beware of ETRON USB 3.0 chip on motherboards...
925186
I bought 4 of this SIIG usb 3.0 hub with card reader and none worked with my gigabyte GA-Z68MX-UD2H-B3 !!

I tried different models and brands of USB 3.0 external hard drives and USB 3.0 flash drives so I came to the conclusion the problem could lie with the motherboard's USB 3.0 controller. A quick search on the web returned a whole bunch of users wish similar stability problems. Turns out the latest motherboard manufacturers are all using the cheaper "ETRON J168 USB 3.0 Controller" on their motherboards, which has known bug with many USB 3.0 devices (including this SIIG hub which uses JMICRON USB 3.0 controller).

This SIIG usb 3 hub is an excellent product, don't be discouraged if yours do not work because there is a good chance the problem is caused by inmature usb 3.0 controller on the motherboard, namely ETRON.

If your SIIG USB 3.0 HUB WITH CARD READER does not work you might want to check if your motherboard uses the buggy etron usb 3 chip. As of this writing, etron released driver update version 1.05 but it is still very unstable. I have many usb 3 products such as Partiot USB 3 flash drive, SIIG usb 3 hub, Eagle Tech USB 3 external hard drives and NONE work reliablly with my motherboard's etron usb 3 chip.

I have since purchased a usb 3.0 add on card based on NEC/RENESSA chip and works perfectly fine with this SIIG hub(high transfer speed and all my usb 3 products are detected right away).

I hope you all amazonians will find this review useful and let more buyers know about this problem. Hopefully either ETRON or JMICRON will come out with a fix that allow their products to be compatible but as of 2/7/2012 they are just not playing nice with each other. Your solution is to get NEC USB 3.0 controller add-on card, and this SIIG hub will work perfectly.

I did not take any stars out because this is a known compatibility issue with many motherboard's ETRON chip. Not SIIG's.
572564
Built two computers with these A78M-E35 boards coupled with A8-5500 chips and a few days later returned them for refund because there was no way to Enable usb wake from sleep and some weird system crash issue while in sleep mode.

The manual says to remove jumpers on JUSB_PW1&2 to enable USB-Wake. On both systems this only created an un-bootable environment where there is a black screen and the number 99 on the bottom right side. I updated the BIOS to the latest version and still same 99 BlackSOD issue. Tried all different configurations. Nothing. Bummed. These computers were for my clients who will rely on usb wake all the time.

Also, one of the computers would completely crash into a weird comatose-sleep while trying to wake from sleep. The only way to make the computer turn on was to unplug it from the wall for a few seconds and then turn back on again, where it would resume its awaking process. Weird and Glitchy. These are funky motherboards. I'd stay away from this one if I were you. Bugs galore. Trust me. Find something similar but just not this board.
4263755
Front USB ports are not compatible with ASUS AM1I-A Mini ITX motherboard, there is nowhere to plug them into the board.
4724464
Doesn't work with USB 3.0, as other reviewers said.

