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If you think about it, many modern CPUs have as much cache as XTs had RAM. It's no surprise that a I7 can work perfectly with no DIMMs attached to it and actually for a brief period of time, the BIOS does exactly that until it starts the DDR memory.

Another interesting thing, no matter how many cores the CPU have, it always starts in single-core mode and you have to switch the other cores on.

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