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Crossfire Question

Tags:
  • Graphics Cards
  • AMD
  • Catalyst
  • Crossfire
  • Graphics
Last response: in Graphics & Displays
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a c 214 U Graphics card
December 30, 2011 7:07:49 PM

So I got my second 6870 for crossfire and I just wanted to be sure I get everything correct because I've never used a crossfire setup before.I see that on AMD's driver page they have AMD Catalyst Application Profiles.Do i need to install those to fully use crossfire or any need for them at all?

More about : crossfire question

a c 214 U Graphics card
December 30, 2011 11:11:27 PM

So i'm having a problem with MSI Afterburner.I can't set a custom fan setting for the 2nd card.Can you not do that?
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a c 181 U Graphics card
December 31, 2011 12:49:23 AM

purple stank said:
So i'm having a problem with MSI Afterburner.I can't set a custom fan setting for the 2nd card.Can you not do that?



No because your 1st card when the fan climbs your 2nd card will also. As to your first question if you are refering to as the same as the Nvidia controll panel. Yes you need it but I don't know a lot about crossfirex or the AMD/ATI cards. Sorry if I am not a big help. Good luck to you.
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a c 214 U Graphics card
December 31, 2011 1:39:47 AM

Oh okay.So the 2nd card is just a entire duplicate of the first card.So any settings you make for the first card will be duplicated to the 2nd.Alright gotcha.

Yah I'm still having some troube figuring the profiles out.I was playing BF3 before and I was only getting 40% usage from both cards.After installing the profile it boosted them to around 70% so it looks like it works somewhat.I'm still not seeing them both maxed out so that leads me to believe my processor is bottlnecking or I've also heard of 1GB of VRAM being a cause for performance loss in BF3.
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a b U Graphics card
December 31, 2011 2:27:08 AM

With Crossfire its always recommended to make sure you always have the latest CAP (crossfire application profiles) with out those tweaks some games run bad or have bugs in crossfire
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a b U Graphics card
December 31, 2011 2:32:24 AM

You will need/want CAP. Most games will work without them, but some won't work well.

As far as afterburner, I'd hold off on overclocking and even fan profiles until you're more used to your setup. You should be able to specify seperate settings for each card, but in my experience, it's not easy.
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a c 214 U Graphics card
December 31, 2011 2:55:51 AM

So you just download the CAP and that's it? It self-configure's?

I'm not planning on O.C.ing because the BIOS is locked on one of the cards and it's a reference cooler.Just gonna leave them at stock.

Onto my next question then,does anyone have any guess' as to why the cards are only seeing 70% usage in BF3? As a single card it was always 100% maxed but with crossfire they both hover around 70%.
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a b U Graphics card
December 31, 2011 2:19:19 PM

Check your CPU usage and GPU usage when running crossfire, any more than 85% CPU usage and a low GPU usage would indicate a CPU bottleneck, what CPU are you running?
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a c 214 U Graphics card
December 31, 2011 2:43:21 PM

I have a Phenom ii x4 965 @ 3.8ghz.CPU usage is about 95%.I was looking at the benchmarks and I haven't seen any difference between my CPU and say a 2600k.I believe BF3 just likes multi core CPU's not speed or arch.

It's strange though because I was in a server with only 10 people in it and both GPU's were maxed out and I was getting really good FPS.
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a b U Graphics card
December 31, 2011 3:06:44 PM

Install CAP and see if that helps. You don't need to do anything special. Just download, install, and restart.

For BF3, you can use the 12.1 preview driver too. There are supposed to be some performance tweaks that aren't in the release build.
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a c 214 U Graphics card
December 31, 2011 3:13:06 PM

I already have 11.12/CAP 1 installed.

One thing I have noticed though is that BF3 is using a lot more RAM than it used to,about 2GB more.My guess is that the 6870's don't have enough VRAM so it's digging into the virtual memory.
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a b U Graphics card
December 31, 2011 5:43:16 PM

purple stank said:
I already have 11.12/CAP 1 installed.

One thing I have noticed though is that BF3 is using a lot more RAM than it used to,about 2GB more.My guess is that the 6870's don't have enough VRAM so it's digging into the virtual memory.


