Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Is this compatible with Windows 8.1 Pro x64? I am looking to turn some unused PCI slots into extra USB ports for "older" peripherials.
Document: I have been looking for a USB PCI card that is compatible for windows 7. I upgraded my OS to windows 7 and the one that was installed on my computer wasn't compatible. I was hesitated at first because of the price. I did get one and installed it in less than 1 minute! Driver automatically installed. Awesome item and definitely worth the price!
it was easy to install and is compatible with my windows 7. My computer is soo old that it only had 1.0 usb slots and i need 2.0 usb slots to use windows ready boost. this product was easy to install in one of my unused pci slots. everything works great and i now have 2.0 usb slots on my computer
I bought this for an older Gateway system running Win98SE with three on-board USB 1.1 ports to add USB 2.0 for faster access to a 500gb external HD and flash drives. The computer only had one PCI slot unused, so I started by just using that one. Unfortunately, the BIOS does not allow you to configure what IRQs are used for each device, and this card uses three IRQs.
love it shipping was fast as promised, compatible with windows 8.1 (software included) but no software needed to installed it plug and play :-) very happy with the product...
I purchased this for my Grandma's computer (a Dell Dimension desktop) because her new mp3 player wasn't working very well with the older USB 1 ports. She was planning on getting a new computer, but I convinced her to try this and some extra ram first, and it works great! Very easy to (physically) install, and XP did the rest- no drivers to download, no software to run- simple!
simple install, mounting was easy. USB all worked on first Windows 8.1 boot - no driver installs or reboot needed.Did not test speed, but all ports were working fine when I installed it!
I just installed this PCI card on my new Lenovo H405. The desktop has 4 USB ports in the back and 2 in the front, which is not quite enough for all of my devices. Windows 7 recognized the PCI card and installed the appropriate drivers. It then prompted me for a restart, which I did, and then I was all set. It seems to me that this product should be marked as Windows 7 compatible.
I purchased this PCI card to provide USB 2.0 connections for an 8 1/2 year old Dell Dimension 4300S PC. It installed easily. The Drivers were already present on my Dimension so I didn't have to use the minidisk that came with the card, but it did take a few minutes for my old old computer to find and install the drivers. Seems to provide rapid trnsfer of data from the hard drive to external disk drives that are connected through this PCI card.
So, I was looking around for USB hubs... came across this. This is fabulous. I stick it in, it works. No installation, no hassle. Windows 7 recognized it in a snap.There's a few reviews that complain about ancient computers and lacking the ability to physically install it or having outdated OS's. If you don't know if your motherboard has a PCI slot, then you probably shouldn't be buying something that goes into a PCI slot.
VIA VT6212L Chipset USB 2.0 PCI card - see my user attached images at the top of item page. Retail box. Plug and Play. No drivers needed for Vista, XP, 2003, and 2000. A driver CD is included for Linux, MAC OS, Windows 98, and ME. Driver version 2.70P may also be downloaded from VIA here:[...]I have XP Pro SP3, I plugged it in, booted up, and it was detected and installed automatically.
Answer: it's going to need a driver for win8.0 or 8.1, otherwise any devices u plug in won't be recognized until after windows completes boot process. for example, kb and mouse are checked during post process which is before windows loads.Win 7 comes with the correct driver, so I would believe ver 8 and 8.1 do also. But, you haven't anything to lose....buy it and if you are unhappy, return it. I did that to get a usb3 external ports...good luck