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Crossfire 7970 worse PERFORMANCE than single card, need help, tweaks etc...

post #1 of 37
Thread Starter 
I purchased a second MSI 7970 last week to go along with my original HIS 7970 as im using eyefinity. The single was working quite well with pretty much medium settings and no aa running about 45fps in most games like bf3, crysis 3 etc. Sometimes better sometimes slightly worse, but ALWAYS smooth. Anyway i though i would like to be able to turn aa back on and hopefully reach 60fps as well with a second card.

The result of adding the second 7970 has been less than pleasing, while frames per second have increased notably and i am indeed getting above 60 fps in nearly all games with aa turned back on the gameplay is extremely choppy and not smooth. Feels alot more like 20 to 25 fps on a single card, I'm wondering if anyone has any tweaks or solutions that may have worked for them, not necessarily in eyefinity but just with crossfire in general.

What i have tried so far..

I have the new AMD beta driver installed with the caps profiles.

I originally had the HIS 7970 in the top slot as the primary but switched them around and now have the MSI 7970 as primary for a very slight improvement. The HIS overclocks slightly better but i have them synchronized to the same speeds with afterburner to 1075 for core clock and 1550 for memory clock with +20 power limit.

I have tried rivatuner fps limiter with limited success. It seems to be the best bet so far. Some games still experience what i would describe as stutter rather than the choppy gameplay i described earlier which is a better result but still not ideal. Also i find myself having to limit my frames to what i could already achieve with a single card making crossfire pointless.

I have tried using D3D override and forcing triple buffering, again with limited success, not sure if v-sync should be enabled or disabled with triple buffer, or whether or not i should be using the fps limiter with triple buffer?

I have turned ULPS off in the registry.

I have tried at stock clocks and it just runs worse.

Any help with tweaks or anything at all would be great. Feel like i have just blown $400 bucks on a 2nd card that does little to nothing. Not to mention the eyefinity setup that is usable with a single card but not really at the level i would like meaning if i can't sort out crossfire it's a god chance i will be heading back to a single screen with a single gpu losing more money again in the process. Thanks.
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post #2 of 37
Could you log both cards data while playing with a tool? If you launch two instances of GPU-Z for example, you can let each one log for a specific card. There you can see how clockrates are behaving during your game. I don't have Crysis 3 nor BF3. However for Far Cry 3 I can indeed say while FPS went up by adding another 7970, the game overall doesn't feel as smooth as I expected it to be. The talk about microstuttering is no complete nonsense after all.

For my Crossfire setup, I haven't done anything special. Just added the 2nd card, reinstalled the drivers (using 13.3 Beta 3 atm) and enabled Crossfire. I don't use any tools like Rivatuner or frame limiters. In most games I tried, performance is really better. In some cases, like the mentioned FC3, things aren't as smooth. Tomb Raider for example, while I can play this game in CF mode with everything maxed, has some sort of input lag only noticeable in CF mode.
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post #3 of 37
Thread Starter 
See for me tomb raider is one of the few that works ok. Not fantastic but one of the better ones. Far Cry 3 is unplayable for me, literally unplayable as was batman arkham city until i applied the fps limiter to 45 and disabled dx11, and i'm pretty sure i could have achieved those settings with a single 7970.. I have msi afterburner which monitors both if thats what your asking? That shows them both running at the same clock speeds.
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post #4 of 37
Have you tried radeon pro 1.1.1 yet? That helped me with alot of my problems with my 7870's.


edit: Also you do not need the app profiles with the 13.3b. It is in it already
Edited by jeffro37 - 4/8/13 at 8:13am
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post #5 of 37
Thread Starter 
Quote:
Originally Posted by jeffro37 View Post

Have you tried radeon pro 1.1.1 yet? That helped me with alot of my problems with my 7870's.

I have downloaded it but i am completely lost with that program. Any decent tutorials or advice? I use to have a nvidia 670 and used nvidia inspector so i'm assuming it's similar?
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post #6 of 37
how did you install he second card ?? (not physically, but from the POV of the drivers) I recently added anther 7850 to mine and initially i too faced a similar problem where the max frames went up, but gameplay worsened. Then i uninstalled the previous 13.1-rebooted to safemode-used Driver sweeper to get rid of ATI drivers - booted to normal windows- installed latest 13.2 beta. This increased my min FPS as well as my average fps.

try this way and maybe you'll also see an increase.
post #7 of 37
Thread Starter 
Quote:
Originally Posted by huzzug View Post

how did you install he second card ?? (not physically, but from the POV of the drivers) I recently added anther 7850 to mine and initially i too faced a similar problem where the max frames went up, but gameplay worsened. Then i uninstalled the previous 13.1-rebooted to safemode-used Driver sweeper to get rid of ATI drivers - booted to normal windows- installed latest 13.2 beta. This increased my min FPS as well as my average fps.

try this way and maybe you'll also see an increase.

Did you notice a improvement with the smoothness as well? i will give that a go now and update. Thanks. I posted this on toms hardware as well and they are saying different brand of cards is a likely issue. I had read that different manufacturers were irrelevant, if this is a issue would flashing the bios to the same bios resolve that issue?
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post #8 of 37
I don't think your doing anything wrong. Its an AMD problem. Google "frame rating vs Fraps". Using two cards will seem faster according to FRAPS, but what you see on your monitor is not. Read this article.
http://www.pcper.com/reviews/Graphics-Cards/Frame-Rating-GeForce-GTX-Titan-GeForce-GTX-690-Radeon-HD-7990-HD-7970-Cross-0
post #9 of 37
Quote:
Originally Posted by thelude View Post

I don't think your doing anything wrong. Its an AMD problem. Google "frame rating vs Fraps". Using two cards will seem faster according to FRAPS, but what you see on your monitor is not. Read this article.
http://www.pcper.com/reviews/Graphics-Cards/Frame-Rating-GeForce-GTX-Titan-GeForce-GTX-690-Radeon-HD-7990-HD-7970-Cross-0

-.-'
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post #10 of 37
Hmmm, what a "convenient" thread given the latest controversy... rolleyes.gif
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