Summary: Yes, as others have noted, the packaging makes no mention that this card is Mac compatible, but it fired right up and works just fine except for the sleep issue. Running 10.6.8 the card disconnects from the external drives when the computer drive goes to sleep giving an improper disconnect alert. This solution works for me: sleep the monitor only. This saves some power but keeps the externals alive. Update: Down-grading to three star.
Summary: I purchased a new PC in 12/11 with Windows 7 Pro 64 bit and realized to late that I did not order enough USB ports for all of my peripherals. I installed this card and it seemed to be okay. However, when I powered down I got a blue screen. I had to pull the plug to turn off the machine. I removed the card and restarted the PC then powered down normally and on again. My PC is healthy - just did not like this card.
Summary: Easy installation. Plug and Play and it just "works" We all know we are limited to the Mac Pro's 5 port USB, this will expand it to a total of 9! I use these extra ports for my keyboard and external hard drives. With my tests, I haven't found them to be slower than the stock usb ports.
Summary: These cards are the solution to my USB problems. I am running Windows 7 on a computer I bought in August 2009, and have had problems getting hard drives and my scanner to run from various powered external USB hubs. I bought 2 PCI express USB 2.0 cards, put them in, and all my powered external devices, including my scanner, printers, and hard drives run perfectly.
Summary: After purchasing several other usb cards that say mac compatible and being told by employees that they would work, I finally found this one that was actually compatible with my mac. Manufacturers need to state what models a device will work with if it doesn't work with all models.
Summary: I recently bought a new Dell Studio XPS 9000 system. All the bells and whistles that I needed except I had to have 4 more USB ports in the back so I could connect my (4) Maxtor external drives. When I was ordering my system the Dell sales rep suggest the PCI420USB 5-Port USB 2.0 PCI-Express Card from StarTech. This was a mistake. The card was identified when I started my system but none of my external drives would load.
Installation a Success in New HP Computer with Windows 7, 64 bit, 4 core OS
David O. Kubiatowicz, Amazon
27 July 2010
Summary: I recently purchased a new "HP Pavilion P6000 Series" (p6597c) with Windows 7 (Home Premium 64 bit, Quad Core) installed and sporting a 1 terabyte hard drive with 6 gigabytes of system memory. The tower has 4 USB (2.0) ports in back and 2 USB (2.0) ports in front for a total of 6. But, from past experience I always needed more USB ports than those supplied.
Summary: I bought this after twice being assured that regular PCi USB boards would work in my Powermac G5. They did not. I bought this, plugged it into the slot and it works fine. No mess, no fuss. Hardest part of the installation is getting it out of the packaging. It does not come with anti static wrapping so it either does not need it or I was lucky. If you buy the cheaper PCI USB card it won't fit into your mother board.