As far as i know Samsung & Nec are the worlds leaders in chip manufacturing and technology so they practically supply to brands all over the world.
I dont know specifically about ram but in any product there are always a lot of components which go into the manufacturing/assembling of a final product hence the difference.
They might be good at that one chip but not the complete thing. Since they might not consider it their core business so they might not even consider doing any R & D on it.
Just like in graphics cards we have a nvidia 6800 gpu which will be available in 10 different brands but still we say this is better or that which is mainly because how they integrate their various components into working as one.
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