Help to specify mask/charset/command

[artur3004]

Code:

hashcat64.exe -m 1000 -a 3 -i --increment-min 12 --increment-max 14 -a 3 hash.txt ?a?a?a?a?a?a?a?a?a?a?a?a?a?a

Code:

Integer overflow detected in keyspace of mask: ?a?a?a?a?a?a?a?a?a?a?a?a

is it because it needs so much memory?
i have 32gb ram and the rx 480 has 8 gb (whyever it only can only allocate half of it)
what specs(ram) would i need to perform this brute force?