Is it common for a reputable laptop reseller, in this case PC Specialist UK to install 2 different Ram makers?
I never experienced a problem, but Memtest 86+ found a lot of errors, and it failed the test.
Monitoring Windows 10 Event Viewer and running Windows Memory Diagnostics test
Although I appreciate that TestMem86 runs more vigorous test and found errors dew to conflicting memory modules
I will take no action as I don't think that to my needs it's going to be a problem.
However, next time that I buy a laptop from PC Specialist UK or any other company, I will make sure that the memory they install is compatible with Memtest86. Thank you all for looking.