As this was quite a lengthy thread I thought i'd just post here the resolution; on saturday me and jack spoke for an hour or so trying to replicate what the repair guys did, with getting the whole 8gb of RAM detected at 2133mhz, we couldn't. We agreed it would probably be best to cut our losses and change my RAM to lower frequency RAM.
I chose to get 16gb of 1600 mhz ram with a rebate instead, which I now recieved wednesday. Installed when I got home about 17.30 yesterday and gamed all night, all 16gb detected. No issues so far! Huzzah
No idea what was wrong with the 8gb 2133mhz ram or how the repair guys got it working, but ah well.
I chose to get 16gb of 1600 mhz ram with a rebate instead, which I now recieved wednesday. Installed when I got home about 17.30 yesterday and gamed all night, all 16gb detected. No issues so far! Huzzah
No idea what was wrong with the 8gb 2133mhz ram or how the repair guys got it working, but ah well.