Is a PCIE X1 card for USB 3.0 worth it

expansionpci-express

I have a portable HDD on USB 3.0, and soon I'll have a 32gb flash drive on USB 3.0 as well.

My motherboard is pretty old – and the next time I'll upgrade it is when I get a new CPU/mobo/ram.

Slots on my mobo:

PCIE X16 – For my GTX 260

2xPCI

PCIE X1

I'm considering purchasing a PCI express X1 card like this – http://www.ebay.com.au/itm/PC-Laptop-2-USB3-0-Ports-PCI-E-PCI-Express-X1-Card-New-/280772000446?pt=AU_Networking&hash=item415f50babe

Now the question:

What are realistic (read/write) speeds I'll get in this setup, assuming I have 1 USB 3 device connected at a time, and the bottleneck is the PCIE?

Best Answer

Bandwidth for PCIe 1x is 250 [500]* MB/s

  • Note 1 - Since PCI Express is a serial based technology, data can be sent over the bus in two directions at once. Normal PCI is Parallel, and as such all data goes in one direction around the loop. Each 1x lane in PCI Express can transmit in both directions at once. In the table the first number is the bandwidth in one direction and the second number is the combined bandwidth in both directions. Also please note that in PCI Express bandwidth is not shared the same way as in PCI, so there is less congestion on the bus.

Source

USB 3.0 is also known as Super Speed

The new SuperSpeed mode has a transfer rate of 4.8Gbps

Real word speeds of 3.0 will be different depending on the chipmaker implementation, device connected and the chip it uses, and OS

Source

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