@Amazeman32
The specs of your machine is
https://support.hp.com/ie-en/document/c06992456
It has 8 GB DDR4-2666 SDRAM (1 x 8 GB) now and you are saying it is Samsung M378A1G44AB0-CWE 1x8GB. The BEST option for dual channels architecture is to use SAME Samsung M378A1G44AB0-CWE 1x8GB for slot 2 or using the following compatible RAM
https://www.crucial.com/memory/ddr4/ct16g4dfd8266/ct19807677
You can also upgrade to 32GB or even 64GB using the following RAM (will run at 2666MHz)
32GB: https://www.crucial.com/memory/ddr4/blm2k16g44c19u4bl/ct19807662
64GB: https://www.crucial.com/memory/ddr4/blm2k8g51c19u4b/ct19807667
Regards.
BH***
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