Just so there's no ambiguity about this, I'm not advocating running this game at Low Detail. The flat, detail-deprived surfaces and poor lighting model at this level absolutely ruin the dark foreboding ambience and take away what makes this game special.
In addition, every card we tested was able to get very high frame rates at 1920 x 1200 with the Medium Detail setting, except with the most basic graphics card that we used for our tests, the Radeon HD 4650.
Just for reference, we benchmarked the Low Detail setting with the Radeon HD 4650 and compared it to the Medium Detail results:
Compared to the Medium Detail setting, the Low Detail setting looks like it lets us bump up from 1280x1024 to 1680x1050 and the minimum frame rate remains at about 30 frames per second (FPS). This sounds great, until you remember how it looks...
Given the choice, folks with slower graphics cards will probably want to opt for the lower resolution with Medium Detail enabled instead of a higher resolution at Low Detail.
The good news is that the next step up in our comparisons–the GeForce 9600 GT–will breeze through the Medium Detail setting at 1920x1200. Let's move on to the Medium Detail benchmarks.