Dual 7950s GPU0 idling HOT, GPU1 below average, quick troubleshooting direction?

[lostmach]

https://i.imgur.com/HPuQwjx.png

I have two 7950's running on an MSI Z77A-GD65 with default bios settings. I followed this setup guide to the letter: https://docs.google.com/document/d/1Gw7YPYgMgNNU42skibULbJJUx_suP_CpjSEdSi8_z9U/preview?sle=true

Xubuntu 12.04 and,
New cgminer with mostly auto settings. I've quickly tried some manual settings and have got both cards working but they drop to 200Mh/s, still the first card running 2x as hot.

With auto cgminer settings, first card is running twice as hot but not doing anything, second stuck at 400Mh/s.

Thanks for any help.

[txmasut]

First off, are you mining LTC or BTC?

For settings, try  --shaders 1792 --intensity 19 --worksize 256 -g 1 --lookup-gap 2 --gpu-engine 1000 --gpu-memclock 1600 --gpu-vddc 0.95
or  --shaders 1792 --intensity 19 --worksize 256 -g 1 --lookup-gap 2 --gpu-engine 1150 --gpu-memclock 1450 --gpu-vddc 1.25

both of those get me around 605k on litecoin and 600m on BTC using a Gigabyte 7950.

[txmasut]

Oh, and those temps are weird....you should be at around 70-75c if your running those full blast.

[lostmach]

Oh, and those temps are weird....you should be at around 70-75c if your running those full blast.

Yeah right?

I started these on BTC, and will probably move to LTC but I want to get them sorted out first. The cards are the sapphire vapor-x version, voltage locked, I haven't touched the overclocking.

Why is it setting GPU0 to intensity -9? Can the integrated graphics on the board cause issues? I can post what cgminer lists, it looked all normal.

[bajanboost]

Try using risers to get your GPU in a cooler environment - Also, try adjusting your clockrates downwards

[txmasut]

Oh, and those temps are weird....you should be at around 70-75c if your running those full blast.

Yeah right?

I started these on BTC, and will probably move to LTC but I want to get them sorted out first. The cards are the sapphire vapor-x version, voltage locked, I haven't touched the overclocking.

Why is it setting GPU0 to intensity -9? Can the integrated graphics on the board cause issues? I can post what cgminer lists, it looked all normal.

I bet that is why the one number is so low, try disabling your onboard card and see what happens.

[lostmach]

Try using risers to get your GPU in a cooler environment - Also, try adjusting your clockrates downwards

Yeah sure I have some on the way, but why would two identical cards with identical settings produce opposite results?

These are plugged into the PCI-E x16 and x8 slots. I'm not using the crossfire cable. Is there any crossfire setting I also need to disable?

[lostmach]

I bet that is why the one number is so low, try disabling your onboard card and see what happens.

I'll check for the setting again, I had looked earlier and only found the toggle for which video device to activate on boot, IGE or PCI.

[lostmach]

I just read this thread, and his solution was a dummy plug in one of the vga cards: https://bitcointalk.org/index.php?topic=168101.0 His issues look slightly similar to mine.

I'm running the machine entirely headless, but maybe that's else something to try?

[Xenotron]

Try guiminer. I believe you can find its linux version. Its quite simple and stable. You dont need any parameters to put for 7950. Will have 10-15 Mh/s less then on cgminer, but cooler card as well.
When you get stable work on guiminer on ~500-600 Mh/s (depends on overclocking), you may try to play with cgminer once again.

[lostmach]

Try guiminer. I believe you can find its linux version. Its quite simple and stable. You dont need any parameters to put for 7950. Will have 10-15 Mh/s less then on cgminer, but cooler card as well.
When you get stable work on guiminer on ~500-600 Mh/s (depends on overclocking), you may try to play with cgminer once again.

Thanks is there another miner you would recommend that I can run from the command line? I'll try to get guiminer built for linux, and run from the gui to test, but I'd prefer not to have to rely on it.

[vm1990]

i dont know if it will work seen it as a hit and miss solution but if you can try adding the crossfire bridge, you wont get full speed but youll get 90% of the way there

[lostmach]

i dont know if it will work seen it as a hit and miss solution but if you can try adding the crossfire bridge, you wont get full speed but youll get 90% of the way there

Sure, I'll give that a try too, thanks.

[lostmach]

I hooked up monitors to both cards and the issue is fixed. So I will just need the dummy VGA adapters. Now I can move to optimizing the settings for higher performance.

Thanks for the replies!

[Tejsei3]

I hooked up monitors to both cards and the issue is fixed. So I will just need the dummy VGA adapters. Now I can move to optimizing the settings for higher performance.

Thanks for the replies!

Who needs a $15 dummy plug? I used a $0.01 100 Ohm resistor: http://blog.zorinaq.com/?e=11