There are rumors of 2.1 cards not working in 1.0 slots. Try to buy a 2.0 card, or buy from a place with a good return policy. (just in case.)
Hmm, seems that its some MBs that dont support 2.1 in 1.0 slots yea. Some have released new BIOS to support 2.1. Havnt seen that before so now i learned something new
But then i would try to find a 2.0 card instead of 2.1.
kaushal9119: Could u link what MB u have?