I need a 24"-27" monitor with decent 120hz strobing and no red KSF phosphor !

[alexander1986]

A while back I bought some asus 27" ips (forgot the model now) and I could not stand the red fringing when using ELMB, did some research and found out it is due to some red KSF phosphor thing!


was wondering how common is this today in 2025 is it being used in many new IPS monitors?

most of all I am looking for some tips on a cheap 24-27" monitor without this red KSF phosphor,
all I really need is good strobing at 120-144hz but preferrably a cheap monitor if possible !

if anyone got some tips and/or testufo screenshots from some monitor that would be very helpful,

thanks!

[Discorz]

XG2431 might suit your needs well. It's a valid option if you're looking for those specs. There is a new, detailed, multi-page review on Blur Busters website with pursuit photos, charts and all.

https://www.blurbusters.com/xg2431-discorz

Vast majority of new monitors use KSF/PFS backlights for wider color gamut. It is only recently that we're starting to see more QD backlight options that don't suffer from such artifacts. XG2431 uses neither of those, nor is the gamut particularly wide, but the strobing mode performs very well at lower refresh rates.

[kyube]

Disclaimer: if it's not here, it likely doesn't have a good backlight strobing implementation as of Q3 2025, YMMV with each one of these

The best backlight strobing modes are ones which have:
• YAG phosphor WLED backlight or QD-based WLED backlight
• Adjustable pulse width parameters (ideally in 2 decimal points and <1ms MPRT, but the former part is rare)
• Properly adjustable overdrive in steps of 0–100
• Retro 60Hz mode (rare, I personally avoid this due to severe light flicker)
• Bonus points if rolling scan

The good implementations are usually ones which employ ULMB (Nvidia-tuned), PureXP or DyAc (mostly due to the blurbusters utility)

Keep in mind that MPRT target is inversely proportional to the luminance output. This is where BenQ shines with their custom backlight solution.

A common bad practice, which frankly ruins backlight strobing, are custom implementations which implement a fixed duty cycle, which means that you require a higher vertical frequency (refresh rate) to achieve the best possible MPRT.

Here are the ones I've been able to find, made in the last decade:

FHD:
https://blurbusters.com/benq/strobe-utility/
Viewsonic XG2431 (great adjustability due to bb util & osd settings),
BENQ XL2540, XL2546, XL2566K (great due to bb utility),

360Hz G-SYNC Module ULMB models:
ASUS PG259QN(R),
Dell AW2521H,
MSI NXG253R,
Lenovo Y25G-30,
AOC AGON PRO AG254FG,
Viewsonic XG251G
Acer Predator X25
LG 25GR75FG

240Hz G-SYNC Module ULMB models:
(have pulse width adjustments)
OMEN X25,
Dell AW2518H,
Viewsonic XG2560,
MSI NXG252R, NXG251R,
ACER XB252Q, XN253QX,
(have no pulse width adjustments)
AOC AG251FG & ASUS PG258Q

I don't know how the new DyAc2 models (XL2546X+, XL2566X+, XL2586X, XL2586X+), which use rolling scan backlight strobing behave in terms of crosstalk & MPRT at lower refresh rates.

AOC AG246FK6's MBR+ (rolling scan backlight strobing) has a few steps to choose from (which I assume adjusts the pulse width)

ASUS PG248Q (older model)

MSI MAG251RX is also bearable, but inferior over the ones above, though I'll mention it.


QHD:
ULMB models such as:

24" QHD TN LCD 165Hz
(has pulse width adjustments)
Dell S2417DG
(have no pulse width adjustments)
Acer Predator XB241YU, AOC AGON AG241QG

27" QHD TN LCD 165Hz:
Lenovo Y27GQ-20 (don't know if KSF)

27" QHD IPS LCD 165Hz:
Dell S2716DG
Acer XB270HU, XB271HU
AOC AG273QG, AG273QCG
ASUS PG279QR
Viewsonic XG2703-GS, XG2760, XG270QG

27" QHD TN LCD 240Hz:
Lenovo Y27GQ-25 (likely KSF)

27" QHD IPS LCD 240Hz:
Viewsonic XG271QG (likely ksf)
Acer XB273U NX (don't know if QD or KSF)

27" QHD IPS LCD 360Hz:
ASUS PG27AQN(R) => KSF, but decent adjustability
(other ones such as Predator XB273U F5, AG276QZGD, )

Non-ULMB (custom):
AOC Q24G2A (bearable strobing ootb, limited adjustability)
MSI 274QRF-QD (bearable strobing ootb, limited adjustability)
GB FI32Q X (bearable strobing ootb, limited adjustability)
Cooler Master Tempest GP27Q
Gigabyte M27Q2 QD
Acer XB273U GX (only usable at 270Hz setting, fixed pulse width forces you to use highest vertical frequency to achieve lowest MPRT)


UHD
There are no ULMB or DyAc 4K models.
I'm relying on online review data only.
MSI 274URF-QD (QD), MPG321UR-QD
KTC M27P20 Pro
Benq EX3210U (QD)
Viewsonic XG320U
ASUS PG32UQ, XG32UQ


5K
The upcoming ACER XB323QX & it's clones (AOC is supposedly coming with one) are going to sport ULMB Pulsar, which will likely be tuned great.
Let's hope that it'll be a QD-based WLED backlight.

Taken from various sources online, such as:
https://www.nvidia.com/en-eu/geforce/pr ... ors/specs/
& online reviews by RTINGS, TFTCentral, MUB/HUB, a5hun, Bijan Jamshidi & many other sources.