Samsung - CF791 Series 34" impressions

Discussion in 'Displays' started by valkrien, Jan 22, 2017.

  1. valkrien

    valkrien Limp Gawd

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    Just got this monitor to replace my Samsung S34E790C 34"

    Initial thoughts:
    Zero dead pixels
    No light bleed
    Quantum Dot tech really does make the colors much more vibrant
    White is much more true to life white vs. slightly grey / yellow hue on the S34E790C
    Text is sharper (the other monitor uses slightly rectangle pixels)
    Less ghosting from bright/dark in comparison
    100hz is great

    I'm using a gtx1080 so not sure about freesync but 100hz with adaptive sync is fantastic

    Overall, a very nice, albeit expensive, upgrade
     
  2. l88bastard

    l88bastard 2[H]4U

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    Love mine too :)

    Like it much better than my old X34.
     
  3. linuxdude9

    linuxdude9 Gawd

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    Freesync flicker problems though...
     
  4. l88bastard

    l88bastard 2[H]4U

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  5. ziocomposite

    ziocomposite n00b

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    Which GPU do you have? For games like Witcher 3/Rise of the Tomb Raider which push/fluctuate fps how does the monitor fair in regards to stutter/tearing. Which mode of vsync do you use if any?
     
  6. valkrien

    valkrien Limp Gawd

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    I have an Nvidia gtx 1080. I pretty much always use the adaptive sync option in the control panel. To be honest, I had a gsync monitor and its not a huge difference in my opinion. I frequent the witcher 3...and let me tell you, this monitor is SO nice. Very little tearing at all with adaptive sync
     
  7. supastar1568

    supastar1568 Limp Gawd

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    Thanks for the insights OP. I've been interested in this monitor but love my Nvidia card and g-sync on my 27" Acer IPS, so I'm happy to hear that adaptive v-sync does the trick for you.

    The Asus and Acer 34" have g-sync of course, but I've been turned off by their build quality (went thru 6 Acer XB270HU before finding a decent one, still has 2 dead pixesl though).
     
  8. xSneak

    xSneak Limp Gawd

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    How bad is the ghosting? I'm seeing mixed answers on that issue. This guy on youtube said it was too much for him so he got a pg348q.
     
  9. criccio

    criccio Fully Equipped

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    This was the only other option for me over the PG348Q but, since I never had G-SYNC before, I went with the Asus. I'm really happy with it so far but I'm also glad to know that not having G-SYNC isn't as much of a problem as I thought it would be.
     
  10. cmacclel

    cmacclel Limp Gawd

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    I had both the Sammy and Asus side by side on my desk and wound up keeping the Asus. The Sammy looks like a 32" compared to the Asus as the curve makes the screen look smaller. At the time both cost me $999 it was a hard choice but I chose to live with a little BLB but have G-Sync.
     
  11. valkrien

    valkrien Limp Gawd

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    The blur is not noticeable to me at all really. I ran the same test and did not have it as bad as that video. MUCH better than that prior Samsung curved that I had
     
  12. geok1ng

    geok1ng 2[H]4U

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    The 24fg70 has a scanning full array local dimming backlight, for the theoretically optimal motion blur of all TFTs ever made. But i am still trying to find if the larger cousin CF791 received such a gift.
     
  13. Vega

    Vega [H]ardness Supreme

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    It's a shame it's only 1080p. Are they going to make a 1440p version? I'd be interested if that was the case. 1080p monitors need to die.
     
  14. geok1ng

    geok1ng 2[H]4U

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    YES. CH711
    2560x1440 at 27 and 32". Like the CF791, no one knows if they will have a scanning FALD. The CFG70 has one, but such ground breaking feature was not clear on the press releases leaked last year.
     
  15. Vega

    Vega [H]ardness Supreme

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    Oh nice, I would be interested if it has a scanning back-light. I assume these Samsungs while scanning can do more than the ~120 nits that ULMB tops out at? That's the largest reason I don't use it.
     
  16. geok1ng

    geok1ng 2[H]4U

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    http://www.expertreviews.co.uk/sams...g-gaming-monitor-with-top-notch-image-quality

    However, it should be noted that if you intend to play games on the monitor and keep the response time to a minimum, the monitor’s brightness level falls to around 250cd/m2.

    A scanning FALD is the state of art blur motion control feature precisely because of this: in a classical strobing backlight the entire screen goes dark. in a scanning FALD, only a small portion of the screens is dark at any time.
     
