The score is calculated from the measured speed (Ms/s or mega samples per second), relative to the speed we measured for a GTX 980. The ratio is weighted by the approximate usage of the various kernels and then added up. If your score is under 100, your GPU is slower than the GTX 980 we used as reference, and if it's more your GPU is faster. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.