DDR RAM memory training
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On a new computer build, it can take a few minutes to boot a system the first time.
When a new CPU is paired with a new set of DDR RAM, the CPU may take the time to test, or "train", the RAM.
The training is between the DDR controller (which on every consumer system from the last decade has been integrated into the CPU package) and the DDR devices (on the DIMMs you slot into your motherboard). The training determines the optimal configuration for speed and stability.
There may be a enable/disable memory training in the BIOS settings.