Hash Rate drops with Dummy Plug

edited January 2014 in Hardware

Hey guys i hope someone can help me out. Im pretty new to this mining stuff and i still havent figured some things out. For example:

I got a R9 280X Sapphire card for the GPU mining. When i plug my monitor in Kh/s is aroung 750. When i switch that plug with a 
Dummy Plug the hashrate drops to 680 kH/s.

Does anyone know about this problem? Thanks in advance,

Specs:

  • Graphic Card: Sapphire R9 280X
  • Motherboard: Asrock 970DE3
  • CPU: AMD Sempron 145
Mining:

--lookup-gap 2
--thread-concurrency 11200 
-g 2 
-I 13
-w 256 
--auto-fan 
--gpu-fan 30-75,30-75 
--gpu-memclock 1500,1500
--gpu-engine 1080,1080
--gpu-powertune -20,-20
--expiry 1 
--scan-time 1 
--queue 0 
--no-submit-stale

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