see bundling audio with video , but Data and Video are not the same thing.

    The second part of the stupidity was the pig headedness they have shown about licensing TB out to the lucky few. They have gone out of their way to not allow eGPUs. They allow a wonderful chassis, but limit the power to 25 Watts so that it can't run GPUs, despite the fact that PCIE is supposed to have 75 Watts. That is the $200 option.

    If you get a chassis with both power and space for a GPU, it's $1,000.

    Think about that. For the honor of using a device at 1/4 (or 1/8th now) of it's bandwidth, you need to pay $1,000 cash. And this for an ability that used to be FREE. (at full speed)

    A little company called B-Plus put out a cheap and useful TB2 board called the "TH05". Apple and Intel shut them down like a light. Can't have people making inexpensive and useful TB stuff, it needs to be artificially limited and expensive.

    The entire situation is absurd. I have tried to help the eGPU community. Turns out that all recent Apple products have had increasing difficulty using eGPUs. My 2012 rMBP can run one with ease. So far testing with the 2015 MBP has been stymied.

    So, take away the ability to upgrade GPUs to keep up with the market, offer TB as a replacement for PCIE, but then restrict TB from doing the thing that most folks would want to use it for. And then wonder why nobody is drinking the TB Kool-Aid.

    I guess it's time to buy an iWatch and fiddle with some apps for fun.
     

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