AMD's Radeon R9 295X2 is an impressive piece of engineering. AMD managed the seemingly impossible: to cram two fully unlocked, fully clocked Hawaii GPUs onto a single graphics card. AMD's ace is the watercooling solution from Asetek, which, despite being relatively compact with just a 1x 120 mm radiator, can handle the heat both GPUs put out quite well.
In terms of performance, we see truly impressive 4K resolution numbers from that are essentially twice those of a single R9 290X card. With these results, the R9 295X2 is the fastest single card solution available today, and a great choice for this resolution and 5760x1080 EyeFinity. Thanks to the low temperatures provided by watercooling, the card does not throttle during normal games, which leaves its full potential at your fingertips at all times. Yet unlike a single GPU card based on two graphics processors, the R9 295X2 needs good drivers to show proper performance improvements in games, and AMD's updated driver support produced better CrossFire scaling across our test suite than ever before. The only game that does not scale properly is Diablo 3: Reaper of Souls, which marks a significant improvement over the last time we looked at CrossFire with the HD 7990, where six out of eighteen games did not scale as expected. It still shows that you may be left with single GPU (R9 290X) performance when a new title comes out for which CrossFire support is not available immediately. Also, at lower resolutions, 2560x1600 and below, scaling is slim in general, and I would not recommend the R9 295X2 or any other multi-GPU solution for those setups. A powerful single-GPU solution, like NVIDIA's GeForce GTX 780 Ti or Titan, will definitely do better at 2560x1600 while being more cost efficient.
