With the second BIOS loaded, the Devil 13 Dual GPU R9 290X manages to sustain its clock rate all the time. This is good news, as there are no performance penalties after sustained gaming, which is the case with the Crossfire of the two reference Single GPU R9 290X series cards.



Testbed:
- Motherboard: Intel DZ87KLT-75K
- CPU: Intel Core i7 4770K, 4x3.5GHz (Haswell)
- CPU Cooler: EVGA
- Memory: 2x4GB Corsair DDR3 2400MHz  
- Harddisk:   Corsair Neutron GTX 240GB
- Case: CoolerMaster Cosmos II
- Operating System: Win8.1 64-bit