You don't use the same devices :
--benchmark -D 2 -m 0 -d 2
# 1 hash
hashcat -D 2 -d 1
And obviously, the more hashes you give, the less speed you get. Benchmark is done with 1 hash.
--benchmark -D 2 -m 0 -d 2
# 1 hash
hashcat -D 2 -d 1
And obviously, the more hashes you give, the less speed you get. Benchmark is done with 1 hash.