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post #11 of 22
Hope this helps:
Quote:
We experienced stuttering and jerky behavior with Radeon HD 6970 CrossFireX. I wouldn't say that it is "MicroStutter," it is outright "stutter" or a "jerky" feeling as you play. As you move through the map you can see and feel that it is not smooth, not consistent, and you can visually see this as you are walking. There is a lot of straight line walking during the first few minutes of the map, and it is very easy to identify and breaks the immersion of the gameplay. We started with the GTX 580 SLI and experienced smooth gameplay, and then when we installed HD 6970 CFX to compare performance the constantly laggy experience was immediately noticeable.

The jarring behavior is so bad that it is distracting to gameplay, and is not a configuration I would use if I were playing BF3. After having used both GTX 580 SLI and 6970 CFX in this first mission, I can easily say GTX 580 SLI is the better experience and what I would use when playing. AMD has a lot of work to do with CrossFireX, while the performance is there, the smoothness and consistency is not even closely competitive with SLI configurations. Now, it could be a simple in-game graphics option that is causing the issue, but it is something we will have to look at closer as we play the game more.

Update On Stuttering - Fix Available


Concerning the CrossFireX stuttering mentioned above, AMD has informed us that the 11.9 CAP 3 that was recommended to install for BF3 is actually the culprit for the stuttering behavior with CFX in this game. AMD recommends to uninstall the CAP and only install Catalyst 11.10 Preview 3 driver. If you already have the CAP installed, your best bet is to uninstall the CAP as well as the driver, and re-install just the driver with no CAP. We have tested this by removing the CAP, and on our system the stuttering with 6970 CFX is gone. We experienced no negative impact to performance in the game by removing the CAP. The gameplay experience is much better with the CAP uninstalled.

"One note – about the stuttering for CFX, the latest CAP is causing that, once you remove it, you should be fine…we’re on it and fixing it as we speak." -AMD

http://www.hardocp.com/article/2011/10/25/battlefield_3_preview_performance

Good luck!
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post #12 of 22
I am seeing over 2700mb of vram in afterburner in eyefinity. I also see up to 66% RAM usage. I am running most everything on Ultra but no AA since it causes really low FPS.
post #13 of 22
mine felt choppy with everything on low with 1 6870 but i have 11.8 i think
I should game.
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I should game.
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post #14 of 22
BF3 uses at most 1010MB of my Vram.
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post #15 of 22
Pfffft.......check out my VRam usage. And no, I'm not using Eyefinity. This is 1920x1200 on Ultra/Max 8xAA 16xAF.

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post #16 of 22
Judging from everyone's figures on vram usage vs. Perf..I'm going to go out on a limb and say frostbite 2 has some sort of dynamic vram scaling. Using what vram you have but not causing performance issues. Uses about 1100 at the most on my rig.

Sent from my SAMSUNG-SGH-I777 using Tapatalk
post #17 of 22
Crysis 2 does this too. With 6950 CF it used up to ~1.9 GB VRAM, and with Eyefinity all the way to 2 GB. I think there was even some tests done with 3 GB 580 and it used up to 2,7 GB with Nvidia Surround. I think both of these games simply store stuff in advance to VRAM, so the games don't actually need that much VRAM, but it might make loading a bit smoother in some cases. The difficult thing is to recognize the point where VRAM usage is too high and starts to affect performance drastically.
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post #18 of 22
Thread Starter 
hmm so vram is not an issue?

guess ill wait a little for a patch or somthin
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post #19 of 22
Quote:
Originally Posted by ezikiel12 View Post
Judging from everyone's figures on vram usage vs. Perf..I'm going to go out on a limb and say frostbite 2 has some sort of dynamic vram scaling. Using what vram you have but not causing performance issues. Uses about 1100 at the most on my rig.

Sent from my SAMSUNG-SGH-I777 using Tapatalk
yup pretty much. game uses 1250MB of vram with postfxaa set to high and 0xmsaa. game uses 1250MB of vram with postfxaa set to high and 4xmsaa.

1920x1080.
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post #20 of 22
i play BF3 on 1600p and i use around 1.4GB

INSANE!

i have a gtx 580 vanilla and it doesnt seem to have enough vram... i mean if i wanted to SLI i couldnt. so sad right now lol
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