How to overclock in multi GPU?

[linda7788]

My hardware is:
CPU: Xeon E3-1230 V2
MEM:32G
Motherboard:Asus P8Z77 WS
GPU:HD7970*4(Not CrossFire)
System:Win7 x64
HashcatLite Ver:0.10
CCC Version:12.8

1.I set Performance->AMD OverDrive->High Performance GPU clock settings to 1050Mhz.
   
2.Run hashcatLite "oclHashcat-lite64.exe --custom-charset1 ?l?u?d --pw-min 8 --pw-max 8 --gpu-loops 512 b8631797bbe503304112f6987c2a8581 ?1?1?1?1?1?1?1?1"
3.press s to show run status.

HashCatLite show the GPU info is:
Device #1: Tahiti, 2048MB, 1050Mhz, 32MCU
Device #2: Tahiti, 2048MB, 1050Mhz, 32MCU
Device #3: Tahiti, 2048MB, 1050Mhz, 32MCU
Device #4: Tahiti, 2048MB, 1050Mhz, 32MCU

The crack speed is:
Speed.GPU.#1.: 9050.1M/s
Speed.GPU.#2.: 7972.7M/s
Speed.GPU.#3.: 7979.5M/s
Speed.GPU.#4.: 8004.6M/s
Speed.GPU.#*.: 32910.2M/s

Only GPU 1# overclock and improved speed.
Why GPU 2#/3#/4# are slow then GPU#1?How to improve them?

[User]

Use MSI Afterburn and select which GPU you want to OC.

[epixoip]

why are you using --gpu-loops 512

[linda7788]

why are you using --gpu-loops 512

using 512 will improve crack speed.
if i use --gpu-loops 1024,the display is very slow.
Is this option affect overclock multi GPU?

[linda7788]

Use MSI Afterburn and select which GPU you want to OC.

Thank you very much!
I improve GPU crack speed success!

oclHashcat-lite v0.10 by atom starting...

Password lengths range: 1 - 55
Watchdog: Temperature abort trigger set to 90c
Watchdog: Temperature retain trigger set to 80c
Device #1: Tahiti, 2048MB, 1125Mhz, 32MCU
Device #2: Tahiti, 2048MB, 1125Mhz, 32MCU
Device #3: Tahiti, 2048MB, 1125Mhz, 32MCU
Device #4: Tahiti, 2048MB, 1125Mhz, 32MCU

[s]tatus [p]ause [r]esume [q]uit => s
Status.......: Running
Hash.Target..: b8631797bbe503304112f6987c2a8581
Hash.Type....: MD5
Time.Running.: 0 secs
Time.Left....: 2 secs
Plain.Mask...: ?1?2?2?2?2?2?2
Plain.Text...: ***apco
Plain.Length.: 7
Progress.....: 36574330880/134960504832 (27.10%)
Speed.GPU.#1.: 9765.5M/s
Speed.GPU.#2.: 9773.5M/s
Speed.GPU.#3.: 9769.2M/s
Speed.GPU.#4.: 9772.2M/s
Speed.GPU.#*.: 39080.4M/s
HWMon.GPU.#1.: 14% Util, 62c Temp, 27% Fan
HWMon.GPU.#2.: 14% Util, 62c Temp, 27% Fan
HWMon.GPU.#3.: 14% Util, 62c Temp, 27% Fan
HWMon.GPU.#4.: 14% Util, 62c Temp, 27% Fan
[s]tatus [p]ause [r]esume [q]uit =>

[linda7788]

Use MSI Afterburn and select which GPU you want to OC.

If i running hashcat under ubuntu.
how to OC for all GPU?

[forumhero]

you can use the aticonfig command. it's something like
aticonfig --adapter=all --odsc=800,1000

where 800 is the gpu clock and 1000 is RAM clock

[linda7788]

you can use the aticonfig command. it's something like
aticonfig --adapter=all --odsc=800,1000

where 800 is the gpu clock and 1000 is RAM clock

Thanks very much!