So I completed my 1080p @ 120 FPS testing last night. I have listed below what does and doesn’t work as well as my recommendations for non-HDR PC gaming with the P75 with the latest beta firmware.
P75 HDMI Input 5
1. 1080p @ 120 FPS is a real 120 fps on HDMI 5. There is no doubling of frames and the UFO test site accurately recognizes that mode as 120 FPS.
2. The Chroma Subsampling setting is irrelevant for HDMI 5. HDMI 5 does not support 4K @ 60 FPS 4:4:4 with or without that setting turned on. Conversely to what most people think, the chroma subsampling setting does not affect HDR capabilities at all. It only affects whether the TV reports that it is 4K @ 60 FPS 4:4:4 capable in its EDID transmission. Chroma subsampling doesn’t effect HDR on any input. It only affects 4K @ 60 FPS 4:4:4 capabilities.
3. The 1080p @ 120 FPS video on HDMI 5 does not properly pass the 4:4:4 test. However, it doesn’t fail it completely either. That test is a very specific pattern that is designed specifically to only show the 4:4:4 text if it is a true 4:4:4 display with no other issues. If it is a 4:2:2 display then it will only show the 4:2:2 text if nothing else is wrong.
4. With 1080p @ 120 FPS video on HDMI 5 it clearly displays both the 4:2:2 and the 4:4:4 text. This is not an indication that it is a 4:2:2 display. Instead it is an indication that something else is wrong and you cannot draw a definitive conclusion on whether this display is 4:4:4 capable in that mode or not.
5. 1080p @ 120 FPS will only allow the 8 bit RGB setting as opposed to the YCbCr 4:4:4 setting. Both of those are true 4:4:4 though so it really is not relevant. It will allow you to select “limited” or “Full” range with RGB. I recommend “limited” unless you see issues in specific games or apps.
6. I absolutely guarantee that you will NEVER see any issues at all with how the P75 displays text with 1080p @ 120 FPS on HDMI 5 unless you are specifically trying to produce an issue by using the test patterns. In real world gaming, internet browsing, or even spreadsheets there are no issues at all. Text is completely clear. This is an ABSOLUTE non-issue.
7. I didn’t numerically measure the input lag on HDMI 5 with 1080p @ 120 FPS. I will leave that up to RTINGS.com to do that leg work. However, my observations were that GLL appears to help very little if at all with 1080p @ 120 FPS on HDMI 5. It appears to be extremely fast with GLL turned on or turned off.
8. The motion interpolation settings(Reduce Motion Blur and Reduce Judder) are greyed out with a 1080p @ 120 FPS input. Therefore they appear to be disabled. My supposition then is that the GLL setting isn’t really doing much with these settings disabled anyway.
9. With 1080p @ 120 FPS the motion handling appears to be very similar to 1080p @ 60 FPS with the motion interpolation turned up to 10. However, 1080p @ 120 FPS doesn’t have the input latency issues that 1080p @ 60 FPS has without GLL enabled. Therefore, I actually recommend turning GLL off with 1080p @ 120 FPS. This gives you excellent motion handling with nearly perfect input latency.
10. For the absolute best motion handling I have ever encountered you should use 1080p @ 120 FPS RGB on HDMI 5. Enable clear action which does not produce any flickering at all. Then disable Game Low latency. Test the ufo test site with this setup and I guarantee you will also see how good gaming can be. It is really disheartening that RTINGS.com simply refuses to acknowledge that this is the best that gaming can get. They are doing a disservice to their readers.
P75 HDMI Input 1-4
1. HDMI 1-4 will accept a 1080p @ 120 FPS input with or without chroma subsampling enabled. However, the screen can look all washed out or have chroma issues randomly. Sometimes restarting the display and unplugging the HDMI cable can help. However, it also sometimes requires toggling the chroma subsampling setting back and forth.
2. The Vizio settings app reports 1080p @ 120 FPS for a 1080p @ 120 FPS input. However, I was unable to get the UFO test site to recognize this as a 120 FPS display. It always displays it as 60 FPS with HDMI 1-4. I didn’t do the specific test for frame insertion. However, my best guess is that 1080p @ 120 FPS is not truly 120 FPS because of frame insertion on HDMI 1-4.
3. Input lag was atrocious on HDMI 1-4 with GLL disabled even with a 1080p @ 120 FPS input. Enabling GLL improved it but it still wasn’t what I consider to be “Good”.
4. Enabling chroma subsampling on HDMI 1-4 will allow the display to report that it is 4K @ 60 FPS 4:4:4 capable. If chroma subsampling is turned off then it will act just like HDMI 5 and max out at 4K @ 60 FPS 4:2:0. However, unlike HDMI 5, HDMI 1-4 will support HDR content. In addition the chroma subsampling setting does not effect HDR on HDMI 1-4 at all.
5. 4K @ 60 FPS 4:4:4 on HDMI 1-4 does not properly pass the 4:4:4 test or the 4:2:2 test. However, it will only be an issue with the test patterns. With all other real world content it will look just fine as long as you don’t have to cycle the power on the TV to get the chroma subsampling setting to “take properly”. RTINGS.com noted this issue in their review and it still exists today.
My biggest delima is how to get great 1080p @ 60 FPS gaming with the PS4, great PC gaming with 1080p @ 120 FPS, HDR gaming with both the PC and the PS4 at all resolutions, and how to get 4K @ 60 FPS 4:4:4 when I want that.
You have to have the PS4 going into HDMI 5 in order to get low input lag with 1080p @ 60 FPS and GLL enabled. However, you need HDMI 5 to do proper 1080p @ 120 FPS gaming with a PC.
On the other hand you must use HDMI input 1-4 to get HDR gaming at any resolution or frame rate. In addition you have to use HDMI 1-4 for 4K @ 60 FPS 4:4:4 but that also means you might encounter input lag and Clear Action flickering issues as well.
I haven’t achieved a setup that accomplishes all of those things yet. Right now I have both my PC and my PS4 going through my Yamaha receiver through one of its two HDMI outputs to HDMI 5 on the P75. This allows great non HDR PS4 and PC gaming at 1080p @ 60 FPS and 1080p @ 120 FPS respectively. However, my receiver will not pass 4K @ 60 FPS 4:4:4 properly even though it has the latest update and it advertises that it is 4K @ 60 FPS 4:4:4 capable.
I want to try an HDMI splitter like the one below. However, my fear is that it will only use the lowest resolution and chroma sampling of all of the devices that are connected to it.
What I really need is a 2 input or more HDMI splitter with 2 or more outputs that is HDR and 4K @ 60 FPS 4:4:4 capable. If anyone has some recommendations for that I am all ears.
Hopefully, this is helpful to everyone. Most of these things are not that unpresidented.