Current race: GCW Sieve, April 7-22 (12:00 UTC) Welcome to another year of PrimeGrid races! Here's the (tentative) list of all races for this year: What you need: One or more fast x86 processors. (Even slow ones might do!) Windows (Vista or later 64-bit, or XP or later 32-bit), Linux, or MacOS 10.4+. BOINC, attached to PrimeGrid (http://www.primegrid.com/). Your PrimeGrid Preferences with only the above project(s) selected in the Projects section. What may help LLR (the central 6 races): An Intel Sandy Bridge or later ("Core series" other than first-generation) processor with AVX may be 20-70% faster than with the default application. Sadly, that does not include Pentium or Celeron processors, or AMD processors. Turning off hyper-threading. It really does help, even more than just doing half as much work as you have virtual cores. Faster RAM might help on many races, as long as it's stable. In certain races, usually those with longer WUs, it may help to enable multi-core processing with app_config.xml. Juggling in some extra WUs may help in all races. What may help in other races: A GPU helps in the last two races. Turning on hyper-threading may help. A 64-bit OS may help. What won't help (but won't hurt either): A large amount of RAM. Any Android devices. What won't help (and will hurt, sort of): Unstable processors. (Invalid work will be deducted! If Prime95 worked recently on your processor, it should be stable.) Work not downloaded and uploaded within the challenge. (It's not counted.) Should you not be able to be in front of one or more computers at that time, there are several options: You can often set BOINC's network connection preferences to wait until a minute or two after race time. And for short work units, you can just set the queue level very low (0.01 days). This also makes it more likely that you will be a prime finder rather than a double-checker. But you might want to raise their queue size after the challenge is underway. Welcome and good luck to all! P.S. If no one has posted stats lately, try tracking your stats with my user script. With that installed, visit the current race's Team stats link for TeAm stats.