SLI vs. CrossFire, Part 1 – mid-range multi-GPU scaling & value
Call of Juarez
Call of Juarez is one of the very earliest DX10 games. It is loosely based on Spaghetti Westerns that became popular in the early 1970s. Call of Juarez features its Chrome Engine using Shader Model 4 with DirectX 10. Our benchmark is built into Call of Juarez. It runs a simple flyby of a level that is created to showcase its DX10 effects. It offers good repeatability and it is a good stress test for DX10 features in graphics cards, although it is not quite the same as actual gameplay because the game logic and AI are stripped out of this demo.
Performing Call of Juarez benchmark is easy. You are presented with a simple menu to choose resolution, anti-aliasing, and two choices of shadow quality options. We set the shadow quality on “high” and the shadow map resolution to the maximum, 2048×2048. At the end of the run, the demo presents you with the minimum, maximum, and average frame rate, along with the option to quit or run the benchmark again. We always ran the benchmark at least a second time and recorded that generally higher score. Here are Call of Juarez DX10 benchmark results, first at 1920×1200 as there is no 2560×1600 option available in the benchmark:
Now we test at 1680×1050:
The GTX 580 takes the lead over the GTX 570 which edges the GTX 480. The overclocked GTX 460 matches the HD 5870. The GTX 560 Ti nearly catches the HD 6970 while convincingly beating the HD 6870 and the HD 6950. Although CrossFire scaling is nearly 100% for both Radeons, GTX 560 Ti SLI is still the fastest at this benchmark and it solidly beats the GTX 580.
I’m not 100% certain, but to analyze microstuttering, place a check in the box next to “Frametimes” in Fraps. Then when you press the hotkey, it will create a log file with a timestamp when each single frame was outputted. Only a few seconds is enough to make the log file really, really long. Then take a portion out of the log file and make a chart out of it, that measures the time between each timestamp, to see if the frames are consistent with each other in similar intervals, or if every other frame is too close to the other one.
If a game runs at say, 45fps with your SLI or CF setup, but feels more like 23-30fps, then definitely analyze this with FRAPS.
Great review so far.
How do the numbers change, if at all, if Split Frame Rendering is used instead of Alternate Frame Rendering?
The last time I used SLI was with my Voodoo2 3000s. It was a gigantic waste of $200, in 1996 dollars.
If SFR eliminates micro-stutter without too much of a performance penalty I might have to try SLI again.
why don’t they add BF:BC2?
and also 6950 n 6970 crossfire?
Concerning the microstutter, frames time (using that fraps option) is supposed to fluctuate more erratically on crossfire/sli than what it would be on a single card. I think instead of testing a moving scene, it would make more sense to test it on a completely still scene for a few seconds and see how they compare in the excel output file. You don’t want a moving scene because then you won’t be able to differentiate between the erracticness you would get from a moving scene and the erraticness you would get from microstutter.
Another interest option would be to downclock a sli/crossfire setup to a point where it matches the average framerate of the single card. This way you could could see if the multi-gpu setup looks choppier than a single card despite having the same average frame rate.
Excellent work! At the end, simple recommendations would have been nice. =)
Please include Civilization 5 if possible the next time you benchmark.
It is an important game which will test the tesselation feature and its scaling ability in multi-gpu configurations.
Civilization 5 has been added to my benching suite along with DiRT 3 and Total War, Shogun 2.
You’ve done a great job of benchmarking gaming performance, but including charts with FPS vs $$, and $$ vs wattage would be much more useful.
The wattage (both idle and load) figures can be especially important, as some of these cards can easily draw more juice than all but the most powerful (and expensive) power supplies can provide — and that definitely factors into the cost analysis.