I'm trying to mine with my Radeon 5770 and it working o.k. ~200Mh/sec using m0mchil's python miner. 
 Does this card have one GPU or two?  When I run 'poclbm.exe' it just lists one GPU and one CPU device, is that correct? 
  
   
  
 I have 6 Radeon HD 5770 on three motherboards that I got from Newegg a few weeks ago given the limited choices.  Four are Sapphire cards that run 10 degrees C cooler than the alternatives.   One of the Sapphire HD 5770's crashes when overclocked so I leave it alone. 
  
 The three rigs yield say 1145 MH/sec and the shared UPS draws 850 watts.   I keep the rigs in the crawl space under my Austin home where the ambient temperature is 30 degrees C - with no air conditioning. 
  
 I am very satisfied with these cards for mining. 
  
   
  
  
 Orignal From: Radeon HD 5770 - One or two GPU's?
 
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