When I first started generating CrossFire data (at the request of /u/Schmakk in /r/buildapc), my reaction was, "...the heck? How can a card that offers so much memory bandwidth and pixel fill rate fall behind the card it was faster than in single-GPU testing?" And then I started my clock rate log and everything made more sense. Beyond the possibility of performance being shader-bound, we know for a fact that two R9 290Xes in CrossFire throttle back their clock rate sooner and more severely than one board due to heat.

With that said, two $550 cards are still keeping pace with two $1000 boards in Arma III.

Even with two high-end cards, the Ultra detail preset is a bit much at 7680x1440. You'd probably want to scale back a bit if you own three 2560x1440 screens (incidentally, those 11 million pixels can be had for $1200 or so, which is almost one-third of an Ultra HD screen).

We record higher frame time variance from AMD's cards. The fact that its single- and multi-card solutions are on fairly event ground keeps us from suspecting an issue with CrossFire, though.
- Hawaii: A 6.2 Billion Transistor GPU For Gaming
- CrossFire: Farewell Bridge Connector; Hello DMA
- TrueAudio: Dedicated Resources For Sound Processing
- PowerTune: Balancing Performance And Acoustics
- Overclocking: PowerTune Changes Things
- The Radeon R9 290X
- Test System And Benchmarks
- Results: Arma III At 1920x1080 And 2560x1440
- Results: Arma III At 3840x2160
- Results: Battlefield 3 At 1920x1080 And 2560x1440
- Results: Battlefield 3 At 3840x2160
- Results: BioShock Infinite At 1920x1080 And 2560x1440
- Results: BioShock Infinite At 3840x2160
- Results: Crysis 3 At 1920x1080 And 2560x1440
- Results: Crysis 3 At 3840x2160
- Results: Metro: Last Light At 1920x1080 And 2560x1440
- Results: Metro: Last Light At 3840x2160
- Results: The Elder Scrolls V: Skyrim At 1920x1080 And 2560x1440
- Results: The Elder Scrolls V: Skyrim At 3840x2160
- Results: Tomb Raider At 1920x1080 And 2560x1440
- Results: Tomb Raider At 3840x2160
- CrossFire: Arma III At 7680x1440
- CrossFire: Battlefield 3 At 7680x1440
- CrossFire: BioShock Infinite At 7680x1440
- CrossFire: Crysis 3 At 7680x1440
- CrossFire: Metro: Last Light At 7680x1440
- CrossFire: The Elder Scrolls V: Skyrim At 7680x1440
- CrossFire: Tomb Raider At 7680x1440
- Power Consumption
- Noise
- CAD: AutoCAD 2013
- CAD: Autodesk Inventor 2013
- OpenGL: Maya 2013 And LightWave
- OpenCL: Bitmining, LuxMark, And RatGPU
- R9 290X: A Taste Of Paradise That Won’t Break The Bank
This is win-win-win for everyone (except maybe Nvidia).
Hope we never have to deal with a $1000 single GPU fiasco again. Good riddance.
- AMD: We're not aiming for the ultra high end.
I think Nvidia just got trolled.
- AMD: We're not aiming for the ultra high end.
I think Nvidia just got trolled.
Most of the higher resolution gaming wins come from the larger memory bandwidth and of course more vs the 780.
That's a good sign. Maybe NVidia will drop prices and push this to $400-$450 and I will pick one up when there is a Vapor-X version of course,
This is win-win-win for everyone (except maybe Nvidia).
Hope we never have to deal with a $1000 single GPU fiasco again. Good riddance.