unbuffered ecc ram
unbuffered ecc ram
These should function well on mobile devices without ECC support, though the ECC component might not work. It's best to verify compatibility on systems that don't support ECC. The main concern is DDR2 RAM with 2GB, which could be cheaper and still meet a minimum of around 1000MHz due to microns.
They're actually checking if it's a registered ECC or not. Most unregistered ones usually have an additional RAM chip, but no ECC chip in the center.