GA-990FX-UD5 6 GPUs?

[broken_pixel]

Anyone else out there able to get 6 GPUs recognized on the GA-990FX-UD5 board? I am able to get 5 mining but can't get six GPUs to recognize. I have tried shorting the 1x and the PCIEX16_2 slot since that slot needs to be vacant to get 5 GPUs running.

Specs
GA-990FX-UD5
5 R7950s 12.6 drivers, powered risers
NEX1500 PSU
Windows 7 64bit

[veox]

What is your operating system?

[broken_pixel]

I am using Windows 7 64 bit. Thanks for the reply.

[veox]

I think Windows doesn't support more than 5 GPUs. I don't use Windows, though, so could be wrong.

[lbr]

I'm using Gigabyte GA-990FXA-UD3 rev. 3.0 with 4 GPUs on Win2k8 r2
I've not tried yet sticking two more, but I had issues with 4 GPUs, like ADL mismatches, cards working on half performance, random hangs, cards simply dissapearing from Device Manager..

Solutions I've used
1) Use x16 -> x16 risers on x16 slots, probably the same as inserting wire
2) Make x16 plugged in card to be first to initialize in the BIOS
3) Connect monitor to the same card, x16, first to init

I'll(probably) connect two more GPUs and will report.

[gendo]

Please try and reply I am desperate , i have tried using this motherboard with xubuntu 12.10 (i am a experienced user) , powered risers and 2 7950 and 1 7870 .
The problem is that if the card  is plug in the pci express-2 or any of the other except the first pci express 16x  or 1x pci express it tends to hang using the lastest version of cgminer after a couple of seconds i even got a hard hang on the server on some ocacions tipically you get first half of the shares as acepted and the other as hw till sudenly the cards stops submiting shares and you get the "sick" card sign , i am sure that adm sdk and all the other drivers are ok. I am running a headless installation but use dummy plugs in one card which is sucessfuly detected , my concern is because this week 2 more 2950 are arriving and i can only right now mine with 2 cards, please help me.

A friend sugested me that pci bus negociation runs in high end cards with a dedication soc and in this kind of mobos straitgh with the procesor i am using a phenom x4 3.2ghz just in case its useful although i research some of the eee documentation on the pci express standard and cant find anything about it so please if anyone can help me it would be much apreciated specialy considering the dificualty rise jaja.

[Bitcoin-QT]

I think Windows doesn't support more than 5 GPUs. I don't use Windows, though, so could be wrong.

Yes it does.

[lbr]

Ok, I've successfully tested 6GPUs setup.

Gigabyte GA-990FXA-UD3 rev. 3.0
2x6950 + 4x7950 connected with x16_x1 PCIe non-powered risers
Windows 2k8 R2

Catalyst 12.6 - driver only, AMD service disabled(Device Manager-> right click on device -> update driver -> point to unpacked Catalyst folder)
After driver installation I've run OpenCL.msi, located in Catalyst_12-6/Packages/Apps/OpenCL64/ <- this probably is not needed for Windows 7, but on server OpenCL never installs with the driver for me.

cgminer 3.1.1 / 3.2.0

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
setx DISPLAY ":0" <- without this windows server won't start any GPU.


edit 2013/07/28: After running ~2months 24/7 my rig burned ; ) PSU ATX motherboard connector to be exact.