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Hey, I have a question about using multiple GPU mining. One thing that I've noticed is that the GPU miner tends to use one CPU core per GPU. Having OpenCL capable CPUs makes this more of a problem since the GPU miners can actually run on the CPU cores, but let's not get into that. Anyhow, I wanted to ask if what I said is accurate as to one CPU core per GPU since I'm hoping to put together a 4x HD6990 rig and can only really find 6 core CPUs. If it won't work, then I won't invest in the 4th and useless card. So I need someone to fill me in before I do something stupid.
Thanks!
Edit: I have posted this question in this thread since I will most likely be using this miner until I find that one works better than another. So my question applies mainly to this miner. Feel free to answer for other miner programs too if their mining methods would change the outcome of the answer.
Thanks!
Edit: I have posted this question in this thread since I will most likely be using this miner until I find that one works better than another. So my question applies mainly to this miner. Feel free to answer for other miner programs too if their mining methods would change the outcome of the answer.
I had the same issue. My guess is that you're running at a pretty high aggression. I was running at aggression 12 and getting ~13% CPU usage across all 8 cores (really 4 cores with hyperthreading). You can set the affinity so it only runs on one core, and then I got ~95% CPU usage on just that core, or you can just turn down the aggression.
It took me hours of googling before someone suggested it, but simply going to aggression 9 dropped my CPU usage to 0. My hash rate is about the same and Windows is more responsive. The only downside is that my hashrate drops ~3 MHashs/s when I do things like move windows around or use any aero features.
I'd guess that the max aggression level before you run into CPU usage issues is different for each card, but just try going lower one at a time; from 10 to 9 was like night and day for me.
