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60fps is always going to feel smoother than 45fps. In 66ms you’re getting around 4 frames while using 60fps but only 3 frames with 45 fps. This is good for games with a lot of motion, such as racing games.

However the input lag depends on the sync between the game and the monitor. The higher the monitor frequency, the sooner it “asks “ for a new frame. Having a higher frequency means it waits less time before asking for a new frame .

The max input lag is dictated by the monitor frequency. For example, a game that runs at 45fps (and has a frame time of 1s/45= 22ms) has a maximum input lag (the delay between the frame being ready and being displayed in the screen) of 11ms because the screen is checking for a new frame at 90Hz (1s/90=11ms)

Just went through the DF video again and here are the latency results for Doom Eternal specifically for 60 fps or lower.

Ranking wise:

OLED 60fps/60hz > LCD 60/60 = OLED 45/90 > OLED 40/80 > LCD 45/45 > LCD 40/40 = OLED 30/90 > LCD 30/60.

There is a 0.2ms difference between LCD 60/60 and OLED 45/90 and 0.3ms difference between LCD 40/40 and OLED 30/90.

Now, I did not play Doom Eternal specifically but I’ve been playing Batman: Arkham Knight on and off between 30 fps and 40 fps on the OLED and I have been wondering why 30 fps surprisingly feels pretty good.

If the input lag numbers for that game is in the general ballpark for the input latency differences for Doom Eternal, that does make sense.

It’s crazy that 30/90 on OLED feels as responsive as LCD 40/40 which has been long considered the “Golden 40”.

If you look at the numbers for their Crysis 3 Remastered, OLED 30/90 actually has a 10% input latency reduction over LCD 40/40.

I might just play 30/90 for all AAA games since it looks like at worst, it feels as good as the “Golden 40” of LCD Steam Deck but as is the case with Crysis 3 Remastered, OLED 30/90 actually feels better.

Ok, let’s talk frame times first:

1s / 90Hz = 11ms

1s / 60Hz = 16ms

1s / 45Hz = 22ms

Vsync introduces a lag between the frame being ready and being display in the screen. This means input lag is heavily dependent on the screen refresh rate, the higher the refresh rate, the lower the vsync lag. Then we need to add at least one frame time to the vsync lag, which is the minimum required for us to see the new frame. So it goes like this:

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The input lag between 60/60 and 90/45 is identical. Some game engines might work better with higher fps (they’re tie to game render frequency), so 60/60 has a slight advantage over 90/45 regarding input lag overall.

60/60 shows 4 frames in 66ms, but 90/45 only presents 3 frames, so 60/60 is smoother.

90/45 uses less battery and it’s generally more stable, as it gives more times for hiccups in the frame timing.

In conclusion: 60/60 is preferred in high pace/action games (like shooters or racing games), but 90/45 is better in slower pace games, specially open worlds with big variance in scenes (like RDR2 or Spider-man).