So on the second attempt I have now had a working G750JS for two weeks..first had a problem with fans spinning up to full speed when not under load, but was replaced with no issue from my online retailer in the UK.
It came with an 8Gb Samsung memory module and I have added 8Gb of Kingston Hyperx(DDR3L @ 1.35v) which works fine and I have
replaced one of the two 750Gb WD black 7200 hdd withs a Kingston Hyperx SSD......I have been running an undervolt on the CPU of -50 for about a week and that all looks good too at this stage, will see if I can squeeze more out of it when I am sure it is stable. So looking forward to be part of the ROG community!