Hashcat speed benchmark vs recovery

[LittleKita]

Hi,

i have a Nvidia TITAN Xp.

I did various tests with md5 to compare speeds.

Code:

hashcat --benchmark -D 2 -m 0 -d 2

Speed.#2.........: 39199.0 MH/s (50.93ms) @ Accel:64 Loops:1024 Thr:1024 Vec:8

# 1 hash
hashcat -D 2 -d 2 -O --status --status-timer=1 --potfile-disable --markov-disable --restore-disable -m 0 -a 3 9dc5f758e8e773980f07a95bfc8642f1 "?a?a?a?a?a?a"
Speed.#2.........: 34478.8 MH/s (6.43ms) @ Accel:32 Loops:256 Thr:1024 Vec:8

# 32 hash
hashcat -D 2 -d 2 -O --status --status-timer=1 --potfile-disable --markov-disable --restore-disable -m 0 -a 3 hashlists/32.hash "?a?a?a?a?a?a"
Speed.#2.........: 21318.8 MH/s (10.91ms) @ Accel:32 Loops:256 Thr:1024 Vec:8

# 1k hash
hashcat -D 2 -d 2 -O --status --status-timer=1 --potfile-disable --markov-disable --restore-disable -m 0 -a 3 hashlists/1k.hash "?a?a?a?a?a?a"
Speed.#2.........: 21358.2 MH/s (10.96ms) @ Accel:32 Loops:256 Thr:1024 Vec:8

# 1m hash
hashcat -D 2 -d 2 -O --status --status-timer=1 --potfile-disable --markov-disable --restore-disable -m 0 -a 3 hashlists/1m.hash "?a?a?a?a?a?a"
Speed.#2.........: 15239.9 MH/s (7.67ms) @ Accel:64 Loops:64 Thr:1024 Vec:8

Edit: change "-d 1" to "-d 2".

Why are the numbers so different from the benchmark?
Have I possibly used the wrong parameters?
Or is it the host system?

Regards,
  LittleKita