Topic: Could not get unpowered 1x16 riser cable to work (Read 1492 times)

Some slots may share lanes/resources with other devices, which can screw things up.  Some decent motherboard manufacturers (Asus) list what's shared with what in the manual.  Though, you're using Gigashyte, so you're probably back to the trial and error method.

No I didn't but I'm not sure how that will make a difference

Tried all PCIE x1 slots?

No luck.  Same thing.  Oh well

I'll give it a try

So both aticonfig and lspci are showing 4 cards.
I cant be sure about all six cards, but at least an additional card should work with the presence pin trick.

Just recently bumped into the same issue (a fifth card not recognized) and the trick did the...trick

I got 4 cards in right now

* 0. 01:00.0 AMD Radeon HD 7800 Series                                                                                                                                                                                                                                        
  1. 02:00.0 AMD Radeon HD 7800 Series                                                                                                                                                                                                                                        
  2. 04:00.0 AMD Radeon HD 7800 Series                                                                                                                                                                                                                                        
  3. 07:00.0 AMD Radeon HD 7800 Series    

All the cards showed up

00:00.0 Host bridge: Advanced Micro Devices [AMD] Family 15h (Models 10h-1fh) Processor Root Complex
00:00.2 IOMMU: Advanced Micro Devices [AMD] Family 15h (Models 10h-1fh) I/O Memory Management Unit
00:02.0 PCI bridge: Advanced Micro Devices [AMD] Family 15h (Models 10h-1fh) Processor Root Port
00:03.0 PCI bridge: Advanced Micro Devices [AMD] Family 15h (Models 10h-1fh) Processor Root Port
00:04.0 PCI bridge: Advanced Micro Devices [AMD] Family 15h (Models 10h-1fh) Processor Root Port
00:05.0 PCI bridge: Advanced Micro Devices [AMD] Family 15h (Models 10h-1fh) Processor Root Port
00:07.0 PCI bridge: Advanced Micro Devices [AMD] Family 15h (Models 10h-1fh) Processor Root Port
00:10.0 USB controller: Advanced Micro Devices [AMD] Hudson USB XHCI Controller (rev 03)
00:10.1 USB controller: Advanced Micro Devices [AMD] Hudson USB XHCI Controller (rev 03)
00:11.0 SATA controller: Advanced Micro Devices [AMD] Hudson SATA Controller [AHCI mode] (rev 40)
00:12.0 USB controller: Advanced Micro Devices [AMD] Hudson USB OHCI Controller (rev 11)
00:12.2 USB controller: Advanced Micro Devices [AMD] Hudson USB EHCI Controller (rev 11)
00:13.0 USB controller: Advanced Micro Devices [AMD] Hudson USB OHCI Controller (rev 11)
00:13.2 USB controller: Advanced Micro Devices [AMD] Hudson USB EHCI Controller (rev 11)
00:14.0 SMBus: Advanced Micro Devices [AMD] Hudson SMBus Controller (rev 14)
00:14.2 Audio device: Advanced Micro Devices [AMD] Hudson Azalia Controller (rev 01)
00:14.3 ISA bridge: Advanced Micro Devices [AMD] Hudson LPC Bridge (rev 11)
00:14.4 PCI bridge: Advanced Micro Devices [AMD] Hudson PCI Bridge (rev 40)
00:14.5 USB controller: Advanced Micro Devices [AMD] Hudson USB OHCI Controller (rev 11)
00:15.0 PCI bridge: Advanced Micro Devices [AMD] Device 43a0
00:18.0 Host bridge: Advanced Micro Devices [AMD] Family 15h (Models 10h-1fh) Processor Function 0
00:18.1 Host bridge: Advanced Micro Devices [AMD] Family 15h (Models 10h-1fh) Processor Function 1                                                                                                                                                                            
00:18.2 Host bridge: Advanced Micro Devices [AMD] Family 15h (Models 10h-1fh) Processor Function 2                                                                                                                                                                            
00:18.3 Host bridge: Advanced Micro Devices [AMD] Family 15h (Models 10h-1fh) Processor Function 3                                                                                                                                                                            
00:18.4 Host bridge: Advanced Micro Devices [AMD] Family 15h (Models 10h-1fh) Processor Function 4                                                                                                                                                                            
00:18.5 Host bridge: Advanced Micro Devices [AMD] Family 15h (Models 10h-1fh) Processor Function 5                                                                                                                                                                            
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Device 6819                                                                                                                                                                                            
01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Device aab0                                                                                                                                                                                                        
02:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Device 6819                                                                                                                                                                                            
02:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Device aab0                                                                                                                                                                                                        
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)                                                                                                                                                    
04:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Device 6819                                                                                                                                                                                            
04:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Device aab0                                                                                                                                                                                                        
05:00.0 USB controller: Etron Technology, Inc. EJ168 USB 3.0 Host Controller (rev 01)                                                                                                                                                                                          
07:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Device 6819                                                                                                                                                                                            
07:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Device aab0    

Everything shows up.  It just doesn't work, and I couldn't find any settings in the BIOS that would help.  Oh well I guess I need to buy another motherboard.  Would have been nice, and saved me some money, but nothing ever seems to go as planned.  

I feel like your avatar lol

What does the:
say?

Or:
?
Are there 6 vga adapters found?

Anyway, it could be that you cant use all PCIE x1 slots at the same time. It depends on the motherboard.

I see now, but the cards showed up in all but that one slot.  Its when I went to test if everything was working with that I had problems.

Shows cards in all slots but the #2

But when I test with  and is when things go wrong

I'm going to try some bios setting first, and then maybe the pin shorting.

Not sure what that is.  Tried looking it up.  Found mention of it, but nothing telling me what it is.

It did lead me to some possible bios settings that might help.

OK, read this (some other good info in there): http://blog.zorinaq.com/?e=42

You could try the presence pin shorting trick.

I got 6 7850's, and I tried to put them all on one mobo using unpowered riser cables.  I'm running Xubuntu 12.04, cgminer 3.0.0, Catalyst 12.08.  The motherboard is a GIGABYTE FM2 AMD A85X with 3 PCI-E x1 slots and 3 PCI-E x16 slots.  I'll provide links.

http://www.newegg.com/Product/Product.aspx?Item=N82E16813128566
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202004

Here are my results

0  (x1)  Yes
1  (x16) Yes
2  (x1)  No
3  (x1)  Does not even show up
4  (x16) Yes
5  (x16) Yes

So I disconnected the #2 and #3 cards, and this is what happened

0  (x1)  Yes
1  (x16) Yes
2  (x16) No
3  (x16) No

So I have no idea what I'm doing wrong.  I was using 2 750w power supplies.  If there is some trick to making this work, I would really like to know, but for the time being I'm going back to using 3 cards per board. 

Thoughts and comments, are very much appreciated.