Although Toshiba mention 8GB models of the NB10 in some marketing material, there don’t seem to be any readily-available 8GB examples in the UK.
I’ve confirmed this evening that the NB10 can be upgraded from the standard 4GB to 8GB by replacing the single 4GB SODIMM under the hatch on the underside with an 8GB one.
Toshiba have an excellent clear video about the procedure at https://www.youtube.com/watch?v=ZPbCqMZpydw – it’s very simple. Note that (as with disk replacement), the system is not truly powered down unless the battery is removed, and this must be done before the RAM is removed.
No adjustments to the BIOS are necessary and there are no errors – the system just boots up as normal.
The system ships with a 4GB DDR3L-1600 (PC12800) SODIMM. I replaced this with an 8GB unit (it’s a straight swap with my 2012 Mac Mini).
Interestingly, dmidecode on the Toshiba reports it as 1066MHz unit – although it is definitely a 1600MHz unit and is labelled as such and works at 1600MHz in my Mac. I’m not sure why this happens.
8GB is the maximum RAM supported by the Intel Bay Trail-M platform upon which the NB10 is based.
A reader reported trouble with adding an 8GB DIMM. Here are some photos of my setup. I haven’t altered anything about this since March 2014 and (tempting fate here…) have had no trouble.