Does this card show up in HWInfo64? If so, the order (indexes) of cards in HWInfo64 is the same as in Atiflash. After identyfing the indexes turn off HWInfo64 and proceed with Atiflash. I suggest using command prompt and a non-GUI version of Atiflash.

If you're asking about voltage setting software - I recommend WattTool http://www.overclock.net/t/1609782/watttool-a-simple-tool-that-combines-overclocking-with-vrm-monitoring-tweaking-for-rx-400-series

Try increasing the GPUs' core and mem voltages.

Make sure that no monitoring software (like HWiNFO64) is launching at the start up. It may impact hashing speed seriously, especially main GPU. In my case it was 28MH/s reduced to 6MH/s on the main GPU.

Hi
I noticed that GPU Memory Errors show up only at the GPU were my display is attached to. Sometimes it's hundreds of millions during 24h, yet not causing GPU to hang or cause BSOD. So perhaps I could live with it but I think that long-term it may cause some unnecessary resets.
When I attach display to a different GPU and restart - errors appear at the GPU where I just connected the display, previous one becomes "clean".

All GPUs are XFX RX 480 8GB GTR BLACK, Asus Gaming 5 Z97 mobo, Win 10, Claymore's Zcash 9.2. All cards have the same BIOS and command line parameters when I start the miner.
Note: If intensity or frequency on the display-attached GPU is reduced, there seem to be less errors but still the issue exist. I also positioned the display GPU as the first one in the rack to get the cold air, so it's the coolest one of all (50C).

OK so after some time I'm 90% sure it was thermal throttling. Thank you again eckmar.
Strange though, that MEM and GPU clocks are not downclocked in such case.

And yes you're right I keep this rig in my house (and I can't move it elsewhere). So I will have to deal with extra noise in one of the rooms. Anyway I will try to add extra fans to this rig so that GPU fans can spin slower and still maintain a reasonable temp.

There's a GPU each 9cm along the rack.

When this issue occured just now I turned the rig off, cooled down the whole room, GPU temp dropped by 10C, started the rig and it... launched with the full speed yay!

So your guess may be the answer to my question! I will speed up the fans and see if that solves the problem as actually they spin very slow. Maybe I have to relax my low noise requirements...
Thanks

Hi,
The rig is: 7x RX 480 8GB, MSI Gaming 5,  15.12 drivers, Win 10
For last several days I observe a new issue:
From time to time this rig will only run at less than 50% of the usual speed (drawing some 70% of the usual power)
This is does not depend on:
- miner (happens with Claymore's ZCash 9.2 and Claymore's CryptoNote 9.6)
- miner settings (like voltages)
- pool (happens with flypool and dwarfpool)

The strange thing is that I can restart the rig many times during an hour or so and the issue is still there. Then magically, without any modifications to the settings or HW, the miner launches at the full speed.

Has  anyone encountered such issue?

edit: When this happens GPU and MEM clocks behave normally that is they run at the max speed.

While I'm fine-tuning my miner a couple of conclusions so far:

Hardware:
MSI Gaming 5 Z97
7x XFX Radeon 480 GTR Black
7x USB Risers (blue) v.005S, Windows 10
PSU: FSP Aurum Pro 1200W 80Plus GOLD
8GB DDR3 1600 low voltage
CPU Intel G3220T @2.60GHz, no mods

Conclusions:

• PEG Gen setting in BIOS - doesn't seem to impact stability, affects power drain slightly (average from 10 measurements taken each 10 sec after achieving a stable temp):
  - Auto/Auto/Auto - 928W
  - Gen2/Gen2/Gen2 - 927W
  - Gen1/Gen1/Gen1 - 919W - stayed with this one
  
• PCI Latency - seems to impact stability
  - Latency 128:  time to failure: 5min42s(BSoD), 21min31s(BSoD), 1min26s(GPU0 fail), 12min03s(BSoD)
  - Latency 32: 2 hours and keeps on running stable - stayed with this one
  