As far as I'm concerned, that's fraud.  USB 3.0 is posted all over this item.
3087925
I've never been more disappointed nor befuddled by an expansion card. Installed into a pci-e slot on an HP s5747c Pavilion Slimline running Windows 10 (Creators Update) to try to get USB 3.0 speed. Have tried included drivers, Windows drivers, bought the internal cables to get wired power to the card, and here's what I get: USB 2.0 devices work fine on it. My USB 3.0 devices only work on the computer's other six USB 2.0 ports. No USB 3.0 devices on these USB 3.0 ports, just enough recognition for Windows and Clonezilla to error out and Device Manager to show that drivers for the card are there but never showing any USB 3.0 devices plugged into it. Next step for me is to return the card or toss it, have already spent several hours researching and trying many possible solutions.
1710428
Out of the box my Ethernet wasn't working on my Motherboard. Lights turn on, but no internet connection is established. I ended up buying a $30 USB to Ethernet Adapter rather then going through the trouble and time of replacing my newly installed Motherboard. ='(
3311377
Now mind you this coming from a Gigabyte loyalist, for better lack of words, it's just that (in general) every other board MFR has given out, been DOA or been more trouble than they were worth. I am utterly surprised that 2 of 4 boards ordered had bad memory banks, the first with one, another with 2 or 3.  I would never buy from another board MFG, but in addition to the memory issues these boards are more temperamental than I have used to, since the days of those other board MFG. The other H97's are very sensitive with memory compatibility, even 2 nearly identical sets of RAM.
Also, all 3) Z97's burned-in without any issues, never had any with my z87, or z77
1892075
I mistakenly bought a motherboard with only a USB-C/TB3 connector.  That's fine, but my only TB peripheral, a MOTU 1248 is TB2.  I couldn't find any other way to get it connected.  After connecting, I was disheartened to find that the device was not detected.  However, I only had to remove the USB cable that was also connected to the MOTU, and finally it was almost immediately found.  I was prompted whether or not to trust the device and set it to always approve - done!  This is all on Windows 10 Pro, by the way.
4473494
I am writing this review simply as a warning to owners of Lenovo laptops.  Lenovo disallows installation of NICs that that not on their white-list - which this card is not.  Installation of this nic will result in BIOS startup error 1802 which notifies you of the unsupported NIC and requires that you shutdown and uninstall the NIC.  This issue, which is not specific to this product,  is well documented on the internet.
2958159
I bought this motherboard to build a virtual lab, basically to install an Hypervisor onto it. It works fine with ESXi 5.0, 5.1, and 5.5 (with injected drivers) BUT it the network card doesn't work on ESXi. They use a Realtek RT8168/8169 chip that doesn't work with the native RT driver that comes with ESXi, so I had to use the PCIe to put an extra network card which I was planning to use for extra SATA adapter. Overall is a good motherboard, I just wish they use another chip on the network card.
2524762
I purchased this motherboard in January, and it has performed for the most part, flawlessly.  The reason I'm giving this a terrible review is that the rear USB ports have never fully functioned.  When I first built the PC, I plugged an external hard drive into one of the rear ports, but it didn't work. I moved it to another rear port and it worked fine.  I didn't think about it again for 4 months, until all the rear USB ports failed.  Now, I have a PC with 4 USB items I want plugged in, but only 2 available on the front of the chassis and 6 dead ones at the rear.  After doing some more research, I have found that this is not an uncommon issue.  From what I read online, Gigabyte's tech support has been terrible.
I would advise against purchasing this motherboard.
2512481
I would not recommend this product since I am only able to use one of the two usb 3.0 ports, even after I install the new drivers. Also you have to be really careful when unplugging a device from it, because the entire card comes out with it.
638207
I bought two GA-Z77X-UD4H in the past 2 months.

The first board was quite stable, and the system was fast, until two of the rear USB 3.0 ports started connecting and disconnecting every second.

The PCI-E bases are anchored using small plastic pins. Although I released the lock at the end of the base to pull the video card out, the base easily came off with it. Suddenly I saw a forest of silver pins.

Unfortunately, the first board was out of Amazon's one month return/replacement period. I have to send it to Gigabyte for repair. Unlike most other manufacturers, Gigabyte doesn't even pay for the return shipping out of their service center.

I ordered the same board again, assuming the problem was isolated, and didn't really want to reinstall Windows. However, that was proved to be a mistake. The second board is even more troublesome. Some of the rear USB 3.0 ports are not on during POST. I can't pin point the ports, because it depends on the devices attached. I initially plugged the keyboard and mouse in different sets of ports. Only the keyboard worked during POST, but not the mouse. I saw the keyboard and mouse sticker on the motherboard, and thought that I was supposed to plug them there. After I made the switch, both of them just stopped working until Windows 8 splash screen shows up.

I also connected the USB ports from Dell UltraSharp U2312HM monitor to it. While the first board didn't give me any problem with the monitor, I had to try every single port to find one that works. However, if I switch other devices around, the port would stop working again.

I have given up my hope on this board, and ordered an Asus Sabertooth Z77.
265418
Update:  6/25/2014
The 5th motherboard just crapped out.  Code 55.  Memory controller won't run memory at any speed beyond 800mhz.  Another common problem with this mobo.  I contacted Amazon and it's now heading back to their stockpile.  I now give up on this piece of junk.

