Author Topic: pci-e socket suddenly dropped in performance  (Read 2002 times)

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Offline tulanthoarTopic starter

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pci-e socket suddenly dropped in performance
« on: January 11, 2014, 03:18:46 AM »
I've been running 2x7950s in my rig for a few days with each running at 600 kh/s (I'll call them 1 and 2). I switched gpu 2 out for a third 7950 (gpu 3). Gpu 1 and 3 ran at 600 and 500 kh/s respectively for the day. I then tried to optimize the settings for gpu 3, raising it to 620 kh/s on its own. Then, when I turned on both gpu 1 and 3, the performance of gpu 3 fell from 620 kh/s to 350 kh/s. I get 620 kh/s on gpu 3 when it runs alone, but runs at 350 kh/s when I turn on gpu 1. So I switched gpu 2 back in and it also got low hash rates when gpu 1 is turned on. Now I switched the low performing gpu into a different slot and it's performing like it used to.


Why would a second gpu suddenly drop in performance when another gpu is turned on? Why would switching which slot it is in change the performance?


Offline tryingmining

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Re: pci-e socket suddenly dropped in performance
« Reply #1 on: January 12, 2014, 09:34:20 PM »
hi
what psu are you using ?

 

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