Problem with crossfire enabled

I just put in another ati 4850 and enabled crossfire. After clicking to open coh I get a bsod error saying "ati2dvag". Happens everytime. When I disable crossfire I can play coh fine. The obvious solution would be to keep crossfire disabled, and I probably will, BUT is this a problem with my ati cards, or coh? This is coh helper's post w/ crossfire disabled.

---System information gathered by CoH Helper version 0.1.1.8---

DxDiag gathered at August 4, 2009 23:35 (-05:00)
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_gdr.090206-1234)
System Manufacturer: Gigabyte Technology Co., Ltd.
System Model: EP45-UD3P
BIOS: Award Modular BIOS v6.00PG
Central Processor: Intel(R) Core(TM)2 Duo CPU E8500 @ 3.16GHz (2 CPUs)
Memory: 3070MB
.Net Memory Report: 2376MB out of 3070MB available
Page File: 4304MB (650MB currently in use)
C Drive: (WDC WD2500KS-00MJB0) 63637MB out of 238464MB (26%) free
D Drive: (ATAPI iHAS120 6) zero-size drive
E Drive: (NWJGRM HM3SLU38TMN SCSI CdRom Device) zero-size drive
G Drive: (NWJGRM HM3SLU38TMN SCSI CdRom Device) zero-size drive
F Drive: (NWJGRM HM3SLU38TMN SCSI CdRom Device) zero-size drive
H Drive: (NWJGRM HM3SLU38TMN SCSI CdRom Device) zero-size drive
Windows directory location: C:\windows
DirectX: DirectX 9.0c (4.09.0000.0904)
DirectX Diag version: 5.03.2600.5512 (32-bit version)

Display Notes: No problems found.
Sound Notes: No problems found.

No problems found.

No problems found.
Input Notes: No problems found.

Monitor: Plug and Play Monitor
Monitor's Max Resolution: 1600,1200
Video Device Name: ATI Radeon HD 4800 Series
Manufacturer / Chip: ATI Technologies Inc. / ATI Radeon Graphics Processor (0x9442)
Video Memory: 512.0 MB
Driver Version: 6.14.0010.6962
Driver Date: 5/15/2009 10:38:15 PM
Driver Language: English

Sound Device Description: Realtek HD Audio output
Driver File: RtkHDAud.sys
Driver Version: 5.10.0000.5672
Driver Date: 7/24/2008 5:02:44 AM

Sound Device Description: ATI HD Audio rear output
Driver File: AtiHdmi.sys
Driver Version: 5.00.40001.0009
Driver Date: 7/20/2007 6:40:10 PM

Sound Device Description: ATI HD Audio rear output
Driver File: AtiHdmi.sys
Driver Version: 5.00.40001.0009
Driver Date: 7/20/2007 6:40:10 PM


WMI Information
Motherboard Manufacturer: Gigabyte Technology Co., Ltd.
Motherboard Model: (empty)
Motherboard Product: EP45-UD3P
Motherboard Version: x.x
BIOS Manufacturer: Award Software International, Inc.
BIOS Name: Award Modular BIOS v6.00PG
BIOS Version: GBT - 42302e31
BIOS Release: 20080918000000.000000+000

Registry Information for Current User
Resolution: 1680x1050
3D Resolution: 1680x1050 (Not using renderscale)
Full Screen: Yes
Maximized: No
Screen Position: 0, 0
Refresh Rate: 60Hz
Vertical Sync Enabled: Yes

Physics Quality: Medium
Maximum Particles: 50000
Max Particle Fill? 10.000
Physics Card Enabled: No

Anti-aliasing: 4x
Anisotropic Filtering: 4x
Texture LOD Bias: Smooth
Water Effects: Low Quality
Bloom: 1.000 (turned on)
Depth of Field Enabled: No
Desaturation Effects (Sepia) Enabled: Yes
Shader Detail: Low (with world bumpmaps)

World Texture Level: Very High
Character Texture Level: Very High
World Detail Level (Vis_Scale): 1.000
Entity Detail Level: 1.000
Shadows Enabled: Yes
Gamma Correction: 1.000
Geometry Buffers (VBOs) Enabled: Yes
Suppression of Extra Player FX Enabled: No
Suppression of FX When Camera Close Enabled: Yes
Close Suppression Range: 3.000
Show Advertisements: Yes

Audio Mode: Performance
3D Audio: Yes
FX Sound Volume: 0.134
Music Sound Volume: 0.047

Show Advanced Graphics Options: Yes
Overall Graphics Quality: 0.600
Reverse Mouse Buttons: No
Save Login Username: Yes
Transfer Rate: 329351 bytes/second
Current Game Version: 19.20090702.5T2
Installation Directory: C:\Program Files\City of Heroes

Mod files in the Data directory
.\texture_library\GUI\Icons\Powers has 120 files
.\texture_library\MAPS\city has 1 file
.\texture_library\MAPS\Safeguard has 9 files
.\texture_library\MAPS\sewers has 44 files
.\texture_library\MAPS\static has 34 files
.\texture_library\V_MAPS\Outdoor_Missions has 9 files
.\texture_library\V_MAPS\Static has 16 files

Before the forum merge, I had a long discussion about CrossFire with an owner of a 4870 X2. It simply would not work at speed. I can only tell you to disable CrossFire for CoH.

Try it with another game, that's all I can tell you.