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Discussion Starter · #1 ·
I have a Rosewill RC-505 PCIe USB 3.0 card installed in the first available PCIe x1 slot. The card performing at USB 3.0 speeds for months, but then one day I noticed that my USB 3.0 devices suddenly started operating at USB 2.0 speed. When I plugged in a USB 3.0 thumb drive into the card, I received a warning bubble saying "your device will perform faster in a USB 3.0 port". I did the following:


--Rebooted the system

--Re-seated the 4-pin Molex power connector on the card

--Replaced the card with an identical card


None of the above worked. I moved the (replacement) card from the first available PCIe slot to the second available PCIe slot. No more warning bubbles and file transfers are back to USB 3.0 speed! So I guess there is an issue with the first PCIe slot. Is that possible? The USB3.0 card was detected by Windows 7 64-bit fine when it was installed in the first PCIe slot; the only issue was transfer speed.
 

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First off, you did not state what Operating System you are using. Second, need to know if this a computer you or someone built for you, what is the motherboard model# and make if custom built, or if it is a off the shelf OEM system, what make & model# of the OEM system.


If I had to guess, a driver is the problem here. How many USB devices do you have hooked up to the card total?
 

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Discussion Starter · #4 ·
Thanks for the replies. I custom built this system myself. The motherboard is a Gigabyte GA-EP45-UD3R. The OS is Windows 7 64-bit.


To clarify my original post, the USB 3.0 card was installed in the first available PCIe x1 slot and was performing at USB 3.0 speeds for months. One day, I connected a USB 3.0 thumb drive and received a warning bubble about "this device will perform faster in a USB 3.0 controller". I did a file transfer and the transfer speed was in the 2.0 range. I also received the same warning when I connected my external hard drive which is USB 3.0.


As of now, I have a replacement USB 3.0 card in the second PCIe x1 slot and it's working fine. Is it possible the first PCIe x1 slot is malfunctioning?
 

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What chipset is that card? If it's the NEC/Renesys chipset, I'd recommend you throw it out and buy something else - I've seen nothing but problems with their chipset. Aside from that, make sure the card has the latest firmware/drivers
 

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Any other chipset. I've constantly seen problems (mostly with USB 2.0 backwards compatibility, but they have been so prevalent with it that I wouldn't trust it) with it.


Also, at the risk of asking a stupid question - you are using a USB 3.0 cable, aren't you? They are not the same as USB 2.0.
 

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Discussion Starter · #8 ·
Yep, the cable has blue ends! I also ruled out cable issues by plugging the USB 3.0 thumb drive directly into the card; the warning bubble still appeared. The card is working fine now in the second PCIe x1 slot so I will leave it alone!
 

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Sadly, this is common for USB 3.0 chipsets right now. The drivers just don't work well with the Windows OS. The next version of Windows and the upcoming USB 3.0 revision next year are supposed to make things more uniform across the board.
 

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Quote:
Originally Posted by Scallica  /t/1471081/usb-3-0-card-usb-2-0-speed#post_23334766


Well, my USB 3.0 card is running at 2.0 speed again! That's too bad about the USB 3.0 chipsets. Although, out of curiosity, I would like to try another card. I'm considering the one by SilverstoneTek which uses an NEC chipset.

http://www.silverstonetek.com/product.php?pid=364&area=en

That's the same thing - NEC spun off the division that makes the USB controller chips and it is called Renesys.
 
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