Problem with Formula V and Crossfire

[Joshua_Mahr]

I am working on a friends computer for him. It is a Cross V Formula with 16 GB DDR3-1600, FX-8150 8Core, 2 HD6970, 1200W PSU. I installed a clean Win 7 install on a new OCZ Vertex 2. All went well until I installed AMD video drivers 13.1. Once they were installed I got a BSOD after I rebooted. Tried a couple more times and same thing BSOD. There is only a BluRay player and the OCZ ssd on the sata ports, they are recognized by the mobo. They are both in AHCI mode. So I took out one of the Cards and did a new install. Installed driver and then video drivers and it worked fine. No problems so I shut it off and put the second card back in and rebooted. BSOD again. So I check both the cards in another machine and they are both fine. So I put the other card back in the machine by itself and did a fresh install again. Worked fine. Installed driver and video drivers all good. The put the second card in and the xfire bridge and turned the machine back on and BSOD again. Once again I tried a fresh install with both GPU's in and it went well until I installed the video drivers and rebooted then BSOD again. HELP?!

Also bios is latest 17xx. No overclocking. PSU has been checked and is fine.

[Myk_SilentShado]

Are the cards in slots x16_1 and x16/8_3?

[jmoorez2001]

Joshua_Mahr wrote:
I am working on a friends computer for him. It is a Cross V Formula with 16 GB DDR3-1600, FX-8150 8Core, 2 HD6970, 1200W PSU. I installed a clean Win 7 install on a new OCZ Vertex 2. All went well until I installed AMD video drivers 13.1. Once they were installed I got a BSOD after I rebooted. Tried a couple more times and same thing BSOD. There is only a BluRay player and the OCZ ssd on the sata ports, they are recognized by the mobo. They are both in AHCI mode. So I took out one of the Cards and did a new install. Installed driver and then video drivers and it worked fine. No problems so I shut it off and put the second card back in and rebooted. BSOD again. So I check both the cards in another machine and they are both fine. So I put the other card back in the machine by itself and did a fresh install again. Worked fine. Installed driver and video drivers all good. The put the second card in and the xfire bridge and turned the machine back on and BSOD again. Once again I tried a fresh install with both GPU's in and it went well until I installed the video drivers and rebooted then BSOD again. HELP?!

Also bios is latest 17xx. No overclocking. PSU has been checked and is fine.

hmmm may try a differnt crossover bridge ?

[DaemonCantor]

MYK, has a good point. On the Crosshair V Formula Slot's 1 and 3 are used for 2-Way Crossfire and when using them you'll have 16x16 Crossfire. Next your on the right track by installing only one card at a time but you didn't install all of the drivers. Look here for the rest of them you'll need them as well...http://support.amd.com/us/gpudownload/windows/Pages/raid_windows.aspx#2. Now install the Chipset Drivers first then allow it to Reboot then install the AMD RAID Drivers and then Reboot again. For some stupid reason AMD left out some important drivers in the Catalyst Package. If this fails then maybe somebody else with a lot more experience than me might have a different trick for you.

[Joshua_Mahr]

Thanks for the replies.

Tried 3 different bridges.

I installed the AMD drivers also.

I have the cards in the top two slots. MOBO reports them both native x8. Will that cause a BSOD using the top two slots?

[DaemonCantor]

It shouldn't but only the Designers know that...another thing you might try is in BIOS under Extreme Tweaker Tab, towards the bottom you'll see a setting VDD PCIE Voltage and at auto it's set to 1.11300V, you could try to raise this up. I know on the Crosshair IV Formula I used to have it was too low and I was having trouble with 2 independent Cards at the same time and I raised it up to 1.13 and that went away.

[Joshua_Mahr]

I will give that a try.

Does ROG/ASUS staff still patrol the forums will they chime in here?

[HiVizMan]

The folks who patrol this forum are end users like yourself, and others who are in the PC industry but have a strong affinity to the ROG brand.

Could you expand how you checked that the PSU is fine please.

And I am assuming that you have checked the physical state of each of the PCIe slots for any bits of contaminate that might have entered into the slots?

[Praz]

I would test with the video cards in PCIe slots x16_1 and x16/8_3 as noted above per the instructions in the motherboard's manual.

[Zka17]

If both cards are reported in BIOS as 8x, then you definitely placed them in wrong slots...

What is your BSOD code?

What's the brand/model of your PSU? How old it is?