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Title: Brand new rig fails to properly utilize it's two HD6950 Post by: sodapop on July 15, 2011, 09:53:17 PM The hardware:
MB: P8P67M Pro (http://www.asus.com/Motherboards/Intel_Socket_1155/P8P67M_PRO/) Newest bios CPU: I3-2100 GPU: Asus 6950 1GB (http://www.asus.com/Graphics_Cards/AMD_Series/EAH6950_DCII2DI4S1GD5/) Factory bios, no overclocking SSD, 6gb ram. The problem: When I run any miner (hashkill, phoenix, diablominer), or any combination of miners, I either get around 50-75% utilization of both cards, OR, I get 99% utilization of one card. Basically, I either get sub-optimal performance from both cards, or I get expected performance from one card while the other is entirely starved. This happens at random. If I do get a stable 75%/75% from both cards, it will eventually (maybe after hours) turn into either 99%/0% or 0%/99%. I am running 64-bit ubuntu, 11.04 and Stream SDK 2.4. The two PCIe slots the cards are connected to has x8 speeds according to the motherboard manual. I have installed one crossfire bridge (otherwise I can't use the 2nd card in linux). The temperatures are fine. My CPU utilization is almost nothing. Both cards easily do more than 300MH by themselves. I do not understand where the bottleneck is. Any help with this would be highly appreciated. I'll gladly give 0.1-1btc tips to information that makes a difference. Title: Re: Brand new rig fails to properly utilize it's two HD6950 Post by: drawoc on July 15, 2011, 11:28:52 PM Could you post your Xorg.conf? You can find it at /etc/X11/xorg.conf
Title: Re: Brand new rig fails to properly utilize it's two HD6950 Post by: sodapop on July 16, 2011, 07:14:30 AM Code: Section "ServerLayout" Title: Re: Brand new rig fails to properly utilize it's two HD6950 Post by: drawoc on July 16, 2011, 02:51:15 PM Looks like you only have one card set up - not 2.
Try running: Code: aticonfig --initial=dual-head Title: Re: Brand new rig fails to properly utilize it's two HD6950 Post by: Sideways on July 19, 2011, 08:12:27 AM simple things first, are you pointing your miners at different cards? ie, when you run just polcbm it will tell you that you have to give it a device, usually 0 and 1. You then have to start each miner with a -d0 and a -d1 to use the second card. I like to open a separate terminal for each miner so I can watch them, and usually have 1 or 2 more open to watch temps, etc.
Also, if it's a dedicated miner (not a part time gamer) take out the xfire bridge, it doesn't help ( maybe even hinders.. ) mining. edit: now that I've thought about it and come back, I'm thinkin it is the xfire setup.. I'd start there by taking it out. Title: Re: Brand new rig fails to properly utilize it's two HD6950 Post by: Oldminer on July 19, 2011, 09:00:48 AM Check that your not running 1 of the cards @ PCI-Ex 1 x in the BIOS
Title: Re: Brand new rig fails to properly utilize it's two HD6950 Post by: sodapop on July 20, 2011, 02:58:52 PM I can't say what the problem was, but I am now running the exact same setup on Kubuntu, and I get 99% load on both cards and a decent 650MH with no overclocking.
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