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  1. Join Date : May 2016
    Posts : 523
    Windows 10
       17 Oct 2016 #1

    Gigabit LAN to USB adapter


    Hi,
    I am looking to buy a Gigabit LAN to USB adapter and I have seen that all of them are USB3.0, but my PC has only USB 2.0.
    The question is, due the USB 2.0 limitation, the adapter will work only as 10/100Mbps LAN, 1GBps is not possible on USB 2.0.
    It that right?
      My System SpecsSystem Spec


  2. Join Date : May 2016
    Posts : 152
    Windows 10 Pro
       17 Oct 2016 #2

    What's the make/model of this adapter? Do you have a link for it?
      My System SpecsSystem Spec


  3. Join Date : May 2016
    Posts : 523
    Windows 10
       17 Oct 2016 #3

    Plankton said: View Post
    What's the make/model of this adapter? Do you have a link for it?
    USB 3.0 to Gigabit Ethernet Network Adapter - TP-Link

    There are many of such adapters around, I have been reading the specifications, but of course, they are not saying that for to use 1000Mbps LAN I need to have USB3.0 connection and I am quite sure it is necessary.
      My System SpecsSystem Spec

  4.    17 Oct 2016 #4

    Hi there

    Do the maths --simple enough

    Max USB 2 speed - even if you COULD get it is 480 Mb/s (Mega BITS / sec) . Your Mobo probably won't be able to handle the max USB 2 Bus speed so your LAN adapter will give you around 100 Mb/s. You won't get anywhere near the 1 Gb/s range !!! - not on USB 2.

    For Internet and general use this should be adequate enough -- don't though even THINK of transferring large files over this type of LAN connection.

    100Mb/s will give you around 9 MB/s (mega BYTES /sec) data transfer speed. Router throughput will also play a role here - domestic grade routers don't perform anywhere near the theoretical maximum (around 1.3 Gb/s for 5 GHZ wifi on ac standard).

    Afraid you can't break the Laws of Physics -- only solution is to get a laptop with a decent LAN adapter in it or a USB3 port --incidentally 5 GHZ wifi band on a normal domestic grade router in practice can only cope with a max wifi speed of around 633 Mb/s -- about half the theoretical maximum given cheap components, small antennae and often dodgy signals.

    USB 3.0 can transfer data up-to 5gbps (640MBps) so it should work with a 1Gb/s LAN connection connected directly to LAN.

    100Mb/s LAN will be enough to stream full 1080p HD content - but don't even DREAM of attempting to stream 4K or 8K video to those new 4K TV sets with that type of gear -- you'll be HUGELY frustrated with "buffering" etc and a lot of thumb twiddling !!!.

    @Adalwar - Yes you can use about 99% of those USB 3 --> Lan adpters on USB 2 -- I haven't actually see any marked "Not compatible with USB2" - but you'll only get USB 2 performance from them.

    A good one is the ANKER aluminium one -- has 3 tiny LED's too -- works on USB 2 with no problem.

    Cheers
    jimbo
      My System SpecsSystem Spec


  5. Join Date : May 2016
    Posts : 523
    Windows 10
       17 Oct 2016 #5

    @jimbo45,
    Thank you
    I was doing the "maths" before and precisely based on USB speeds I am sure 1000Mbps will not be possible on USB2.0.
    If I connect such Adapter in USB 2.0 port I will only get 100Mbps , not more.
    About buying a "decent" PC with USB 3.0, the funny thing is that the Motherboard has USB 3.0, Drivers have been automatically fully installed, but guess what: The USB connectors are USB 2.0! What a shame on LENOVO 100s, if I knew that before I would have not bought the PC. I have dismantle the Laptop to see if I could exchange the connectors, but no chance.

    EDIT: As a reference to USB 2.0 speeds, I have an external SSD and its Transfer speed does not go over 16MB/s, on USB2.0, while in USB3.0 it is over 200MB/s , droping after a while to 96MB/s I think because of HDD Speed.
      My System SpecsSystem Spec

  6.    17 Oct 2016 #6

    Adalwar said: View Post
    @jimbo45,
    Thank you
    I was doing the "maths" before and precisely based on USB speeds I am sure 1000Mbps will not be possible on USB2.0.
    If I connect such Adapter in USB 2.0 port I will only get 100Mbps , not more.
    About buying a "decent" PC with USB 3.0, the funny thing is that the Motherboard has USB 3.0, Drivers have been automatically fully installed, but guess what: The USB connectors are USB 2.0! What a shame on LENOVO 100s, if I knew that before I would have not bought the PC. I have dismantle the Laptop to see if I could exchange the connectors, but no chance.

