DiRT: Showdown
Racing to the front of our 2013 list will be our racing benchmark, DiRT: Showdown. DiRT: Showdown is based on the latest iteration of Codemasters’ EGO engine, which has continually evolved over the years to add more advanced rendering features. It was one of the first games to implement tessellation, and also one of the first games to implement a DirectCompute based forward-rendering compatible lighting system. At the same time as Codemasters is by far the most prevalent PC racing developers, it’s also a good proxy for some of the other racing games on the market like F1 and GRID.
DiRT: Showdown is something of a divisive game for benchmarking. The game’s advanced lighting system, while not developed by AMD, does implement a lot of the key concepts they popularized with their Leo forward lighting tech demo. As a result performance with that lighting system turned on has been known to greatly favor AMD cards. With that said, since we’re looking at high-end cards there’s really little reason not to be testing with it turned on since even a slow card can keep up. That said, this is why we also test DiRT with advanced lighting both on and off starting at 1920x1080 Ultra.
The end result is perhaps unsurprising in that NVIDIA already starts with a large deficit with the GTX 680 versus AMD’s Radeon cards. Titan closes the gap and is enough to surpass the 7970GE at every resolution except 5760, but just barely. This is the one game like this and as a result I don’t put a ton of stock into these results on a global level, but I thought it would make for an interesting look none the less.
This also settles some speculation of whether DiRT and its compute-heavy lighting system would benefit from the compute performance improvements Titan brings to the table. The answer to that is yes, but only by roughly as much as the increase in theoretical compute performance over GTX 680. We’re not seeing any kind of performance increase that could be attributed to improved compute efficiency here, which is why Titan can only just beat the 7970GE at 2560 here. However the jury is still out on whether this means that DiRT’s lighting algorithm doesn’t map well to Kepler period, or if it’s an implementation issue. We also saw some unexpected weak DirectCompute performance out of Titan with our SystemCompute benchmark, so this may be further evidence that DirectCompute isn’t currently taking full advantage of everything Titan offers.
In any case, at 2560 Titan is roughly 47% faster than the GTX 680 and all of 3% faster than the 7970GE. It’s enough to get Titan above the 60fps mark here, but at 5760 no single GPU, not even GK110, can get you 60fps. On the other hand, the equivalent AMD dual-GPU products, the 7970GECF and the 7990, have no such trouble. Dual-GPU cards will consistently win, but generally not like this.
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