If you're talking Fermi, they're reference boards like all others. Very impressive and strongly worded warranty commit on their website. Looks pretty damn good IMO...
This limited lifetime warranty is valid for the life of the retail product, so long as the original purchaser owns the product, based upon the following conditions
From their warranty:
But how long is the life of the retail product, 1 year, 2 year, ...?
It is a limited lifetime warranty. If they EOL the product the warranty is over.