C24FG70 Quality Control

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    Could i ask you about freesync range of c24fg70? Is it right that with 70-144 Hz of freesync range, minimal effective range of adaptive-sync is 35 fps with low framerate compensation? Is it possible that with fps <35 there will be tripling of refresh rate? (with 34 fps monitor will have 102 Hz).
    For me, when the monitor is on 144 Hz, I cant see any difference with or without freesync enabled. (Also cant detect any tearing with vsync off even while variable fps <60)


    LFC doesn’t just work by doubling frame rate, it works by multiplying it by an appropriate value. So yes, it can work below 35fps. But the experience at such low frame rates is truly horrific regardless.


    I’d like to tell about my observation of flickering. While playing quantum break with freesync i’ve spotted flickers. After this i checked freesync demo Freesync Demo
    With ultimate engine there is a constant flickering on the other hand with standard engine flickers is absent. (But this demo runs at 60 fps only so if the range of c24fg70 is 90-144 on standard, i suppose freesync just doesnt work, but programm thinks opposite). These poor feature implementation + annoying purple trail make this monitor really so so ): . Also I’ve been able to spot flickers at the bottom of the monitor as you mentioned in your article. (using test pattern checkbox)
    I’m experiencing exactly the same trouble with flickering in the same spot as in this video.
    Freesync Ultimate engine flickers
    Also I’ve checked it with standard engine and there’s no flickering.
    So i tried witcher 3 with low settings and rivatuner 120 fps lock
    ultimate engine: 120 fps and frequent(faster than with 60 fps) flickers
    standard engine 120 fps and no flickers.


    Given the issues highlighted in this thread and the fact the extent of overshoot trailing seems to vary, even with relatively new revisions, the monitor has been removed from the recommendations section for now. I’d still urge people to give it a go if they can purchase from somewhere with a good returns policy, as they’ve got nothing to lose but time that way and this is still a unique monitor.


    Thank you for all of your replies, I stick with this monitor despite of all shit happening. I’ve seen some negative replies about freesync flickering on such expensive models as benq xl2730z and even gsync on aoc g2460pg. At least there’s no other non-TN 144Hz panels under 400$ for me.


    Well that’s the thing, it’s still a very unique product despite its shortcomings. And all monitors have some shortcomings. I hope you will get some good enjoyment out of it.


    How do you think, does this type of flickering has negative impact on health? I’d like to know should I avoid playing with freesync in this situation when the flickers are visible(Looks like freesync always leads to flickering its just more noticeable in some cases).


    It could only have such an impact if you had photosensitive epilepsy and were sensive to that (fairly low) frequency of flicker. Otherwise it’s nothing to worry about, it’s more of a nuisance than anything.


    Recently i’ve learned about eizo foris fg2421. It has strobe backlight feature, flickering on 240 Hz.
    Have you heard something about pulse width (especially max hz of backlight flickering) of impulsive scanning feature and do you know any ways to determine these numbers at home without very expensive equipment (connect oscilloscope somehow?) ?


    Erm. If you think the C24FG70 has quality control issues, just wait until you get or read deeper into the FG2421. It is clearly explained in the review that the strobe frequency matches the refresh rate on the C24FG70. That is the normal way of doing things, the EIZO is an exception. And don’t confuse PWM and strobing, they’re quite separate tgings.


    Thank you for your answer, i’ve just missed one more thing from articles again, my mistake. From this article i’ve learned a term called “Ultra Low Motion Blur Pulse Width” which means that pulse width is not necessary related with PWM, but looks like it’s bad idea to use this term to other strobe-technologies.


    Yes that is confusing, as the ‘Pulse Width’ can indeed be adjusted for ULMB (Ultra Low Motion Blur). But ‘PWM’ is a specific form of backlight brightness regulation. The flickering is very different in nature to that caused by ULMB, where the backlight pulses on and off completely at a frequency matching the refresh rate at which the display is set.


    What do you think about flickering absence on Asus PG297Q in this video, this guy has turned strobe feature on on both monitors while presenting witcher 3. As you said ulmb and samsung’s impulsive scanning work on basic refresh rate of the monitor. I cant understand why camera in this video is not able to capture flickers on asus while its strobe works on the same refresh rate as samsung’s strobe. May be it is caused by 4-way segmented backlight of c24fg70?


    ‘Impulsive scanning’ refreshes the screen from top to bottom, whereas ULMB strobes the entire backlight on and off at the same time. The effect to our eyes is the same, but if a camera is filtering out flickering as is done there then it could certainly misrepresent things.


    I went ahead and returned my screen; just got the replacement in, this time with a Gamma of 2.21 and Greyscale Calibration of 3.65. Is this..better? Previous monitor had a gamma of 2.03 and Greyscale Calibration of 1.91.

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