Let's see my RAC:

Recent average credit RAC (according to World Community Grid) 1,778.74651
Recent average credit RAC (according to BOINCstats) 1,773.88687

Think it's updated at BS every 6 hours, not sure.

The client, which I think is the only real time RAC shows 1,792.22 in the projects tab.

For the interested in seeing a bit more stats without going onto the internet, visit the BOINC client Statistics tab where both single host and project total can be seen. Further if you add e.g.

<save_stats_days>90</save_stats_days>

to the cc_config.xml file <options> section you can see more days of statistics in your client where the default is 30 days, here 90 **. Choose host total or average and tick any chart-line point and the particular date + credit earned for the day is shown. Caveat is there that it shows the credit since last contact with servers for validated work.

** Of course if you increase the number of days to save, that many days have to pass before the full history length has been build up.