Conclusion

First of all, let us talk about prices. For the sake of argument, let us consider that the two Radeon R9 270 graphics cards cost 336 Euro and compare that to the 369 Euro you would have to pay for the cheapest reference Radeon R9 290X we can find. Therefore, this one high-end card is is going to be 9 percent more expensive than the two mid-range cards.  

To dive a bit deeper into the results, we start with performance differences in 3DMark graphics score where we see that the CrossFire of the two R9 270 is about a percent faster than the Radeon R9 290X in case of the graphics score. In the next theoretical test we ran, Unigine Heaven, we see that the two R9 270 graphics cards are, on average, 32 percent slower than the 290X. In case of games it turns out that, for example in Skyrim, a single Radeon R9 290X card is about 47 percent faster than the two R9 270 graphics cards in CrossFire. A closer look at the Call of Duty: Black Ops 2 shows the other end of the scale, where the two R9 270 score 12 percent better than the single Radeon R9 290X.

Overall the two R9 270 graphics cards are performing really well on average, while in the end, the R9 290X is still 9.2 percent faster than two R9 270 in CrossFire. The bigger problem is that the average value is not even telling half the story. It turns out that in one of the games we tested, the single card was faster, but then, there are games where the difference is small and, last but not least, there are some titles where the two R9 270 cards are a lot faster. This in the end makes the performance rather unpredictable. This comparison is becoming most interesting when having a close look at power consumption. In idle, the power consumption of our test system is 26 percent higher with two R9 270 compared to one R9 290X and under load conditions the story changes, as the single Radeon R9 290X graphics card  burns 31 percent more power than two Radeon R9 270 graphics cards. So basically the CrossFire setup under load burns about 30 percent less power but is just about 9 percent slower.

Page 1 - Introduction	Page 10 - Far Cry 3
Page 2 - Test Setup	Page 11 - Sleeping Dogs
Page 3 - 3DMark Fire Strike	Page 12 - The Elder Scrolls V: Skyrim
Page 4 - Unigine Heaven 4.0	Page 13 - Metro: Last Light
Page 5 - BattleField 3	Page 14 - GTA V
Page 6 - Bioshock Infinite	Page 15 - Power Consumption
Page 7 - Crysis 3	Page 16 - Performance Index, price
Page 8 - Call of Duty Black Ops 2	Page 17 - Conclusion
Page 9 - DIRT Showdown