Computer RIG wont boot when 4th card plugged in, pls help

[jeeptits]

4x AMD Powercolor Red Devil 570 4gb
1000W PSU
Older XFX XFX nForce 680i LT SLI motherboard
4gb DDR2 RAM
Intel cpu

3 GPUS power-on and mines no problem, but this motherboard has 4x PCIE so I try t use all for and the computer POSTS but when Windows attempts to begin loading (right before the windows graphic appears after the post) the screen goes kinda black nothing comes up and some white squares appear (sort of looks like a graphical error).

The system pulls 650W mining with 3 GPU, so I dont think its the PSU. Also the error does not occur in a certain PCIE slot, but will occur if I plug a 4th 570 into the motherboards last open PCIE slot regardless. All 4 cards are connected on risers, with sata and 8 pin pwr from psu also, however again this startup problem only occurs when the 4th 570 is plugged into the mobo PCIE. All 4 570's are on risers.

Whats the problem?

Any ideas ?

I could try the system with 4 1060's and see if it happened with them as well, but besides that i'm not sure what the problem could be.. old mobo? nvidia mobo with amd cards ? bios? pcie problem with 4? not sure...

Thanks

[leonix007]

4x AMD Powercolor Red Devil 570 4gb
1000W PSU
Older XFX XFX nForce 680i LT SLI motherboard
4gb DDR2 RAM
Intel cpu

3 GPUS power-on and mines no problem, but this motherboard has 4x PCIE so I try t use all for and the computer POSTS but when Windows attempts to begin loading (right before the windows graphic appears after the post) the screen goes kinda black nothing comes up and some white squares appear (sort of looks like a graphical error).

The system pulls 650W mining with 3 GPU, so I dont think its the PSU. Also the error does not occur in a certain PCIE slot, but will occur if I plug a 4th 570 into the motherboards last open PCIE slot regardless. All 4 cards are connected on risers, with sata and 8 pin pwr from psu also, however again this startup problem only occurs when the 4th 570 is plugged into the mobo PCIE. All 4 570's are on risers.

Whats the problem?

Any ideas ?

I could try the system with 4 1060's and see if it happened with them as well, but besides that i'm not sure what the problem could be.. old mobo? nvidia mobo with amd cards ? bios? pcie problem with 4? not sure...

Thanks

Some brands of motherboard for 680i requires shorting of Pins A1 B17 PCI-e.

Not sure if XFX is one of them

https://bitcointalk.org/index.php?topic=36061.0;all

I don't personally done this before so if you're going to try it, do it at your own risk..

 

[BitBustah]

I had exactly thesame problem a few days ago when I installed my 4th GPU.

I changed "gen4" to "gen2" in the bios, aswell as "enable 4G encoding".


Not sure what bios you have, so just Google these terms for your bios version, it might help.


Good luck.

[Coinerrr]

I had exactly thesame problem a few days ago when I installed my 4th GPU.

I changed "gen4" to "gen2" in the bios, aswell as "enable 4G encoding".


Not sure what bios you have, so just Google these terms for your bios version, it might help.


Good luck.

Exactly this. I’ve got a Gigabyte motherboard and tried to install a 6th card but Windows wouldn’t boot (just a cursor flashing)

After a quick google I enabled 4G in bios and went straight in.

[jeeptits]

Unfortunately I can't find these settings in my BIOS, i'm guessing its an old BIOS... anyway I can update this ? I've run Driver Update software already a few times so I assumed I was updated.. if I am maybe i'm screwed or maybe I need another way for the BIOS ? Its a Phoenix AwardBIOS.

As far as shorting the PCIE way... (since it doesn't seem to matter what PCIE slots are involved, just that it does not work with 4 only 3 570 cards plugged into risers)... would this still possibly solve the problem ?

[BitBustah]

https://www.cnet.com/products/xfx-nforce-680i-lt-sli-motherboard-atx-lga775-socket-nforce-680i-lt-sli-series/specs/

Expansion Slots
1 x CPU
4 x DIMM 240-pin
2 x PCIe x16
1 x PCIe x1
2 x PCI

https://tweakers.net/pricewatch/153780/xfx-nforce-680i-lt/specificaties/

Card Interface (moederbord)   2x PCI, 2x PCI-e x1, 2x PCI-e x16

It looks like you have 4.........? Are they marked as "PCIe" on the board itself?

[jeeptits]

It looks exactly like this one https://tweakers.net/pricewatch/153780/xfx-nforce-680i-lt/specificaties/

You can see that there is a 16x PCIE down in-between the normal 2 PCI slots.

Specifically, when I plug 4 570 GPUs in, regardless of plugging the 4th into the 2nd PCIe 1x slot, or the second PCIe 16x slot.