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#11
If you need more than 2 more USB ports, go for the USB 2 PCIe card. All of the USB 3 cards I've seen only have 2 ports, while the USB 2 cards will have 4 or 5 - (4 external & some have 1 additional internal).
I wouldn't be concerned with USB 3 until your next PC upgrade.
You should also check if you have a PCIe x1 or PCIe x16 slot.
Also check for a full height or half height bracket.