OK, so one of my new S3 machines is hashing at 402.75Gh/s. Frequency is 218.75. One of the strings (if that is the word) is showing oooooxo-. Rebooting through the web interface, or physically power cycling doesn't fix it. Reading through this thread the suggestions are
1) Downclock to 212
2) Update firmware
3) Dismantle and replace thermal compound
Which of these is most likely to fix the hashing? Is there anything else I should try?
I've noticed that you can have the odd x in the ASIC status and either switch completely off and then after a minute switch back on at the PSU and when booted up occasionally the ASIC status 'x's will have gone or sometimes they disappear after running for a few hours say 12 hours.