Quote from: lbr on December 11, 2016, 05:01:59 AM

Quote from: cc4fun on December 10, 2016, 09:54:44 PM

https://postimg.org/image/45s15sapz/
Any ideas?

Cool ; )

~~What's 80x25? Seems like it's not present in the manual.~~
Ok, that's text mode res ; ) So what does POST indicator say?
@70~77,D2 Late South Bridge Initialization
92~96,B5,D4 PCI bus Initialization@

Display should be attached to GPU in PCI_E2.
CPU PCI-E Lane Configuration -> dunno, but lowest possible, Gen1
PEGX - Gen X-> Gen1
PCI Latency Timer -> play with it
Initiate Graphic Adapter -> PEG
[...]

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.