Specs:
2x sapphire 7870
850watt Antec power supply (crossfire certified)
Windows 8.1
I've been trying to crossfire these cards for over 5 hours now and I have had no luck.
The first thing I did was uninstall my current drivers before adding the second card (and connect them with crossfire connector). When I booted my machine up, it would get past the windows logo and then a black screen would appear.
I then went into safe mode and uninstalled the gpu drivers from both cards in device manager. My PC finally booted up and I attempted to install the drivers (13.9) and about half way through my screen just went black.
again I went into safe mode deleted the drivers and rebooted.
I have tried this with 12.10, the drivers that came with the GPU and 13.9 all either freezing my computer or giving me a frozen black screen.
I have tried using a different crossfire bridge, removing the crossfire bridge and trying to install the drivers, and I have tried installing the driver to one card, then installing the crossfire bridge, and I have disabled ULPS. All with the same result.....freezing/black screen and having to reboot.
I have no clue what to do at this point and I am very frustrated. Any help at this point would be nice.
ps I was able to get the drivers installed on a card, plug the crossfirebridge in and boot the computer successfully. But when I selected "enable crossfire" my screen when black and I ended up right back where I started.
try using the beta drivers.
I'm download them right now.
I had a similar problem. If I were you I would Install the drivers with only one card first, then disable ulps and then hook up the second GPU. OH and also if or when it crashes be sure to turn off you pc power supply switch to fully reset the system. Good luck and dont give up. I actually ended up re-installing win7 before I found out about the stupid ULPS stuff, the AMD drivers dont like ultra low power I guess. The main power switch thing helped alot as just a reboot left the drivers "crashed".
I've already done everything you've said. In that order.
Shitty sorry I couldn't help, which MOBO you running?
Asus m5a97. I know it's not the best motherboard for crossfire, but it should still work.
I'll try installing it on one card first again after the beta drivers finish downloading.
Quick question, to save some time could I just leave the second card plugged into the PCI-E slot and just unplug the power when I go to install the drivers on the 'top' card. I'd prefer not to uninstall the second card completely this next time.
Well I did completely remove it and tried each one individually to make sure the cards where ok, Cant say for sure and thats the same mobo I am using. It took a couple of days of dicking around and as I said earlier I did end up doing a fresh install but assumed it was not necessary after the ULPS worked but maybe it was. If I remember anything else I will get back to you. KEEP at it man it will work and then you will be so happy.
Just tried the process again. Same thing, with one card it's fine, but as soon as I add the second card I can't boot into windows.
I think I might try to switch the slots the GPU's are in.
could it be that I need to update my BIOS? that's pretty much the only thing I haven't tried yet.
I believe I found the problem, even though I have been using the one 7870 and it has worked perfectly, I decided to test it by itself again, theres columns of red horizontal lines going down the screen. I think the card suddenly died. I can't install drivers to it, and GPU-Z is saying it's only using 500mhz, when it has 1250.