Summary: Adds high speed USB 3.0 and SATA 6.0 to my computer. The USB 3.0 works great with external drives and the SATA 6.0 was a real speed booster for a new hard drive. Wasn't compatible with another card in my computer but after removing it this card worked fine.
Summary: 8-22-2013 Rev. A. I have a HP-8000-Elite CMT, that has all the requirements (PCIe2.0, x4 (in a x16 slot), it works but at slow SATA1 speeds. USB-3.0 is faster than my other card that's in a PCIe1.2 x1 Slot. Called ASUS support, refused to help me in any way. I wont buy any ASUS products in the future... I plant to re try using it after my computer expert updates the BIOS. Maybe he can figure out its problems???
Summary: This is a great card on Windows 8 did not have to install any drivers for the SATA 6G Controller or for the NEC USB 3 controller. Only thing that I didn't like is that for some reason it doesn't want to get along with my two 2GB ASUS Radeon 7850's, and hardlocked on me. Update, found out it was a driver/hardware conflict between this card my 7850's on Windows 8. Ended up uninstalling Windows 8 and reinstalling Windows 7 and this card works perfect on Windows 7.
Summary: I installed this on an Asus P6T Deluxe motherboard running Windows 8 Pro x64. As suggested in another review, I left my boot drive (1 TB Hitachi SATA II)attached to the motherboard SATA II connection it was already working with, installed the U3S6 card in an unused PCIe 16 slot and started the machine. Windows 8 added the necessary drivers after one "restart due to error" hiccup.
Summary: Only for certain motherboards as per the manufacturer. I have it in my first gen i7 and have a SATA III SSD connected to it and I do notice the speed increase as my motherboard only supports SATA II. The addition of two USB3 ports as well is welcomed for transferring music, video, and other large files. These are hard to locate as companies would probably prefer you buy a who new motherboard to get these features.
Summary: Can buy cannot use, not compatible even with Asus' own P5WD2 Premium motherboard. When contacted, their technical support simply brushed it off as no-longer-supported product. Having been a 3-in-a-row Asus user over 15 years I have decided enough is enough, I will be switching to Gigabyte from now onwards.
Summary: ...but I couldn't get more than 1 hard drive to work at a time on the card. And USB 3.0 transfer rates were slightly degraded with a hard disk drive attached. But other than that small problem it has worked great. This is a common problem with USB 3.0/SATA 6 combo cards, and I have to say it wasn't as pronounced as my friends PCIe 1x combo card. Overall I am happy with the price and performance.