Topic Title: Please Help!!!! BF3 FPS dropped with HD6850 crossfire enables
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Created On: 08/01/2013 01:08 PM
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 08/01/2013 01:08 PM
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John Bauer
Peon

Posts: 1
Joined: 08/01/2013

I am so disappointed that disabling the crossfire gives better performance in Battlefield 3, it appears to be the only game I bought to have troubles while crossfire enables with my 2 x HD6850. I have tried many Catalyst Drivers with/without CAPs (even the latest 13.8 beta) and still no improves. I hope someone here can help!!! Please!!! My system details are shown below

Graphics Card

2 x XFX HD685X-ZCFC Core: 775Mhz, Mem: 1000Mhz

AMD Catalyst Driver Version, and Driver History

13.8 Beta (Currently Using)

13.6 Beta2, 13.4, 13.1

Operating System

Windows 8 Pro

Issue Details

Battlefield 3 FPS dropped when crossfire enables

Each GPU only uses 30% of core capability

20-30 fps even in low graphic settings.....

Disabling crossfire gives 60fps in Med or High settings

Motherboard or System Make & Model

Gigabyte P55-USB3

Power Supply

Sliver Power SP-SS650 650W

Display Device(s) and Connection(s) Used

Philips 244E1SB (HDMI) 1920x1080 60Hz

Applications and Games

Battlefield 3

CPU Details

Intel i5 750 x4 core 2.67Ghz

System Memory Type & Amount

OCZ Obsidian 2 x 2GB DDR3 1600


 08/12/2013 03:13 PM
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George@AMD
Nerfed

Posts: 52
Joined: 09/10/2012

In looking at your motherboard specs you have 1 PCIE X 16 running at X16 speeds and one PCIE X16 running at x4 speeds. When you enable crossfire X the video cards need to run at a common speed in order to work together. In your current system build the common speed would be x4 which is bottle necking the primary card. That is why you are getting better performance with one video card than two.

 http://www.gigabyte.com/products/product-page.aspx?pid=3311#sp

 If you wish to get better performance with crossfire x enabled you should find a motherboard with Dual x8 speeds or for best performance Dual x16 speeds PCIE expansion slots.



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 08/12/2013 10:05 PM
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black_zion
Nanotechnology Guru

Posts: 11617
Joined: 04/17/2008

As well you could stand to have a faster processor, a 2.67ghz i5 is not exactly a quick thing these days.

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