Why is the manufacturer of RAM 'important'?

I'm browsing the RAM upgrade threads and there are many saying things like 'this manufacturer is better than that', or 'you get what you pay for' etc. etc.
In what way does the philosophy 'you get what you pay for' map to RAM? If all the RAM chips (compatibile with a particular iMac) from the different manufacturers have exactly the same specifications then why is one better than another?
How can you tell either before you purchase or after that you have got a good or a not so good pice of memory?

Kappy wrote:
There are few manufacturers of RAM but lots of branded resellers. When you buy a particular brand of RAM you may know nothing about its manufacturer. Even the best manufacturer can produce a bad product, so buying based on manufacturer is not a guarantee of a good product.
Just a small nit-pick. There are only a handful of RAM chip manufacturers,
(and they all have excellent quality control) -- but there are hundreds of
memory module manufacturers who solder the RAM chips and a few other
components onto DIMM or SO-DIMM printed circuit boards (from various
sources). That provides limitless opportunity for variable quality.
So, as you say, it's difficult or impossible to determine quality by examining
the module -- premium components do not guarantee that the solder joints
are sound. The only reliable guide is the reputation of the supplier.
...you pay for what you get,
Looby

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