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GPU slower than CPU? - Printable Version

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GPU slower than CPU? - Konvict - 08-24-2012

I recently 'installed' a GPU I was given by my dad, its an 'nVidia GeForce GTS 240'
I spent the day setting it up, then to realize that a dictionary attack with oclhashcat-plus was 10 minutes, while a dictionary attack with original hashcat took apporx: 5 minutes.
Why could this be, is it just plain and simple that my GPU specs aren't good enough or could there be something im missing here?

Thanks for your help, I can give you more information if needed.

RE: GPU slower than CPU? - Mem5 - 08-24-2012

Your card is damn slow ! 112 cores @ 675 Mhz
Buy a new one Wink

Please paste your command line and and the output, and your driver version.

RE: GPU slower than CPU? - Konvict - 08-24-2012

How do i get my driver versions, aalhough I know I nstalled the latest version of forceware, just a few days ago.
./cudaHashcat-plus32.bin -m 0 -a 0 example0.hash ../wordlists/
cudaHashcat-plus v0.08 by atom starting...

Hashes: 6494
Unique digests: 6494
Bitmaps: 16 bits, 65536 entries, 0x0000ffff mask, 262144 bytes
Rules: 1
GPU-Loops: 128
GPU-Accel: 8
Password lengths range: 1 - 15
Platform: NVidia compatible platform found
Watchdog: Temperature limit set to 90c
Device #1: GeForce GTS 240, 1023MB, 1620Mhz, 14MCU
Device #1: Allocating 16MB host-memory
Device #1: Kernel ./kernels/4318/m0000_a0.sm_11.32.cubin

Scanned dictionary ../wordlists/konvict.bl: 5948141858 bytes, 511711678 words, 511711678 keyspace, starting attack...
info from a few minutes in:
Status.......: Running
Input.Mode...: File (../wordlists/konvict.bl)
Hash.Target..: File (example0.hash)
Hash.Type....: MD5
Time.Running.: 2 mins, 58 secs
Time.Left....: 4 mins, 7 secs
Time.Util....: 178178.8ms/143053.0ms Real/CPU, 407.3% idle
Speed........:  1182.3k c/s Real, 57344.0k c/s GPU
Recovered....: 2509/6494 Digests, 0/1 Salts
Progress.....: 219331537/511711678 (42.86%)
Rejected.....: 8678353/219331537 (3.96%)
HW.Monitor.#1:  0% GPU, 59c Temp

RE: GPU slower than CPU? - blandyuk - 08-24-2012

Run a brute-force attack on those hashes instead, oclhc-plus might be just slow with your wordlist:

./cudaHashcat-plus32.bin -m 0 -a 3 -1 ?d?l?u example0.hash ?1?1?1?1?1?1?1

Post you results.

RE: GPU slower than CPU? - atom - 08-24-2012

Either do what blandy said or add rules. oclHashcat-plus needs an amplifier on fast hashes to run efficient.

RE: GPU slower than CPU? - Konvict - 08-24-2012

you want me to let it run for the full time, or just give you what its done so far?

Status I took after 40 mins
Status.......: Running
Input.Mode...: Mask (?1?1?1?1?1?1?1)
Hash.Target..: File (example0.hash)
Hash.Type....: MD5
Time.Running.: 39 mins, 18 secs
Time.Left....: 2 hours, 6 mins
Time.Util....: 2358385.0ms/142.2ms Real/CPU, 0.0% idle
Speed........: 354.7M c/s Real, 361.7M c/s GPU
Recovered....: 437/6494 Digests, 0/1 Salts
Progress.....: 836548493312/3521614606208 (23.75%)
Rejected.....: 0/836548493312 (0.00%)
HW.Monitor.#1: 0% GPU, 77c Temp

Will update with normal hashcat in 40 mins too if needed.
Input.Mode: Mask (?1?1?1?1?1?1)
Index.....: 0/1 (segment), 56800235584 (words), 0 (bytes)
Recovered.: 27/6494 hashes, 0/1 salts
Speed/sec.: - plains, 1.75M words
Progress..: 4132309664/56800235584 (7.28%)
Running...: 00:00:39:18
Estimated.: 00:08:20:49

I guess that tells me that with mask attack, ocl is faster, but doesnt really give me insight into how much faster.