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Anyone still running dual 4870x2's? Could you test something?

Jun 16, 2009
251 (0.08/day)
Processor Intel Core i7 2500K @ 5GHz 1.4v
Motherboard Asrock Z77E-ITX
Cooling Corsair H60 with 2 x 120mm push/pull exhaust, 140mm intake
Memory 8GB Samsung 30nm DDR3 1600 @ 2133 9-10-10-20-1t 1.45v
Video Card(s) Asus Geforce 480 GTX w/low idle voltage BIOS
Storage 128GB Plextor M3P SSD, 3 x 2TB Hitachi 5400rpm in RAID0
Display(s) 2x eMachines 22" 1080p LCDs
Case Lian Li Q08A Mini-ITX
Audio Device(s) Onboard
Power Supply Corsair AX750 80Plus Gold
Software Windows 7 Ultimate x64
I've got a dual 4870x2 setup and can't get Just Cause 2 to use all 4 gpus when in CrossfireX mode. With the latest Catalyst driver (really, any Catalyst after 10.5), this game only uses 3 of 4 gpus as evidenced by the MSI Afterburner's OSD. The 4th gpu just sits at it's 2D clock settings the whole time and the usage never goes above 0%. Does anyone else have a similar setup to test? I'm pretty sure it's a driver issue, but I'd like to be sure. Forcing a Crossfire method (AFR, etc...) with RadeonPro doesn't work either. The game is pretty much unplayable for me with the latest drivers, but I really don't want to switch to old drivers for just one game...

If someone with newer dual gpu cards (5970, 6970) in Crossfire could test this as well, that would be great. I suspect it will work just fine on the newer cards and this is just another example of Ati kicking previous gpu generations to the curb.