USB 3.0 card = USB 2.0 speed?

[Scallica]

I have a Rosewill RC-505 PCIe USB 3.0 card installed. The card was working fine for months, but then I noticed that my USB 3.0 devices were only 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 fine when it was installed in the first PCIe slot; the only issue was transfer speed.

[barnabas1969]

Do you have a USB thumb drive that can transfer at faster than 35MB (mega-bytes) per second? That's the maximum transfer rate of USB 2.0. I've never seen a thumb drive that fast.

[Scallica]

Yea, I have the Corsair Voyager 32GB USB 3.0:
http://www.newegg.com/Product/Product.a ... alParent=1

I also have a Seagate FreeAgent which is USB 3.0:
http://www.newegg.com/Product/Product.a ... 6822148663

Both devices demonstrated slow speed and caused a warning bubble to appear. After swapping PCIe slots, no more issues.

[barnabas1969]

Wow, that flash drive smokes! Never saw one that fast.