  17. geok1ng

    geok1ng 2[H]4U

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    Blurbusters haveinfo on the so called "advanced motion blur":

    From the luminance curves I have seen, it looks rather like 3 segments, maybe it will be 4 with the 27". And the pulse pattern looks the same when frame rates drop (FreeSync), except for the additional gaps caused by delayed frames which stay dark. Obviously, this gives rise to annoying flicker, but FreeSync can be used without backlight strobing, so they say. Source: German computer journal c't.

    BTW, is that you Vega, talking about this feature there?

    Comparing the Manuals, i can safely conclude that the CF791 does not have LMB like the FG70

    Samsung press release at CES also mentioned the nirvana, a 4k quantum dot with LMB in both 28 and 32" variants:

    The 28-inch UH750 monitor combines Samsung’s gamer-friendly features with an ultrafast 1 m/s response time, Quantum Dot picture display and high-quality UHD resolution, all housed within a slim, narrow-bezel design.

    So it either has a new control board like Cirthix"s one ( which i doubt) or they somehow found a way to use a scanning FALD on a 60Hz signal .

    they are milking gamers, selling the '1080p FALD, then the 1440p FALD and leaving the 4k FALD for later. :mad:
     
  18. Phelptwan

    Phelptwan [H]ardness Supreme

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    Any chance you can do me a favor and measure it from side to side? I have a closet exactly 32" wide that I'm planning on buying one to stick in and I've seen two different width measurements advertised.
     
  19. Vega

    Vega [H]ardness Supreme

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    250 nits is much more acceptable. That is over twice the brightness of current ULMB displays. I like using my computer in a bright room during the day, looking out the windows etc. Helps keep my eyes from getting tired.

    Where did you read that this screen has FALD? You can do scanning with edge lit.
     
  20. geok1ng

    geok1ng 2[H]4U

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    i am curious about this idea, because the reason why edge lit works in the first place is that the light scatters around the entire screen thanks to a mirror surface behind the screen, so unless some zoning is happening, turning off a part of the edge lit will not work. In anotehr thread i proposed ELZD: edge-lit zone-dimming.
     
  21. Vega

    Vega [H]ardness Supreme

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    It's basically the way edge-lit local dimming works.

    https://www.google.com/patents/US8860655

    https://www.cnet.com/news/led-local-dimming-explained/

    I'm 99% positive these Samsung monitors are simply edge lit. FALD is expensive and these monitors are pretty cheap.
     
  22. geok1ng

    geok1ng 2[H]4U

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    Thank you very much for the link. Both of us were havimng the right idea: edge-lit is not optimal for local dimming and FALD is too expensive. quoting the article:

    Edge-lit local dimming
    The most common variety is local dimming on edge-lit LED LCDs. With edge-lit LCDs, all the LEDs are along the edge of the TV, facing the center of the screen.

    Local dimming, in this case, becomes a little looser of a term. Worst-case, "local" could be nearly invisible dimming, or dimming huge swaths of the screen at a time, offering little benefit, or, in some cases, a worse picture

    CFG70 behavior is consistent with sides edge-lit ou top and bottom edge-lit.

    Time to look for CFG70 disassembly pictures
     
  23. Vega

    Vega [H]ardness Supreme

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    Ya, that is why I am so interested in the new 144 Hz 4K FALD monitors coming out. Really revolutionary in the PC monitor market.
     
  24. geok1ng

    geok1ng 2[H]4U

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    C34F791 review is out.

    Comparing against the AOC AG352UCG:

    Samsung's has higher color gamut, but in the simulated sRGB mode, only covers 94% of sRGB. The AOC has lower color gamut, but covers 100%. Overall the Samsung offers more tight out of the box color fidelity.

    Samsung's Lag is 1.5 frames at 100Hz, AOC's about half a frame.

    Blur on Samsung is even worst than AOC

    Freesync does not adjust overdrive settings over the refresh rate range, making the GSync experience on the AOC better.

    Samsung has Active Area 799.8(H)×334.8(V) mm. I have not found specs sizes on the AOC, but AUO 35" tipically measure 819.84(W)×345.87(H) mm.

    As they cost about the same, Bigger in this case is better. Unlike the C24FG70, which is likely the best monitor at its price/size, the C34F791 was not another quantum dot win for samsung.