When dies are produced from the fab they are broken into different lots based on results from testing. This is based on the error performance. While one lot may

When dies are produced from the fab they are broken into different lots based on results from testing. This is based on the error performance. While one lot may not work as the top of the line model, it may meet the requirements for a lower power unit. Buyer beware. While you can possibly overclock your video card, you certainly run the risk of a higher number of issues.