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im buying 7x Rx 470 4g nitro oc+ , and motherboard using msi z97 gaming 7 have 4 Pcie x1 and 3 pcie x16, after plug all card, the system only see 5 vga, how to make all vga avaible ?

this 2slot not showing any pcie connect

http://s12.postimg.org/cil02o6v1/slots.jpg

have tried this method
-use 2vga (main slot +1 slot of them) is working perfect
-use 3vga (main slot + both of them) only connect 2 vga, main slot + x1 last slot, the x16 seem offline
-use all slot (7pcie) only connect 5 vga the 2 vga (marking in cyrcle) seem offline.

what operating system are u using ?  win 10 ? win 8 ? win 7 ? Linux ? Ethos ?

win 10 64bit

Did you try go into bios and set PCIE to Gen1 (or try Gen2) and set the bus to 8x 4x 4x?

The msi gaming "7 GPU" boards only work with 6 unless you use a 16x - 16x riser for the first 16x slot. Hopefully someone can figure out a better way soon.

I have 7 going with 4 470s, 1 370, 1 380 and 1 1070.

have try it, but not work. still have 2 slot showing offline at bios

You might try to disable audio card, etc anything you not need in bios... but having more then 5+ cards is asking for problems

Iam not using any custom audio card, just onboard audio, must i disable it too, in bios ?

I don`t know, might free some mobo resources, so try it

also it might have to do also with rx 4xx, some ppl reported older card worked fine 7-8 per mainboard but not rx 4xx

this might help :
https://bitcointalk.org/index.php?topic=1645370.msg16591718#msg16591718 (https://bitcointalk.org/index.php?topic=1645370.msg16591718#msg16591718)

i know from my personal experience , some msi z77 board need shorting to get all pcie work , im not sure about z97..
Some motherboard don't need presence shorting at all. Some need only 1 or 2 slots shorted, Some need all of them shorted. First You will only need to short the slots that have the detection problems though

Thanks for your help.
will try it soon :)
i will update it, hope the problem can fixed

@xxcsu it's working for x1 slot , how about x16 slot ?

use ethos the vga listed 6pcs, and all of thenm working perfect after i set at bios
pcie 1 (gen 2)
pcie 2 (gen 1)
pcie 3 (gen 3)

but after i update my bios, and reinstal the OS to windows the problem come again, only 5vga active at my board :'(

enable crossfire on radeon crimson setting, then you should able to run all 7 gpu on that,
i have z87 gd65, when crossfire disable(only 5 gpus can run) if cannot to activate cf ,try to reinstall driver, it would help, but all card need to attach when installing driver

This is not really true, i use 7 16x to 1x USB ver 006 risers and it works.

my settings

PCIE1 gen2
PCIE2 gen2
PCIE3 gen2

configuration 8x4x4x

primary display adapter: PEG

windows 10

drivers 16.10.3

How to identify these
PCIE1 gen2
PCIE2 gen2
PCIE3 gen2

configuration 8x4x4x

I have MSI Z97 Gaming 5 Motherboard and everytime 4-5 cards detects.
Reinstalling drivers again and again nothing good so far
Please guide more

Try this: clear the CMOS by shorting the pins on the MOBO while turned off.  Then use one single GPU to test every slot, then connect one by one progressively, with restarts in between.

That is how I have got that mobo to work with 6, but I have never got it to work with 7 gpu, maybe because I am using windows 8.1

I would really love if someone could help me with another issue you might encounter in the future.

For some reason, after a couple of hours mining perfectly, one gpu drops its mem clock from whatever stock setting it is to 300, which causes that gpu to mine a 1/5 % of the speed, usually around 47 sols/s (amd 470 4 gb modded). so I am constantly having to reinstall drivers, patch, etc, to get it work normally again, since simple restarts do not solve the problem.

I ordered 1 H81 mb with 6x rx 480
so can you please explain how you connected the evga G2 molex to the raisers?
are you connect the molex which is in series to the usb raisers direct!!
If yes then I only see 5 molex while you need 6, or you use one sata as the 6th!!!
any help would be appreciated.

Actually work flawlessly with 7 RX 470 cards on 1x16 risers, i have two such rigs working for two months. Just set all PCI to Gen 1, Disable onboard Video and Audio, and make sure u arent using the mPCI slot for SSD as that disables the last two slots.

I tried to reproduce your issue with the Gaming 5.And I found out when the mobo is just showing up 5 pcie.
It happens when you set the PCI Clock higher than 32 Cycles. If you set it back to 32 all cards will show up.

Still waiting any experienced answer pls!!!