weird memory

[josephCars]

So, I have an HP Pavilion x360 with 12GB RAM. I opened it up this evening, and discovered an 8Gb chip and a 4Gb chip, but when I run the part numbers they come back as one being a 4Gb DDR4-3200 and the other 4Gb DDR4- 2666... I had already closed it up and turned it on, and windows does say it's running 12 Gb RAM. So 2 questions.... first, would the memory even run properly if they truly have miss matched speeds? Secondly, with the max being 16Gb for the system if the one really is 8Gb I'm guessing I can just put a second 8Gb chip in place of the 4 and call it a day, or would 2 new fully matched chips be a better option?

[NonSequitur777]

@josephCars,

Welcome to our HP User Forum!

Indeed, it would be better to have identical RAM installed -same brand, model and capacity.

In other words, you would likely benefit to swap the 4GB RAM stick with an identical 8GB RAM stick.

Kind Regards,

NonSequitur777