Didn't see any warranty info on the package or on the little piece of paper with "installation instructions" inside.
The RAM performs as expected of any generic RAM on my second AMD XP1800 system with a Gigabyte motherboard. I don't know about its O/C capabilities (not O/Cing my second XP1800 for now), but it runs fine on default settings (2.5CAS, 133mhz CPU bus).