2nd GPU very slow

[crazydoc]

Code:

andreas@Daedalus:~/Downloads/oclHashcat-1.01$ ./oclHashcat64.bin -b -m 1000
oclHashcat v1.01 starting in benchmark-mode...

Device #1: Cypress, 512MB, 760Mhz, 18MCU
Device #2: Bonaire, 922MB, 1050Mhz, 14MCU

Hashtype: NTLM
Workload: 1024 loops, 256 accel

Speed.GPU.#1.:  8047.2 MH/s                  
Speed.GPU.#2.:  4697.9 MH/s
Speed.GPU.#*.: 12745.0 MH/s
andreas@Daedalus:~/Downloads/oclHashcat-1.01$ ./oclHashcat64.bin -b -m 1000 -d 1
oclHashcat v1.01 starting in benchmark-mode...

Device #1: Cypress, 512MB, 760Mhz, 18MCU
Device #2: skipped by user

Hashtype: NTLM
Workload: 1024 loops, 256 accel

Speed.GPU.#1.:  8050.4 MH/s                  
andreas@Daedalus:~/Downloads/oclHashcat-1.01$ ./oclHashcat64.bin -b -m 1000 -d 2
oclHashcat v1.01 starting in benchmark-mode...

Device #1: skipped by user
Device #2: Bonaire, 922MB, 1050Mhz, 14MCU

Hashtype: NTLM
Workload: 1024 loops, 256 accel

Speed.GPU.#1.:  4697.9 MH/s

Swapping the cards is the last try I think of, because it's a headless server running in a basement room of my house ;-). And what I also noticed is that GPU1 runs at peak core clock, while GPU2 does by far not. And amdconfig always shows a usage of 0%:

Code:

andreas@Daedalus:~$ !141
amdconfig --odgc --adapter=all

Adapter 0 - ATI Radeon HD 5800 Series
                            Core (MHz)    Memory (MHz)
           Current Clocks :    760           1050
             Current Peak :    760           1050
  Configurable Peak Range : [550-875]     [900-1225]
                 GPU load :    95%

Adapter 1 - AMD Radeon HD 7700 Series
                            Core (MHz)    Memory (MHz)
           Current Clocks :    527           1500
             Current Peak :    1050           1500
  Configurable Peak Range : [300-1200]     [150-1600]
                 GPU load :    0%