• verify running cores

cat /sys/devices/system/cpu/online 
cat /sys/devices/system/cpu/offline

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• to disable CPU1 core

echo 0 > /sys/devices/system/cpu/cpu1/online

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• to enable CPU1 core

echo 1 > /sys/devices/system/cpu/cpu1/online

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• verify memory clock speed

# watch out speed & configured clock speed
dmidecode --type 17