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Windows 7: Why no 3 port USB 3.0 pci cards

08 Jan 2011   #1

Windows 7 professional 64 bit
Why no 3 port USB 3.0 pci cards


Looking to add some external USB 3.0 hard drives to my Windows 7 machine. Would like to have add least 3. Is there a restriction/limitation with USB 3.0?
I only see cards with a max of 2 ports.



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08 Jan 2011   #2

Windows 7 ultimate 64 bit / XP Home sp3

Welcome to Seven Forums.
Can't explain why but I also couldn't find any. Thought for a minute I found one but not!
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08 Jan 2011   #3

Windows 7 Pro x64 Bit

It is the controler chip that the mb makers are using ( they all use the same chip). The chips only support 2 devices. I could be because of driver limitations but I am think that it is a bandwidth limitation of the controler chips. Once there is a intigrated controler in say a amd bridge then the amount of ports will go up. I do not think you can buy a mb with more then 2 usb 3.0 ports. I have seen one with a usb 3.0 internal header and a coputer case that has a built in port (corsair I think).
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08 Jan 2011   #4

W7PRO/ULT 32/64

Renesas (NEC) first developed only a two port USB3 chip. They now have a 4 port USB3 chip that should be available sometime this year.

I do not know if other manufacturers have developed more than a 2 port chip.
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08 Jan 2011   #5
Microsoft MVP

Windows 7 Ultimate SP1 X64 (Windows 10, 8.1, Linux Mint, Windows XP and others in VM)

The Asrok 890FX delux4 has 2 external USB 3.0 ports and a USB 3.0 on board header, but it is rather rare.
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08 Jan 2011   #6

Windows 7 professional 64 bit
Thanks for the replies


I want to thank all who took the time to read and reply to my query. Based upon the news of the 4 port chip, I will buy my storage but wait until the 4 port chip is available.


My System SpecsSystem Spec
09 Jan 2011   #7

Windows 7 Ultimate 64bit

unless you are looking for something that u can hotswap and move around i would recommend setting up raid instead of just adding a bunch of external drives
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 Why no 3 port USB 3.0 pci cards

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