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Title: Radeon HD 7660D Onboard dramatic drop in MH/s Post by: bigbeninlondon on April 21, 2013, 09:22:25 PM So for some reason my onboard Radeon HD 7660D just dropped from over 80 MH/s down to 20. I can't figure out why and I can't get it to go back up. I just reinstalled the drivers, nothing. Temp would sit at 65-70 C with spikes to 75 Csometimes, now 30-35 C even when mining. I'm using GUIMiner v2012-12-03; mobo is Gigabyte GA-F2A55M-HD2 with AMD A10-5800K APU, 650W PSU, 16GB RAM on Win7 64.
What can I check? What would cause me to lose 75% of my hashing power? Title: Re: Radeon HD 7660D Onboard dramatic drop in MH/s Post by: bigbeninlondon on April 22, 2013, 10:52:48 AM Anyone? No thoughts? I know 80 MH/s isn't much, but my whole configuration is putting out 1 GH/s so I'm not worried too much about the revenue. I worry more that something happened to the mobo itself. Dropping from 80 to 20 seems to point to something gone wrong. I just don't know what else to check.
Title: Re: Radeon HD 7660D Onboard dramatic drop in MH/s Post by: Marrs on April 22, 2013, 07:52:03 PM This post seems to suggest the AMD APUs get recognized as two separate bits of hardware, so they require two separate workers in GUIMiner:
https://bitcointalk.org/index.php?topic=26145.msg1816794#msg1816794 Title: Re: Radeon HD 7660D Onboard dramatic drop in MH/s Post by: bigbeninlondon on April 23, 2013, 10:26:09 PM That's true; but the one that signifies the CPU portion only hashes around 1 MH/s so I don't use it. The onboard card alone used to get me 80 MH/s, and then one day just dropped to 20 MH/s with no evidence as to why.
Edit to add: I feel almost like something else is mining on my onboard and taking my hash power. Is this possible? Title: Re: Radeon HD 7660D Onboard dramatic drop in MH/s Post by: bigbeninlondon on April 24, 2013, 11:41:16 PM So I discovered the solution. For some reason when a monitor is not plugged in to the card it gets significantly less hash power. Weird.
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