Apparently NVIDIA has a ton of G98 chips on hand and couldn't figure out what to do with them since they've angered people by rebranding old chips too much.
Since they can't rebrand it, they figured they would just sell it as is. The keychain is comprised of a G98 GPU that is encased in a 1.5" square of clear lucite with a key ring attached. You can buy these directly from the NVIDIA store for $9.99.
If you want a piece of NVIDIA technology, NVIDIA's chip keychain is your answer. With a genuine NVIDIA G98 chip inside a 1.5" square clear lucite key tag you not only get a real GPU, but also a key chain. The G98 chip comes complete with an engraved NVIDIA logo.