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Thread: Why is my CPU faster than GPU at cracking?

  1. #1
    Join Date
    2015-Oct
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    United States
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    18

    Why is my CPU faster than GPU at cracking?

    I am using hashcat/cudahashcat with a WPA2 handshake.
    My CPU is an i7 and the GPU is a Nvidia with Cuda.

    The results of running for a few minutes are:
    My CPU reports
    (Speed/sec.: - plains, 2.7k words)
    (Estimated time: 2 days)

    My GPU reports:
    (Speed.GPU.#1...: 12000 H/s)
    (Estimated time: 10.5 days)

    Why is my CPU so much faster than my GPU at cracking WPA2?
    Last edited by Tritium; 2016-03-01 at 01:11. Reason: formatting

  2. #2
    Join Date
    2015-Mar
    Posts
    141
    You are going to have to give a lot more information than that for an answer, such as:
    Dictionary size, Processor, command ran, etc...

    Also...

    cpu hashcat displays different speeds than ocl/cudahashcat, so you're not even talking apples and apples here.
    With 200 unique salts you're looking at 2.3 million words per second for plus, versus 0.46 words per second for cpu.
    2.3 MH/s * 200 unique salts would be 460 million plains per second.

  3. #3
    Join Date
    2015-Oct
    Location
    United States
    Posts
    18
    Quote Originally Posted by aanarchyy View Post
    You are going to have to give a lot more information than that for an answer, such as:
    Dictionary size, Processor, command ran, etc...

    Also...

    cpu hashcat displays different speeds than ocl/cudahashcat, so you're not even talking apples and apples here.
    With 200 unique salts you're looking at 2.3 million words per second for plus, versus 0.46 words per second for cpu.
    2.3 MH/s * 200 unique salts would be 460 million plains per second.
    Thank you.
    For some reason I think it's just the estimation time is off.
    I did a CPU for a while (say 30 minutes) then paused it. Ran GPU for about 15 minutes and it basically blew past my CPU percentage in less time.
    Still have to wonder why my GPU time says 10 days and my CPU says 2 days when my GPU made it through more % faster than my CPU.

    I think you nailed it by saying I'm comparing two complete different things.

    In case it's still relevant
    Using: --hash-type 2500 --attack-mode 3 --custom-charset1 ?d handshake.hccap ?1?1?1?1?1?1?1?1?1?1
    For a total of 10,000,000,000 combinations of 0-9 and 10 characters.
    If I understand "salts" correctly, I only am attacking 1 AP/Handshake/Salt
    Using an intel i7 CPU.

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