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SIIG, Inc > 
Item#: 9SIA24G28M4406

SIIG 2-port PCIe host adapter with 1 external & 1 internal SuperSpeed USB 3.0 ports Model JU-P20512-S1

  • PCI Express to USB Card
  • USB 3.0
  • Up to 5.0 Gbps Data Transfer Rate

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

SIIG’s DP SuperSpeed USB 3.0 2-Port PCIe i/e is a high performance adapter card designed to instantly add two additional USB 3.0 ports (one internal and one external) to your PCIe-enabled desktop computer. Its USB 3.0 interface delivers ultra-fast USB 3.0 data transfer rates of up to 5Gb/s (10 times faster than USB 2.0), and allows you to hot-swap devices (connect and disconnect) without first turning your system off. It also offers backward compatibility for USB 2.0 and USB 1.1 devices and supports the simultaneous operation of USB 3.0, USB 2.0 and USB 1.1 devices.

This dual profile USB 3.0 2-Port PCIe host adapter works with a wide variety of high-bandwidth USB 3.0 devices, including USB 3.0 hard disk drive enclosures, high-resolution webcams, video surveillance cameras, digital video cameras, and multi-channel audio devices. The dual-profile PCB design along with the included spare low profile bracket allows this USB 3.0 adapter to be installed in either standard height or low profile systems providing the utmost flexibility in system chassis installation.

  • newegg Adds USB 3.0 Connectivity to PC Quickly add two SuperSpeed USB 3.0 (1 external & 1 internal) ports to your PCI Express-enabled computer for up to 5Gbps of data transfer rates between the peripherals and your host. Internal SuperSpeed USB port is perfect for connecting to front-chassis USB hubs or devices.
  • newegg PCI Express Interface The utilization of PCI Express interface (Revision 2.0) ensures adequate bandwidth for bottleneck-free data transfer.

Learn more about the SIIG, Inc JU-P20512-S1




PCI Express to USB Card
External USB Ports
1x USB Port
Internal USB Ports
1x USB Port
USB 3.0
Data Transfer Rate
Up to 5.0 Gbps


Package Contents
2-port PCIe host adapter with 1 external & 1 internal SuperSpeed USB 3.0 ports
Spare Low Profile Bracket
Driver CD
User Manual

Manufacturer Warranty

2 years limited
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 0 day
  • Read full details

Customer Reviews of the SIIG, Inc JU-P20512-S1

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  • Dale P.
  • 1/17/2012 7:42:17 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsFAST good quality PCIe-to-USB3 adapter, but priced too high

Pros: The adapter works very well running at USB3 speeds for me, so I'm not sure what the issue is/was for the other reviewer from 1/14/12, but I've had no problem at all getting it to run as fast as expected (see ATTO Disk Benchmark Write/Read scores in Other Thoughts...).

I like the ability to provide additional power to the USB3 ports via the cards SATA power port, but you will need to buy a molex-to-sata extension (if you don't have an extra available sata power plug) or use one of your PSU's sata power plugs to utilize it. In my case, to put it into a HP 8000 Elite SFF (with limited power attachments off of the PSU) I also had to use a one-to-two sata power splitter cable to create an additional sata power connector coming off of the PSU.

Cons: Price. It is easy to set up and install, and it works very well, but, for what it is, it should be $25-$30 or less including free shipping and not $40 with $7 shipping (total $47) for that, -1 Egg. If it were $25-$30 including shipping, it would easily be a 5 Egger, and I would buy more of these and use them routinely to upgrade PC's with older technology (like the HP dc7900 or 8000 Elite series).

SIIG, NewEgg AND ShopRunner - You guys all three need to get on the ball here and get this within reach - adapter price and shipping - of regular (and irregular) Geeks who could justify routine use of this in both older (non-USB3) as well as newer (but non-USB3) tech if the price was closer to the Earth's surface. Your window of opportunity is closing the more you wait - more and more mobos and PC's coming with USB3 ports and USB3 headers...don't wait too long and miss the opportunity!

Other Thoughts: I used a Western Digital Caviar Blue SATA 3 (6 Gbps) drive with 16mb cache (the WD5000AAKX) and the StarTech USB3S2SATA SuperSpeed USB 3.0 SATA Adapter with a USB3 cable to run the test. I ran 3 configurations - ALL three configurations (1 Internal & 2 External) had in common a HP 8000 Elite SFF PC with a LGA775 mobo and the WD Caviar Blue HDD. The two EXTERNAL configurations had in common a StarTech USB3 Adapter and USB3 cable with one EXTL configuration using a USB3 port on this SIIG 2-port PCIe host adapter and the other EXTL using a USB2 port on the HP 8000 Elite SFF front panel.

ATTO Disk Benchmark Scores (I'll just give the R/W for 8192kb transfer size, but from 64kb-8192kb the scores were essentially the same):

[1] Internal HDD (sata2 @ 3 Gbps) - R=132,669 / W=129,888 mbps
[2] External via SIIG USB3 port - R=122,573 / W=87,296 mbps
[3] External via PC's USB2 port - R=34,636 / W= 30,263 mbps

Not too bad for a PCIe adapter card, I'd say, and clearly better than

2 out of 2 people found this review helpful. Did you? Yes No

  • Anonymous
  • 1/14/2012 7:35:28 AM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

1 out of 5 eggsDoesn't Work

Pros: None! doesn't work. transfer rate is 38mbps which is usb2 speed.

Cons: Replaced it twice. Downloaded the latest driver and when external drive is plugged in I get a balloon that states "This device can perform faster if you connect it to a Super-Speed USB 3.0 Port" Support was not helpfull much run around.

1 out of 1 people found this review helpful. Did you? Yes No

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Item#: 9SIA24G28M4406
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