How long should RAM last

I bought my MacPo just over 3 years ago with 8Gb RAM.
I have been having problems with the computer slowing down etc and had it checked.
It showed that only 2Gb RAM is functioning.  The boards appear to be Ok.
The RAM were moved about to different slots on both boards to find the two which were functioning.  All dust was removed and the boards reseated.
I cannot believe that 6Gb RAM would break down after such a short time.
Has anyone else had a similar problem and what should I do about it?
Regards
SAS

2009? DDR3 then. RAM fails
2006-8 used FBDIMMs that run hot, have huge RAM heat sinks and also fail.
It isn't about how long but how often they heat up and cool and could just like disk drive die in six months. RAM is not your toaster - and my coffee/espresso well I go through those a lot.

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