Gigabit Ethernet and USB3 over PCI-E 2 x1

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MatthewGB

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Jun 15, 2016
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My H61 motherboard doesn't come with USB3 or Gigabit ethernet, so I'm planning on buying this: http://www.ebay.co.uk/itm/GIGABIT-ETHERNET-LAN-3-PORT-USB-3-0-TO-PCI-E-CARD-PC-ADAPTER-CONVERTER-FOR-PC-/252279642098?hash=item3abd09d7f2:g:9qwAAOSwKtVWtvaR
The PCI-E slot has a maximum throughput of 500MBps, so does that mean that both the USB3 and ethernet port will have a maximum of 500MBps when only one is used at once, or does it try to split the PCI-E slot's bandwith for each port, even when only one is in use?
 
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greens
PCIE 2.0 does have a max of 500MB/s per lane, but note that its Megabytes per Second.
Gigabit LAN (note the "bit") pushes only 125MB/s, even in full duplex that is only 250MB/s... you won't be running full duplex gigabit LAN anytime soon, but just for the sake of argument...
That leaves another 2 gigabits for your USB 3.0 drives, or another 250MB/s.

You are not going to hit those speeds while this motherboard is in use. Maybe in our life times - but not any time soon.

TL:DR PCI E is fast, even x1 is more than you'll ever use.
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greens

greens

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Jan 27, 2012
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PCIE 2.0 does have a max of 500MB/s per lane, but note that its Megabytes per Second.
Gigabit LAN (note the "bit") pushes only 125MB/s, even in full duplex that is only 250MB/s... you won't be running full duplex gigabit LAN anytime soon, but just for the sake of argument...
That leaves another 2 gigabits for your USB 3.0 drives, or another 250MB/s.

You are not going to hit those speeds while this motherboard is in use. Maybe in our life times - but not any time soon.

TL:DR PCI E is fast, even x1 is more than you'll ever use.
 
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