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AMD 6900 Crossfire Support

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  • Neova


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Posted 06 January 2011 - 07:05 PM

I had upgrade to 2x unlocked 6950s in CF mode using the newer 10.12a RC3 drivers. In GTA and EFLC with CFX on, my average FPS is ~ 30 at max settings (all sliders at 100), highest everything.

cpu core i5 - 760 @ 4.2 GHZ
8 GB system ram
6950 CFX

Range fluctuates from less than 10 (spin the mouse around on a new area) to 120+ FPS but average is fairly low.

With a single card, I can actually average 60 FPS in most driving conditions!

Any tips on how to improve my minimum FPS without disabling CFX? I got the second card mainly to use it with enbseries.

How about you SLI guys? Do you have huge minimum fps drops?

A single 6950 unlocked is about 50% than my old 465 GTX but I would like to have more average performance.

Maybe switch to an older driver? Has anyone thoroughly tested older drivers with the 6900 series?

  • RadioActiveLobster

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Posted 06 January 2011 - 10:29 PM

I am having the same issues.

i7-950 @ 3.6GHZ
12 GB DDR3
6950 CFX Unlocked

Using the 10.12a drivers. I can't even get the game to run without using the "-norestrictions -nomemrestrict" command lines because the game forces 800x600 and doesn't allow any changes due to what seems to be a driver bug

  • OverTheBelow

    OTB "Oaty-Bee"

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Posted 06 January 2011 - 11:31 PM

Could be that they are still optimizing crossfirex with these cards. Perhaps wait for this month's ATI driver release before applying ENB, etc?

  • mkey82

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Posted 07 January 2011 - 03:00 AM

GTAIV does not benefit from CF/SLI. Full stop. Drivers will not fix that, GTAIV is badly made.

  • Neova


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Posted 07 January 2011 - 06:40 AM

This is without ENB.

With enb in GTA4, I get ~ 25 - 30 FPs also , but the FPS swings between single digit (4 was the lowest I saw) up to 40ish or so.

I know enb and / or GTA is using the two cards (it is on 100% load) but the minimum frames are terrible. I hope it is a new architecture / driver maturity issue thats why I asked if other ATI CFX or SLI users have the same issue.

1 video card probably will not give me what I was hoping for, especially with ENB on. Would love to have 40-60 FPS sustained with all settings maxed out.

  • Neova


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Posted 16 January 2011 - 06:06 PM

Update - it is a CFX issue. If I turn off CFX, GTA 4 and EFLC can detect the card correctly and performance is 20-30 FPS average.

Hopefully AMD/ATI will fix it in the next driver release for 6900 series as 4,5 and even 6800 series owners do not seem to have CFX issues.

Lastly for enbseries users, drop draw distance to ~ 30 to help with overall FPS and set everything else at max, even with ENB.

  • Girish


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Posted 16 January 2011 - 06:11 PM

QUOTE (Neova @ Jan 16 2011, 23:36)
Update - it is a CFX issue.

I highly doubt it. If you've tried other games, you'll notice that they work fine with SLI or CrossFire. GTA IV is not optimized to run with SLI/CFX enabled. Unless Rockstar release a patch to specifically fix this, no driver update is going to help you.

  • Neova


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Posted 17 January 2011 - 02:04 PM

That is what I wrote. My performance issues are CFX related, for GTA 4, with 6900 series and the current and ONLY driver for it. I didn't specify other issues but there are... such as bad opengl performance and compatibility in other games.

Or that GTA VC cannot detect my CFX setup but single card works, or that GTA SA cannot be set beyond 800x600 with or without CFX.

So currently for us 6900 owners, we have less issues if we disable CFX for GTA games until AMD fixes their drivers.

  • Stinky12

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Posted 17 January 2011 - 02:37 PM

GTA IV is a poorly ported game, don't even bother using this as a reference to your hardware's performance.
Use better games to see how well it perform like with Metro 2033, Dirt 2, or SC2.
@OP exactly at what resolution are you running at?

  • Neova


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Posted 18 January 2011 - 07:00 AM

@ stinky12, You're right GTA should be used as the sole metric but I was only talking about GTA 4 / EFLC here.

The 2x 6950 in CFX mode plays DX10/DX11 games faster than a 580 GTX for only 10% more money. Metro 2033, Stalker, Mafia II all my Steam Source games from Valve, AvP 2010, BF2:BC ... no issues all at max settings that I can set.

But I'm a big GTA fan and still play GTA3, VC, SA, 4 and EFLC and in these games... well performance is underwhelming vs the newer games. It seems like the current drivers has lot of issues with DX9 and OpenGL games. Single card fixes some of the DX9 issues and opengl is just plain broken. I cannot run Doom3 even with the latest patches... and it has been confirmed the drivers does not have extension limits which would have fixed the opengl issues. Next driver hopefully.

My system: Core i5-760 Quadcore @ 4.2 GHZ, 8 GB system ram, 2x 6950 CFX unlocked, 1920x1080p LCD TV monitor. Most other games run at 8xAA maxed out with no issues.

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