Update:  4/30/2014
After receiving my 4th, yes, 4th motherboard, I found that it too is defective.  The raid controller is failing (unable to recognize the array until rebooting again) and sometimes when I save settings in the BIOS and exit, it reboots and re-enters the BIOS even though I didn't hit the Delete key.  The onboard sound is randomly making a popping noise (of course I have the latest drivers!),..additionally, I tested using windows generic sound drivers.  Turns out, the sound popping issue is common with this board.  I also noticed that on this specific board I can't reach the 4500mhz that I could so easily achieve on the previous 3 boards.  I have already set up a RMA and I am now ordering a 5th board.  I am absolutely convinced that ASUS is playing the numbers game by pushing anything out the door and accepting the cost of increased returns.  I have bought boards from ASUS since their formation and over time have noticed a steady decline in quality control.  Fortunately, Amazon is eating the cost to ship these boards back and forth and ASUS is going to be hit with these costs once Amazon passes the charges on to them (which you can be sure they will).  On an up note...their bios 1402 allows you to now disable HPET which greatly reduces latency in some games.

Update:  4/24/2014
I decided to keep trying to get a motherboard that didn't have the BIOS clock problem.  Well, I'm on my 3rd motherboard and guess what.., the clock froze up.  Each motherboard I've received had a different bios so that's not the problem.  I've up and downgraded the bios, flashed the ME to no avail, the problem keeps reoccurring.  I'm thinking this is a hardware bug that ASUS is unable to fix via a BIOS upgrade.  I should also note that the USB ports on this 3rd board are buggy.  Devices are not being detected properly or dropped while in use...I discovered that too, is a common problem with these Hero boards.  I'm waiting for my 4th mobo and sending this 3rd one back.

You can read all about this bug on the ASUS website link that I posted in the "comments" section...

I have reduced this review to a single star because it appears there is a batch of motherboards that are flowing out of ASUS that are unable to keep time in the BIOS.  ASUS has become non responsive in this other than to keep suggesting a RTC reset (via jumper) which only starts the clock up but doesn't prevent it from freezing up again days later.  It's starting to look like a hardware (component?) problem that exists on the ROG boards.

I have to say that I like the HERO design but, I've yet to get a single mobo from them that wasn't defective.  I keep giving them "second chances" for some reason hoping that I'll eventually get something worth keeping.  If ASUS wants me to be their quality control officer, that's fine, I'll keep weeding out these defective ones for them.

Sorry ASUS, you have great designs yet the worst quality control, the worst customer service and only average components on your mobos.
1033477
Short between +12v and rx pin fried some portion of the arduino usb chip. From research it seems the arduino is now ruined.
3660000
I purchased this unit specifically because it uses the motherboard USB3.0 headers, since my case is a little old and doesn't have front-mounted USB3.0 ports. I've only tested the SD card reader and USB3.0 port, but they seem to perform very well. I also haven't noticed any significant speed difference between this USB3.0 port and the back motherboard ports, which is nice. Using CrystalDiskMark 3.0.2f and a 1TB WD Elements WDBPCK0010BBK-NESN drive with 5 passes at 1000MB, I get 106.8 MB/s sequential read, 106.0 MB/s sequential write, 37.03 MB/s random read 512kb, and 47.12 MB/s random write 512kb using the this USB3.0 port, and 106.8 MB/s sequential read, 106.3 MB/s sequential write, 38.84 MB/s random read 512kb, and 56.61 MB/s random write 512kb using the motherboard USB3.0. I believe the controller on this reader is the Realtek RTS5308, but don't know for sure.

The only thing that's a little annoying is that empty drives for each of the slots still show up in Windows even if nothing is plugged in, but that's more of a Windows bug between the options "Show hidden files, folders, and drives" and "Hide empty drives in the Computer folder."
4813122
Unfortunately the USB port doesn't work, except for supplying power, on the board I received.  I've tried multiple cables, ports, Windows Versions, and manually downloading the drivers for the NodeMCU v1 chips, but nothing would let the device be recognized.

Thankfully I had the SparkFun FTDI USB board so I could still use the device, and could manually flash it. It's just a shame it couldn't be used as theDevkit. I would have rather saved my money and bought a bundle of regular ESPboard8266

Edit: HiLetGo responded to my review, and has made everything right. They refunded my purchase, and I re-bought the same HiLetGo product, and was able to use the USB port without an issue, and everything is working as expected.