USB card 4 port vs MB 2 port listed in manual

[new2]

My husband bought a USB card that has 4 ports. The motherboard manual for the machine I build indicates that it supports 2 USB ports. Since the unopened box is past the 14 day return, can this card be used? If tried, would/could it cause a problem?
SIS530 MB
ATI all in wonder
on board sound
64 mb memory
win98 SE
linksys network card
zoltrix modem

Thanks

[daveleau]

It should work fine. It sounds like the card may have a built in hub. Check the manual to see what the bandwith of the card is. The regular on board USB has 12 MB bandwith. Normal add-in cards have the same. If this card has some sort of built in hub (not familiar witht his type of card) and only has a 12MB bandwith, then some devices may not work properly. I only say this b/c my USB TV device does not work properly on a USB hub. Any add-in card will add to your bandwith. It should work fine though. Your mobo will support more than 2 ports. My mobo says it supports two but it is talking about ports connected directly to the mobo, not including hubs or addin cards. Hope this helps.
Dave