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ZipZoomFly has the Sharkoon SHK PAUSB3-1 USB 3.0 Controller Card for $33 - $10 rebate [Exp 8/15] = $23 with free shipping. Features 2 USB 3.0 ports, data transfer rates of up to 5 GB/s, PCIe interface and is backwards compatible to USB 2.0.
PCIe 1x slot only has 1gb/s (500mb/s each way) of bandwidth on a motherboard with PCIe 2.0, on 1.0 and 1.1 its half that... so dont get your hopes up to get the 5gb/s thats being advertised
@ mikefletcher85- Thanks for your input.
@Trollsprinkler- Thanks for your sarcasm.
@phoshzzle- Thanks for your stupidity.
#1's point is fairly irrelevant for two reasons.
1) 5Gbps is gigaBIT, actually 4.8 so that's 600MBytes/s on paper... just as 480Mbits/s for USB2 is only on paper - actual, real world throughput is below the PCIe 1X bottleneck.
2) You can't buy anything that exceeds 400MB/s throughput and uses USB3. Maybe someday, but why would you pay hundreds for such a device that uses the cheaper, slower USB3 bus? Maybe on a thumbdrive only so you have backwards compatibility with legacy systems.
I take back part of #2, limited cache transfers from a current or future generation external USB3 connected SATA HDD or SSD could peak above 400MB/s, but you'd only notice the difference on select synthetic benchmarks.
Bottom line - if you could get a PCIe 4X USB3 card it would be a waste of the 4X slot on it if you also had a 1X slot alternative, unless you were trying to do something wierd like make a high traffic fileserver out of multiple drive volumes connected by USB3, and of course your card had more than two USB3 ports on it or they were plugged into a USB3 hub daisey chained to it.
The real question is would this card offer significant improvement over USB2 to justify the twenty-something price and the answer is yes, we are at the point where lots of devices saturate USB2.
@mdheinzer- Thanks for nothing.