Frametime Analysis

We present a more in-depth analysis than just average FPS to show how the framerate changes over time, which helps highlight FPS drops. Minimum FPS at both the 95th and 99th percentile are reported in these charts, too. A second chart, a histogram, shows shape and spread for the frametime data—how tightly grouped the measurements are. The "IQR" result is called "Interquartile Range," which is an outlier-resistant statistical value that tells us the range in the middle of the frametime distribution.

In the following charts, we are comparing two retail memory kits. The sub-timings are based on the individual XMP and EXPO profiles and are not adjusted further. By doing so, these charts represent a direct comparison between 7200 MT/s and 6000 MT/s.

Tests are conducted with the following components:
CPU: AMD Ryzen 9 7950X (Locked All-Core 5.2 GHz)
GPU: PNY GeForce RTX 4090 XLR8 VERTO
Memory (1): G.SKILL DDR5-6000 F5-6000J3038F16GX2-TZ5N (30-38-38-96) - 1:1 Ratio
Memory (2): Trident Z5 RGB DDR5-7200 (48 GB) F5-7200J3646F24GX2-TZ5RS (36-46-46-115) - 2:1 Ratio




Comparing both of these memory kits with low graphical settings helps to illustrate how sensitive AMD is to memory frequency and overall timings. It can affect the average frame-rate and the 1% lows. Because 7200 MT/s requires the memory controller to run at half speed, 6000 MT/s pulls far ahead, even though it is technically inferior on paper.




Increase the graphical settings, and the same scenario plays out. Due to the increase in latency of running the 7200 MT/s memory kit in a 2:1 ratio to the CPU memory controller, 6000 MT/s is still quite far ahead with a 13 FPS lead in the 1% lows.




Raising the game's resolution in Cyberpunk 2077 to 4K means the game becomes completely GPU bound, leaving the CPU often waiting on the graphics card to finish each calculation. With a margin of error of 3%, these two memory kits are indistinguishable at this resolution using an RTX 4090.