Will a PCIe express to USB 3.0 operate in full bandwidth in a X1 slot. I am installing an 8 port 3.0 card for external Drives. I want the full 5GBS speed. I seem to recall the x1 slot will not support 5 GBs. Should I put it in an PCIe x16 slot to get full bandwidth or is that not possible with a PCIe x1 card?
USB 3.0 PCIe card in x1 vs x16 slot
- Thread starter navyjoe
- Start date
Solution
If it's only an X1 card, inserting it into a slot with more pins isn't going to increase the bandwidth.
Depending on the version of PCI-X you're using, here's what you can expect....newer motherboards are going to have version 3.0 or 3.1 normally.
If you have at least version 2, you will have 4 Gbit/s which will be completely saturated, but version 3 tops out at 7.877 Gbit/s which would give you a little headroom for USB3
Depending on the version of PCI-X you're using, here's what you can expect....newer motherboards are going to have version 3.0 or 3.1 normally.
If you have at least version 2, you will have 4 Gbit/s which will be completely saturated, but version 3 tops out at 7.877 Gbit/s which would give you a little headroom for USB3
getochkn
Polypheme
- Jul 2, 2006
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From the manual
"The PCI Express x1 slots are fully compliant to the PCI Express Gen2 (version 2.0)."
So they will have 500MB/s bandwidth.
USB 3.0 can use 640MB/s. So you won't get full speeds.
2x4 port cards would help spread the load a bit. Not sure if they 4x cards that you could use in the 16x slot.
"The PCI Express x1 slots are fully compliant to the PCI Express Gen2 (version 2.0)."
So they will have 500MB/s bandwidth.
USB 3.0 can use 640MB/s. So you won't get full speeds.
2x4 port cards would help spread the load a bit. Not sure if they 4x cards that you could use in the 16x slot.
Dark Lord of Tech
Retired Moderator
- Aug 18, 2009
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Wow, I totally missed that. Thanks. I have since dug a little deeper and if I understand it all correctly the Amd southbridge chip runs the two PCI X1 connectors in addition to the onboard USB 20 and Sata controllers. So since I am mostly using the USB 3.0 to move data between external drives and SD cards I suppose it would make sense to use the X1 slots anyway. Thanks for the excellent assistance.
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