I'm pretty sure it's not the VRAM. I have a similar GPU setup and my cards operate 100% in BF3. My total system RAM usage is about 4.5GB while playing.

Try these:
Catalyst 12.1 Preview
11.12 CAP 1

Run the uninstaller to delete the driver and profile off your system and reboot. Install the preview driver and reboot. Install the CAP and reboot.

Go into BF3 and use the recommended settings, but turn off motion blur and vsync (because they're stupid). See how it plays and what your GPU and CPU usage is at. Now turn down your settings one notch and see what your usage is at. Now turn up your settings one notch above recommended and see what your usage is at. This will give you an idea of what your computer is doing.
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a c 214 U Graphics card
December 31, 2011 6:39:02 PM

When you playing what is your processor's average usage percentage in the task manager?

Mine is 95%.
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a c 214 U Graphics card
December 31, 2011 7:02:05 PM

Well I tried your suggestion but it didn't seem to work.Still topping out at 60% on each card.I'm really thinking it's a CPU bottleneck but I still don't know yet.I know that AMD released a patch back in Oct. that greatly increased crossfire specificly for BF3 so it's not like it's not optimized already.
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a b U Graphics card
December 31, 2011 10:00:16 PM

purple stank said:
Well I tried your suggestion but it didn't seem to work.Still topping out at 60% on each card.I'm really thinking it's a CPU bottleneck but I still don't know yet.I know that AMD released a patch back in Oct. that greatly increased crossfire specificly for BF3 so it's not like it's not optimized already.



If your CPU is at 95%, but your cards are only at 60%, that means your CPU is limiting you. As always, kill any processes you don't need. But you can probably turn UP your settings and see the same framerate if your GPUs aren't being fully utilized.

Edit: What resolution are you playing at?
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a c 214 U Graphics card
December 31, 2011 10:48:41 PM

1600x900.

Yah I tried the method of settings you suggested before and it seems that whenever I increase it to Ultra the GPU usage either stays the same or declines.Decreasing the settings to low or medium brought increased GPU utilization.So I think it's safe to say it's either the VRAM or the processor causing a bottleneck instead of a Crossfire bug or driver related.

But what's troubling is that from this review of CPU utilization in BF3 my Phenom ii x4 965 looks more like a dual core.The 980 is only at 70%.

http://www.techspot.com/review/458-battlefield-3-perfor...
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a b U Graphics card
January 1, 2012 1:36:03 AM

purple stank said:
1600x900.

Yah I tried the method of settings you suggested before and it seems that whenever I increase it to Ultra the GPU usage either stays the same or declines.Decreasing the settings to low or medium brought increased GPU utilization.So I think it's safe to say it's either the VRAM or the processor causing a bottleneck instead of a Crossfire bug or driver related.

But what's troubling is that from this review of CPU utilization in BF3 my Phenom ii x4 965 looks more like a dual core.The 980 is only at 70%.

http://www.techspot.com/review/458-battlefield-3-perfor...


You're not going to be able to run BF3 at ultra. And it's not the VRAM holding you back.

If medium gives you the best results, play at medium. It's as simple as that.
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a c 214 U Graphics card
January 1, 2012 5:21:16 PM

What settings do you play at?

What is your CPU usage at when you play?
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a b U Graphics card
January 1, 2012 10:37:42 PM

I play on a mix of high and medium settings with 2xMSAA at 1920x1200. Playing today, my CPU usage was +90%. Both GPUs were ~100%.
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a c 214 U Graphics card
January 1, 2012 11:04:21 PM

What would your GPU usage be like if you used high settings with the same A/A and A/F?
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a b U Graphics card
January 1, 2012 11:32:35 PM

purple stank said:
What would your GPU usage be like if you used high settings with the same A/A and A/F?


The same. I'd just get less FPS.
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a c 214 U Graphics card
January 1, 2012 11:57:31 PM

Hmm.I think it's 2 reasons why mine are only at 60%.One is because of my processor casing a bottleneck and the second I guess would have to be that the drivers aren't fully optimized for 6870's yet.
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a c 214 U Graphics card
January 15, 2012 11:42:59 AM

Do I have to download a CAP release for each game or does the latest release of the CAP apply to every previous game?
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