• Windows 7 - don't use it for 5+ GPUs, use Windows 10:)
  
• Other settings: onboard LAN adapter, audio and video disabled, PCIe set to 8x/4x/4x of course
  

Voltages and frequencies are of course main factors of performance/stability and now I'm playing around with best performance vs. power drain
At the moment I'm mining Zcash using Claymore's miner v. 9.1, -cvddc 975 -cclock 1225, intensity 8 and seems stable, Average total 1523H/s, power drain (from the wall) 903W, which gives 1.69H/s/W. Fans running quite at ~30%, GPU temps ~70C, ambient temp 24C, PSU fan also quiet. GPU's BIOS is slightly modded (mem timings to improve ETH mining, quiet fans and lowered voltages at top states)

This helped!
Fresh Windows 10 installation and all 7 GPUs able to run even without 6xGPU MOD! I can't believe how much time I lost trying to get 5+ GPUs to run on Windows 7...

Thank you batko and lbr for help!

Now I "just" need to resolve stability issue of 6th and 7th GPU, which crash always after 5-6 minutes of mining.

While I'm still working on my issue, maybe this could help:
- Does this always happen to the same GPU? If so, swap it with another one and see if the issue follows the GPU or the PCI/riser. If the issue follows the GPU try flashing it with the BIOS copied from a GPU that doesn't fail (backup first).
- Maybe this is miner's feature to slow the card down if it get's overheated - what's the temp it achieves prior to the failure? And the time you spend to reinstall drivers allows the GPU to cool down?

I am so grateful for this hint. Thanks!!
Disabling on-board graphic adapter did the trick.

So now I have another issue. Both 6th and 7th GPU report Error Code 43 in Windows 8 PRO. Previously it was 6th GPU but I hoped that rootcausing 7th GPU start-up failure would help both for issues. Anyway what I already did after launching all 7 GPUs:
1 ) Remove all drivers in safe mode using DDU
2 ) Observe that actually some standard VGA Adapters report issues in Device Manager (code 10, 38, 38, 38 respectively):
https://s27.postimg.org/tx7itnez7/20161211_165713.jpg
3 ) Install 16.11.5 drivers
4 ) Observe that  GPUs on PCI 7, 8 and 6 show Error Code 43
5 ) Run 6xGPU MOD in admin mode
6 ) 1 GPU fixed, GPUs on PCI 7 and 8 show Error Code 43. Physically these are PCI slots: PCI_E1 and PCI_E6.
7 ) Try to revert to original BIOS (using micro-switch on the GPU) - doesn't help
8 ) Re-run 6xGPU MOD - doesn't help
9 ) Reduced RAM from 8GB to 4GB - doesn't change anything (2 GPUs with code 43 remain, so presumably if RAM was the issue more GPUs would cease to work)
10 ) Make sure that by swapping risers, cables, riser cards, GPUs - the issue doesn't change, these are always the same PCI slots that are affected.
11 ) Additionaly I noticed that graphic driver crashes randomly when there is at least one GPU with Error 43 (sometimes even in idle or right after start up).

I will keep on investigating and reading two threads you linked. But it seems in my case issue is related to some basics in Windows since even witout AMD driver there are Standard VGA adapter issues.

Hello,
I'm trying to run 7xXFX RX 480 GTR Black (8GB) on MSI Z97 Gaming 5.

Every time I connect 7th GPU my rig won't even start, it just shows this right after power on:
https://postimg.org/image/45s15sapz/
(80x25 text mode with totally corrupted characters, blinking)

I've tried to:
- use various risers (ribbon powered, ribbon non-powered, two types of USB including version 005S)
- play around with BIOS seetings (GEN1-GEN3)
- add extra PSU (1200W+750W, both 80PLUS Gold)
- turn off all unnecessary devices in BIOS (LAN Adapter, Audio, legacy IO)

None of this helps when all 7 PCI slots are in use. Regardless of what I do, end result is always the same.
With 6 GPUs system starts OK.

Any ideas?