GeForce GTX 970 SLI review

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FCAT Frame Experience Analysis Tomb Raider

We will look on the following pages into Frame Experience Analysis with a benchmark technology called FCAT. Basically with the charts shown we are trying to show you graphics anomalies like stutters and glitches in a plotted chart. Lately there has been a new measurement introduced, latency measurements. Basically it is the opposite of FPS.

  • FPS mostly measures performance, the number of frames rendered per passing second.
  • Frametime aka Frame Experience recordings mostly measures and exposes anomalies - here we look at how long it takes to render one frame. Measure that chronologically and you can see anomalies like peaks and dips in a plotted chart, indicating something could be off. 
Frame time
in milliseconds
8.3 120
15 66
20 50
25 40
30 33
50 20
70 14

We have a detailed article (read here) on the new FCAT methodology used, and it also explains why we do not use FRAPS anymore.

Frametime - Basically the time it takes to render one frame can be monitored and tagged with a number, this is latency. One frame can take say 17ms. Higher latency can indicate a slow framerate, and weird latency spikes indicate a stutter, jitter, twitches basically anomalies that are visible on your monitor.

What Do These Measurements Show?

Basically, what these measurements show are anomalies like small glitches and stutters that you can sometimes (and please do read that well, sometimes) see on screen. Below I like to run through a couple of titles with you. Mind you that Average FPS matters more than frametime measurements. It's just an additional page or two of information that from now on we'll be serving you.

Tomb Raider Frame Experience Analysis


Above a percentile chart of the 30 seconds @ 2560x1440. Here we plot FPS and place it in relation to percentiles. This methodology could be used to determine average FPS as well.

Check the 50% marker:

  • GTX 970 SLI does roughly 150 FPS on average in this scene sequence

This is actually spot on with the previous recorded scores. But now lets look at frame latency.


Above are four cards tested at a monitor resolution of 2560x1440 (QHD). You'll notice that here frametime scaling in milliseconds is higher for the slower cards, and lower for the fast cards. Low latency means a graphics card can squeeze more frames into one second.

SLI card performance wise there are no stutters recorded, BUT there is good and bad news, the bad news is that you can see a lot of framedrops. This issue continued persistently through all FCAT results. We are still investigating what is going on there. These are not stutters, frame-drops at 6 to 8 ms like these can not be seen with your eyes (that's the good news).

With this chart, lower = better. Huge spikes above 40ms - 50ms can be considered a problem or indicate a low framerate. Spikes that drop down can be considered to be dropped frames.

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