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SQL CPU affinity and unchecking instances from using it, what is the result?

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Hi, Our SQL DBA has configured CPU affinity for two instances out of four. What is the resulting CPU available to the unchecked instances? If the the server has 32 cores and the first two instances have been configure to use 4 cores each there would be 24 cores left without infinity set. Would the two remaining instance only get to use 24 or all CPU's?

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