    EDIT: As a reference to USB 2.0 speeds, I have an external SSD and its Transfer speed does not go over 16MB/s, on USB2.0, while in USB3.0 it is over 200MB/s , droping after a while to 96MB/s I think because of HDD Speed.
    Hi there

    @Adalwar

    slightly OT but the drop in SSD transfer speed on USB 3 for a "reasonably sized" file is probably due to the file transfer program (in this case probably File / Windows explorer) reading less than optimum block sizes from the data and the Mobo bus I/O controller having insufficient or no cache.

    A decentish SSD on a USB 3 port connected via a SATA-->USB3 adapter will probably average around 150 - 200 MB/s with a good Mobo.

    I have to admit though that it's strange that a computer has USB 3 ports but no connections available. !!!! I can understand the USB 2 ports being connected but the USB 3 ports should have some connectability somewhere.

    Another possibility is to use a pci-e USB 3 card but if the mobo bus speed isn't sufficient you'll be wasting your money !!!. A laptop usually has very limited expansion possibilities -- some though do have space for a small size pci-e card.

    Cheers
    jimbo
      My System SpecsSystem Spec


  7. Join Date : Aug 2014
    Forever West
    Posts : 2,366
    Win10 Home and Pro, Win7 Home, Linux Mint
       17 Oct 2016 #7

    [QUOTE=jimbo45;844961Another possibility is to use a pci-e USB 3 card but if the mobo bus speed isn't sufficient you'll be wasting your money !!!. A laptop usually has very limited expansion possibilities -- some though do have space for a small size pci-e card.[/QUOTE]
    I have 2 Custom Desktop computers with Win10, one with USB 3.0 on the motherboard and the other with an Add-in PCIe X1 USB 3.0 card with 4 USB 3.0 ports. The file transfer rates seem to be about the same in comparison. I don't know if the same could be said about using such a card in an older PCI slot.
      My System SpecsSystem Spec

  8.    17 Oct 2016 #8

    Berton said: View Post
    I have 2 Custom Desktop computers with Win10, one with USB 3.0 on the motherboard and the other with an Add-in PCIe X1 USB 3.0 card with 4 USB 3.0 ports. The file transfer rates seem to be about the same in comparison. I don't know if the same could be said about using such a card in an older PCI slot.
    Hi there

    The fact that the Mobo already has built in USB 3 capability probably means the Bus speed is fast enough so your Pci-e card should be fine (although some of the cheaper ones only work at about 75% of true USB 3 speed --still a whole lot better than USB 2).

    If the initial Mobo didn't have USB 3 capability then it's a question of luck --might work at decent speed or might give you small improvement like 55 - 60 MB/s instead of around 35 MB/s (max) for USB 2.

    Incidentally also OT but some old laptop HDD 2.5 inch spinners often perform surprisingly well when connected to USB 2 or USB 3 slots via the appropriate SATA-->USB connector. So don't throw them away if you upgrade to SSD's - useful for backups etc. !!! and can be used attached to desktop computers too via same adapter cables.

    Cheers
    jimbo
      My System SpecsSystem Spec


  9. Join Date : May 2016
    Posts : 523
    Windows 10
       17 Oct 2016 #9

    @jimbo45,
    Hi there,
    About the Laptop, yes Hardware supports USB3.0 but all case connectors are USB2.0! Next time, the China people will not f*k me so easy. Next time, I will not trust anybody and open my eyes very wide. But that is not the only f*k, the SD-Card reader only accepts max 32GB, do want you want.
    And I can do nothing, no Cards, no exchange connectors.
    Concerning USB3.0 speed there are several "bottlenecks" to consider:
    - USB3.0 will be max (generous "maths") 175 MB/s.
    - My HDD is a Hybrid one with also SSD incorporated, and Windows Test says write speed is around that 96MB/s.
    - I was copy a 4GB file from SSD to HDD, it was so quick that I even could not "Think" so quick, but 50% of time was 200MB/s then it droped to 96MB/s.
    Probably the HDD speed was the Bottleneck or/and USB3.0 slow down, becaus it could not handle the "handshakes"

    EDIT : It is a "Chinese Revenge" to be looking all the time to Device Manager and see all the USB 3.0 Drivers there, but you can not use it!
      My System SpecsSystem Spec

  10.    17 Oct 2016 #10

    These USB 3.0 adapters are generally backward compatible with USB 2.0. I just plugged in my StarTech USB 3.0 GbE adapter into one of my Lenovo notebooks (which have only USB 2.0 built in) and it fired up and worked immediately. Windows 10 knows how to find and install most of these drivers automatically, so they will work immediately following insertion in most cases.
    But of course, you'll be limited to the practical maximum for USB 2.0 when you use the network you attach to. Whereas my native GbE machines on my network get about 650 Mbps doing local file transfers, the best this USB 2.0 system will do is 333 Mbps. Still not terrible, though...
    HTH,
    --Ed--
      My System SpecsSystem Spec


 
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