sp_configure is showing the raw bitmap value based on the CPU numbers, they are as follows
exec sp_configure 'affinity mask'
CPU number 7 6 5 4 3 2 1 0
Bit map 128 64 32 16 8 4 2 1
So, CPU 2 and 3 equate to 8 + 4 = 12
CPU 2, 5 and 7 equate to 128 + 32 + 4 = 164
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