If you get an OEM Creative soundcard, be careful cos in the past OEM drivers for the cards can be an arse. If it comes with a CD, keep it safe.
Some OEM Creative cards were/are used in brand name machines like HP, I dont think the Creative website supports OEM drivers, just retail ones.
So for example, an OEM Creative card you buy without a CD or if you lose it, chances are you 'could' get working drivers off of HP's website.
I had this with an OEM card, it was basically an X-fi Music card but drivers from the creative website gave me BSOD. I 'had' to use the drivers from the CD that came with it.