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PC graphics options explained

Gfx Test

Nvdia and AMD both offer tools to select the optimal graphics settings for the games you own, and both do a fine job balancing quality and performance. They really work pretty well, but I just like doing things myself. It's the PC gamer way, right? We tinker on our own terms.

If you're new to graphics tuning, this guide will explain the major settings you need to know about, and without getting too technical, what they're doing. Understanding how it all works can help with troubleshooting, setting up the most gorgeous screenshots possible, or playing with tools like Durante's GeDoSaTo. And I think a basic knowledge of the technology in our games makes us better at appreciating and critiquing them.

We start with the fundamental concepts on this page. For the sections on anti-aliasing, anisotropic filtering, and post-processing that follow, I consulted with Nicholas Vining, Gaslamp Games' technical director and lead programmer, as well as Cryptic Sea designer/programmer Alex Austin. I also received input from Nvidia regarding my explanation of texture filtering. Keep in mind that graphics rendering is much more complex than presented here. I'm a technology enthusiast translating these systems into simple analogies, not an engineer writing a technical paper, so I'm leaving out major details of actual implementation.

Resolution and FPS

A pixel is the most basic unit of a digital image—a tiny dot of color—and resolution is the number of pixel columns and pixel rows in an image or on your display. The most common display resolutions today are: 1280x720 (720p), 1920x1080 (1080p), 2560x1440 (1440p), and 3840 x 2160 (4K or ‘ultra-HD’). Those are 16x9 resolutions—if you have a display with a 16x10 aspect ratio, they’ll be slightly different: 1920×1200, 2560x1600, and so on.

Frames per second (FPS)

If you think of a game as a series of animation cells—still images representing single moments in time—the FPS is the number of images generated each second. It's not the same as the refresh rate, which is the number of times your display updates per second, and is measured in hertz (Hz). 1 Hz is one cycle per second, so the two measurements are easy to compare: a 60 Hz monitor updates 60 times per second, and a game running at 60 FPS should feed it new frames at the same rate.

The more work you make your graphics card do to render bigger, prettier frames, the lower your FPS will be. If the framerate is too low, frames will be repeated and it will become uncomfortable to view—an ugly, stuttering world. Competitive players seek out high framerates in an effort to reduce input lag, but at the expense of screen tearing (more on that below), while high-resolution early adopters may be satisfied with playable framerates at 1440p or 4K. The most common goal today is 1080p/60 FPS.

Because most games don't have a built-in benchmarking tool, the most important tool in your tweaking box is software that displays the current framerate. ShadowPlay or FRAPS work fine.

Upscaling and downsampling

Lately, I'm seeing a few games offer 'rendering resolution' settings—namely Ryse: Son of Rome and Shadow of Mordor. This setting lets you keep the display resolution the same (your display's native 1080p or 1440p, for instance) while adjusting the resolution of the game (but not the UI). If the rendering resolution is lower than your display resolution, it will be upscaled to fit—and, as expected, look like garbage.

If you render the game at a higher resolution than your display resolution, which is an option in Shadow of Mordor, the image will be downsampled (or 'downscaled') and will look much better—see 'supersampling' on the next page for more on that—at a high cost to performance.

Comparison Downscaling 2

Comparison Upscaling

Performance

Because it determines the number of pixels your GPU needs to render, resolution has the greatest effect on performance. This is why console games which run at 1080p often upscale from a lower rendering resolution—that way, they can handle fancy graphics effects while maintaining a smooth framerate.

I benchmarked the Shadow of Mordor resolutions above (all settings on maximum) on the Large Pixel Collider (specs here—two of its four GTX Titans active) to show how much resolution affects performance.

Shadow of Mordor resolution benchmarks (2x Nvidia GTX Titan SLI)

Avg. FPS Max FPS Min FPS
1980x720 (1/2 resolution)102
338
30
2560x1440 (native resolution)51
189
23
5120x2880 (2x resolution)16
26
10

Vertical sync and screen tearing

Tearing2 650

example of screen tearing

When a display's refresh cycle is out of sync with the game's rendering cycle, the screen can refresh just as the game has finished supplying a frame and started on another one. The effect is a ‘break’ called screen tearing, where we're seeing portions of two or more frames at the same time. It is also our number one enemy after low framerate.

One solution to screen tearing is vertical sync (vsync). It’s usually an option in the graphics settings, and it prevents the game from messing with the display until it completes its refresh cycle. Unfortunately, vsync causes its own problems, one being that it contributes to input lag when the game is running at a higher framerate than the display's refresh rate (this AnandTech article explains it in technical terms).

Adaptive Vertical Synchronization

The other big problem with vsync happens when the framerate drops below the refresh rate. If the framerate exceeds the refresh rate, vsync locks it to the refresh rate: 60FPS on a 60Hz display. That's fine, but if the framerate drops below the refresh rate, vsync forces it to jump to another synchronized value: 30 FPS, for instance. If the framerate fluctuates above and below the refresh rate often, it causes stuttering. We'd much rather allow the framerate to sit at 59 than punch it down even further every time it dips.

To solve this, Nvidia's Adaptive Vertical Synchronization disables vsync anytime your framerate dips below the refresh rate. It can be enabled in the Nvidia control panel and I recommend it if you're using vsync.

G-sync and FreeSync

New technology is starting to solve this big mess. The problem all stems from one thing: displays have a fixed refresh rate. But if the display's refresh rate could change with the framerate, we could eliminate screen tearing and eliminate the stuttering and input lag problems of vsync at the same time. Of course, you need a compatible video card and display for this to work, and there are two technologies now coming to market: Nvidia has branded their technology G-sync, while AMD's efforts are called Project FreeSync.

ABOUT THE AUTHOR

As Executive Editor, Tyler spends a lot of time editing reviews and looking at spreadsheets, and whatever time is left over writing reviews. People joke that he doesn't like 90 percent of the games he plays, but he'll tell you he just has very discerning tastes.

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