Total Credit
Credits are tracked internally for computers, users, and teams. When a computer processes and returns a work unit it receives no credit. It must first have that work unit validated by the project specific method. Once validated the computer is granted credit, which can be less than, equal to, or greater than what was requested. This amount is immediately added to the computer, user, and team total. If a work unit is returned past the given deadline or is found to be inaccurate it is marked as invalid and zero credits will be granted. Users and teams commonly determine world rank by comparing the total number of credits accumulated. This highly favors users and teams that have been around for the longest time and makes it extremely difficult for new users to rapidly gain ground in the rankings even if they are running many computers. That being said, given the exponential increase in computing power of the average PC, it is relatively easy to surpass inactive BOINC users, who have earned all of their points on obsolete machines—even if they were at one time ranked highly. Thus, on average, the highest ranked BOINC users will be the ones who are actively crunching.
Read more about this topic: BOINC Credit System
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