does it show the GPUs in the list once it starts running?
it should show all the possible mining targets that it is setup for, so if you had 2 gpus it should show those on the list (in my experience anyway).
I had an issue where I had to rerun the aticonfig command once I added more GPUs or it would not recognize them. Mine does not allow me to mine on the CPU however, so I don't know any more than that currently
if i write: cgminer -n, i get:
[2013-04-07 15:14:09] CL Platform 0 vendor: Advanced Micro Devices, Inc.
[2013-04-07 15:14:09] CL Platform 0 name: AMD Accelerated Parallel Processing
[2013-04-07 15:14:09] CL Platform 0 version: OpenCL 1.1 AMD-APP-SDK-v2.4 (595.10)
[2013-04-07 15:14:09] Platform 0 devices: 2
[2013-04-07 15:14:09] 0 Cypress
[2013-04-07 15:14:09] 1 Cypress
[2013-04-07 15:14:09] 2 GPU devices max detected
I think that the gpus are correctly configured.
I will try to update the driver.
I think i had to reinstall the driver after I booted the system with all cards plugged in. The driver would not auto activate all cards. So if you install the drivers with 1 card plugged in, then restart and plug all of them in, I had trouble getting it to show them all. Then i reinstalled the drivers while the system had all cards plugged in and it worked after I re-ran:
sudo aticonfig --adapter=all -f --initiall
Perhaps the higher voltage causes the mining speed to decrease (doesn't make sense, but neither does anything else that's happened with them). Since I only am running two until my risers get here, maybe I will just exchange the other two for vanilla vapor-x cards. If I can get those doing that they are supposed to, it would be worth the hassle for an extra ~150kh per card.
My limited understanding is that the cards have a feature called Powertune Boost which dynamically manages clockspeeds and voltages for maximum performance.
That may be desirable in a gaming scenario where the rendering load changes from scene to scene, but not so desirable in a constant 100% load scenario.
See:
http://www.pcper.com/reviews/Graphics-Cards/AMD-Radeon-HD-7950-3GB-PowerTune-Boost-ReviewMy Sapphire 7950s have a little blue buttons on them that change the BIOSes and apparently also enable/disable Boost. I had the buttons enabled during the first few hours of mining/testing (thinking boost = more performance? yes please!) and noticed that the clock speeds jumped from 925/1400 to 850/1250 all the time. Just like the picture of Metro in the review above. (which is mislabeled with FPS instead of Mhz on the y-axis but you get the idea)
Once I disabled the buttons and switched back to the regular non-boost BIOS, my clock speeds and voltages smoothed out and the hashing performance improved dramatically.
As I’ve mentioned, I suppose the feature makes sense for games where you have rendering performance valleys and spikes that allow Boost to make the most out of the available TDP envelope, but it doesn’t make much sense under constant load.
I think I had them disabled already, but just for kicks I enabled one of the buttons on one card .. it destroyed the hashrate and now cgminer reports it as "sick" whatever that means
as an update, before i tried to push that blue button, i upgraded to 13.10 drivers and it got me about 5 more kh so I was at 525kh for each card... now i'm wrestling to get all 4 working again ... don't push that button!
