What make of RAM should be in a MacPro and would they all be the same make in a new computer?

My MacPro is only just over 3 years old and 6 of the 8RAM have stopped functioning.
I put the question - how long should RAM last - and had some replies.
One of the replies led me to wonder what make of RAM should be or should I expect to be in a New MacPro.
Should they all have been the same make when new?
2 of the 6 broken RAM are hynix which I believe are used by Apple.  I don't know what the make of the 2 functioning RAM are?
The other 4 defunk RAM were made in Singapore with a logo - an oval with an M running through it. I can't find any reference to this on the web.
I am in discussion with the supplier of my Mac so any information would be of help.
8Gb of RAM should last longer than 3years.
The other downer/bad luck was that the Apple care package I bought ran out in January just a few months ago although this slowing of my computer started before then but only bad enough last week to have it checked out.
So disappointed with MacPro.  I expected better.
I am having to go back to a PC which the Mac replaced which is still functioning after 7 years so......Mac or PC??????
At this moment in time the PC is proving more reliable and much cheaper!!!!
Thanks in advance

The cpu heat sinks are not attached to the ram and this is off topic so I am not going to debate it further with you.  If you have a mac pro open it up and look inside for youself.  If you don't stop speculating.
I should add these dimms do have their own heat sinks but they are physically part of each dimm itself.

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