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Thunderbolt vs PE4H V3.2 (PCIe x1 Adapter)

Iam little confused on technologies like thunderbolt and PE4H V3.2 .both technologies helps to add external graphics card using thunderbolt port and express card.In this which perfoms better like desktop GPU.I want to add an external graphics card(GTX 780 TiTan) to Asus ROG G750JX.which way is best to add desktop Graphics card for laptop.
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  1. Best answer
    Thunderbolt doesn't really support the required bandwidth for a PCIe videocard. Thunderbolt is only 20Gb/s, PCIe v4.0: 31.51 GB/s (256 GT/s) (bytes, not bits)

    v4.0: 31.51 GB/s (256 GT/s) only supports 1 lane, it's still a massive bottleneck.

    I wouldn't waste any money on a videocard for this, just get a GT620, that's about all the performance you will get anyway. You could build a faster system for the cost of the 780.
  2. You are right.PE4H only support 1 line.what is the total data rate of a PCI x16 slot?
    Is there any technology that add external video card to laptop which support the same data rate of pci x16 slot?
  3. Nawab Khan said:
    You are right.PE4H only support 1 line.what is the total data rate of a PCI x16 slot?
    Is there any technology that add external video card to laptop which support the same data rate of pci x16 slot?


    38 GBps, around 300 Gbps, 10x the speed.

    No, just buy a desktop if you want to play games. It's a waste of money trying to setup an external GPU.
  4. That means external GPU in Laptop Wont provide the same perfomance of desktop?
    i have a doubt that PE4H uses x16 slot for graphics card.Then why dont get the same perfomance like desktop?
  5. No, not even close. The memory cannot be accessed fast enough to make the card worthwhile.
  6. how much will be the decrease in perfomance as compared with desktop graphics and external gpu PE4H
  7. It's not really worth testing, it doesn't even support GPU's

    http://www.hwtools.net/Adapter/PE4H.html

    The only other option is the GUSII, and it only supplies like 75W of power. You might get a 750 Ti on there, but it won't run fast enough.

    That defeats the whole purpose of having a dedicated GPU.

    I'd test with an old PCIe card and see if it even works before buying a $1200 card that will be bottlenecked on your processor and PCie 1x speeds.
  8. Thank you for your suggestion
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