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+--- Thread: Speed drops down by a half after a few seconds (/thread-2440.html)
Speed drops down by a half after a few seconds - qweasd - 07-11-2013
Hi,
When I run oclHashcat (plus or lite), the two AMD hc7900 GPUs run about at the same speed:
Ater 6s:
Code:
Session.Name...: oclHashcat-lite
Status.........: Running
Hash.Target....: ee98e55f3f62a11697889e502d237d3d
Hash.Type......: NTLM
Time.Started...: Thu Jul 11 12:47:39 2013 (6 secs)
Time.Estimated.: Thu Jul 11 12:50:21 2013 (2 mins, 30 secs)
Plain.Mask.....: ?1?2?2?2?2?2?2?3
Plain.Text.....: **lrz4m$
Plain.Length...: 8
Progress.......: 219414528000/5533380698112 (3.97%)
Speed.GPU.#1...: 17673.5M/s
Speed.GPU.#2...: 17671.4M/s
Speed.GPU.#*...: 35344.9M/sBut after some time, the speed of GPU #1 drops down by a half:
Ater 42s:
Code:
Session.Name...: oclHashcat-lite
Status.........: Aborted
Hash.Target....: ee98e55f3f62a11697889e502d237d3d
Hash.Type......: NTLM
Time.Started...: Thu Jul 11 12:47:39 2013 (42 secs)
Time.Estimated.: Thu Jul 11 12:51:08 2013 (2 mins, 40 secs)
Plain.Mask.....: ?1?2?2?2?2?2?2?3
Plain.Text.....: **585ih7
Plain.Length...: 8
Progress.......: 1415894794240/5533380698112 (25.59%)
Speed.GPU.#1...: 8239.9M/s
Speed.GPU.#2...: 17464.4M/s
Speed.GPU.#*...: 25704.3M/sI tried playing with the --gpu-temp-retain, --gpu-accel, --gpu-loops switches, but no changes.
I am on 2008 R2 with 2x hd7900.
Any ideas?
Cheers
RE: Speed drops down by a half after a few seconds - atom - 07-11-2013
Looks like your card hit 90c temperature. In this case GPU bios will clock down your card to 300 Mhz or less.