Oh and the card information:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Tahiti PRO [Radeon HD 7950/8950 OEM / R9 280] (prog-if 00 [VGA controller])
        Subsystem: Hightech Information System Ltd. Device 2316
        Flags: bus master, fast devsel, latency 0, IRQ 47
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Memory at fbe00000 (64-bit, non-prefetchable) [size=256K]
        I/O ports at e000 [size=256]
        Expansion ROM at fbe40000 [disabled] [size=128K]
        Capabilities: [48] Vendor Specific Information: Len=08 <?>
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010
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        Capabilities: [150] Advanced Error Reporting
        Capabilities: [270] #19
        Capabilities: [2b0] Address Translation Service (ATS)
        Capabilities: [2c0] #13
        Capabilities: [2d0] #1b
        Kernel driver in use: radeon
        Kernel modules: radeon

02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Tahiti PRO [Radeon HD 7950/8950 OEM / R9 280] (prog-if 00 [VGA controller])
        Subsystem: Hightech Information System Ltd. Device 2316
        Flags: bus master, fast devsel, latency 0, IRQ 49
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Memory at fbd00000 (64-bit, non-prefetchable) [size=256K]
        I/O ports at d000 [size=256]
        Expansion ROM at fbd40000 [disabled] [size=128K]
        Capabilities: [48] Vendor Specific Information: Len=08 <?>
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010
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        Capabilities: [150] Advanced Error Reporting
        Capabilities: [270] #19
        Capabilities: [2b0] Address Translation Service (ATS)
        Capabilities: [2c0] #13
        Capabilities: [2d0] #1b
        Kernel driver in use: radeon
        Kernel modules: radeon