The Performance Tuning Protection Plan being offered by Intel is a chance for you to experiment with the overclocking features of your processor without the worries of what will happen if you push the procesor too far. The Plan allows you a single processor replacement, hassle-free, from our customer support. This is in addtion to your standard 3 year warranty. In other words, if it fails under normal usage, we will replace it under the standard warranty; if it fails while running outside of Intel’s specifications, we will replace it under the Performance Tuning Protection Plan.
via Tuning Plan.