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Crossfire problems (HD 7950)

post #1 of 10
Thread Starter 
(This is my second time writing this, windows update figured it was completely OK to shutdown my computer when I'm in the middle of typing. FFS)

Ok I'll make this breif because I'm tired of typing (Last time I had typed like 3 paragraphs)

Got another 7950 GPU to crossfire with the 7950 I already have.
Works great, no issues. Plays perfect without artifacts.
2 days go by
Turn on computer and computer gets to "Starting Windows" then I get a black screen.
Troubleshoot using HDMI.
Card1 works, Card2 works. Crossfire doesn't work. Try multiple configurations and swapping but get nowhere.
Figure it must be PSU so I get this: http://www.newegg.com/Product/Product.aspx?Item=N82E16817438019
Decide to troubleshoot one more time but use DVI instead of HDMI (Don't usually use DVI to troubleshoot because on my Large Format Display sometimes the post-boot doesn't show)
Card1 works.. Card 2 gives me a black screen if I used DVI. Try combo of DVI and HDMI and I get a 800x600 black square on the HDMI with green artifacts glitching about.
Figure that my display is too high and for some reason isn't registering with the card.
Use an old 1600x900 DVI monitor I had laying around
Works perfect.
Decide to reflow the encoder board on the large monitor (2560x1600)
Still gives a black screen.


So this is what I've come to understand:
My setup was working fine but for whatever reason, decided to glitch out after regular use. I didn't try to overclock, my cards never got above 80C, I never changed any voltage settings.
HDMI works on both but on one of the cards it can't do 2560x1600 for some reason. The weirdest thing is that if one of the cards DVI doesn't work you'd just crossfire 'em and just use
the card with the working DVI ports.. But that's the thing, if I crossfire them and even do as much as plug in the 2560x1600 monitor into the card then both the HDMI and DVI goes black
screen even on the working card (During CF).

I want to point the finger at my monitor, but it was working perfectly up until just a few days ago, and it works fine with one of the cards. I'm actually using the 2560x1600 monitor right
now on the GPU that works.

What I want to know is, why does crossfire work at 1600x900 on DVI but screws up if I plug in the 2560x1600 monitor that I'd been using for days prior? It's like one of the cards can't
do the resolution I want suddenly and I'm at a total loss as to why that's happening. Why does everything else work but a single card can't do 2560x1600 (But can do 1600x900 without issues)?

EDIT: Discovered the above only happens when the problematic card is in the top slot, if its in the bottom slot I get nothing at all.

EDIT EDIT: The instant I install any drivers then the 2560x1600 monitor stops working and crossfire causes black screens.
Edited by Videowarrior - 5/15/14 at 12:10am
Boop.
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post #2 of 10
Thread Starter 
Bump, really need a solution for this. At the moment I have a $160 brick.
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Boop.
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post #3 of 10
Im bumping this for you as well because I have a single 7950, want to go Crossfire, and really need to know about potential problems and solutions. Im sorry that my response doesnt include any tips.
post #4 of 10
Thread Starter 
This situation just completely stumps me, otherwise I could find a solution. In the past I've had graphics cards go out, but when they go out they GO OUT. That mean's they stop outputting video, or start artifacting like crazy. But this one is different, its working in one section but its failing in another section (HDMI works, DVI causes black screens) so I can't correctly diagnose what needs to be fixed on it. I would send it into sapphire for RMA but I'm a second hand buyer from Craigslist and I don't have any of the original purchase documentation.

To add even more confusion, the DVI on the card works at 1600x900 but anything beyond that causes the entire card to "short out" I guess. I even did stress tests at 1600x900 and the card works flawlessly at 1600x900 so the GPU is clearly functioning but for some reason its not scaling. I've been reading that people are having black screen issues just like I'm having (scaling related).

For example:
http://www.tomshardware.com/answers/id-1959724/gpu-scaling-blackscreen-forever.html

The guy can see post-boot text and the bios, but the instant he gets to the OS it blackscreens. The same thing happens to me.

Also the DVI on the card appears to work at 2560x1600 until any drivers are installed, like this guy:

http://www.tomshardware.com/answers/id-1800077/blackscreen-booting-gpu.html

So I'm guessing something got hard-set on the card that makes it freak out and load wacky resolutions that instantly crash the card, however as far as I know the GPU doesn't save information like that.

If I can't find a solution with CCC and scaling I'll try updating the cards bios and see if that's the issue, who knows maybe it got corrupted somehow.
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post #5 of 10
As far as I understand, either HDMI cable or DVI-D (or DVI-I) single link cable can be used only up to a 1080p display while either display port or DVI-D (or DVI-I) dual link cable can be used for a 1600p display. Since you seem to be trying to use a HDMI cable for a 1600p display, I am wondering if you are using a dual link DVI-D (or DVI-I) cable for your setup??? If not, changing your cable to a dual link DVI cable might fix your problem.
post #6 of 10
Additionally I read somewhere on the web that somebody was complaining about MSI R7970 lightning due to the limitation of video connectors. This video card has 4 mini displayports, one single link DVI-D, and one single link DVI-I. Due to this design, you need to use mini displayport if you want to connect this video card to a 1440p/1600p display. Simply you cannot get a stable connection for a 1440p/1600p display with a DVI connection. If you look at the connector of this video card, it looks like working for a dual link cable. However, the electric circuit itself only covers a single link connection. I don't know which video card you are using. It might be a good idea to check out the exact specification of your video card.
post #7 of 10
Thread Starter 
I am using a DVI-D Dual Link cable. I'm using the Sapphire HD 7950 Dual-X with Boost (This is the problem card) and I have no problems running 1600p on my Gigabyte HD 7950 Windforce (The working card). And now I'm also using a brand new EVGA 1000W 80+ Gold Rated PSU (Cost me $160, but well worth it for the quality) so power isn't the issue, the issue is with the card.
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post #8 of 10
Thread Starter 
Bump, still looking for the cause of this. I know its hardware level I just want to figure out what it is so I can fix it.
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post #9 of 10
Thread Starter 
My GPU magically fixed itself while I was at work, now it works flawlessly. I'll keep an eye on it just to be sure.
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post #10 of 10
Quote:
Originally Posted by Videowarrior View Post

My GPU magically fixed itself while I was at work, now it works flawlessly. I'll keep an eye on it just to be sure.

Dont you love when that happens? [sarcasm] Things like that happen to me and then youre suspicious every minute youre running the machine and always waiting for some new problem to pop-up. Its actually a terrible feeling.

I did learn that you can run two different brands of 7950's on crossfire. At least thats what it sounds like youre doing. I always thought they had to be the exact same card. Which is good because I cant find my card anywhere right now new without spending a fortune. Im not sure why its now double the price I paid for it originally.
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