Mining rigs power combined

[pdo]

is it possible for hashcat to decrypt 64 hex string provided the hashed version ? 64 chars and using 150 gpus at once (all rx3090) .. whenever i test on my pc i get integer overflow detected ..

No, you won't live long enough to break that, never mind the other technical limitations.

64 hex chars is 16^64 possible combinations, which is about 1.157 x 10^77 combinations. That's very close to the estimated number of atoms in the observable universe.

The reason you get integer overflow from hashcat is because hashcat will only handle up to 2^64 combinations in a mask attack.