Sorry the only info I have this replaces all previous version of the optical switch, there has been several threads on the forums with people having issues with their tb's this seems to have fixed the issues so far, its only been 4 weeks,(plus happ did several weeks of testing on these new chips) I have not heard of anymore issues ones this chip is changed, you will have 8 solder points per board. This might also prevent issues from developing in the future for owners of the older boards.
dm