RAM kits are now sold with one fake RAM stick alongside a real one to create a performance illusion
AI
Economics
Hardware
(www.tomshardware.com)
The tolerances are tight-enough that "paired sticks" are just sticks from the same bin.
It's a scam, unless you're overclocking, & running the things outside of their rated voltages/speeds, in which case you're gambling anyways.
It breaks people getting return-on-a-single-stick, & that may be good for the corporation, but it's bad for the customer.
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