Samsung OLED S90H vs Samsung UHD KU6400

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OLED S90H compared with UHD KU6400

	SamsungOLED S90H	SamsungUHD KU6400
Overview
Released
Released	May 2026	2016
Display
Panel
Panel	OLED (42, 48, 55, 65, 83″), QD-OLED (77″)	LED LCD
Panel detail
Panel detail	WOLED (LG Display); the 77-inch is QD-OLED	Flat LCD with LED backlight; VA panel on the 40-inch Digital Foundry and Tweakers review units. Panel type is not assigned to the other sizes.
Resolution
Resolution	3840 × 2160 (4K)	3840 × 2160 (4K)
Refresh rate
Refresh rate	165 Hz	–
HDR formats
HDR formats	HDR10, HDR10+, HLG	HDR10
Peak brightness
Peak brightness	–	Digital Foundry measured 400 nits peak brightness on its 40-inch sample; Tweakers measured 380 cd/m² at maximum backlight on its 40-inch sample. These are review measurements, not maker ratings.
HDR extras
HDR extras	HDR10+ Adaptive, HDR10+ Gaming and HDR10+ Advanced	–
Screen finish
Screen finish	Glare Free	–
Picture processing
Picture processing	4K AI Upscaling Pro, AI Motion Enhancer Pro, Real Depth Enhancer, Auto HDR Remastering Pro, Color Booster Pro, HDR Brightness Optimizer, AI Optimized / AI Customization	Active Crystal Colour, UHD Dimming, Contrast Enhancer and Auto Motion Plus. The maker's PQI 1500 and Motion Rate 100 labels are not native panel refresh rates; native Hz is left unpublished.
Picture modes
Picture modes	Filmmaker Mode, EyeComfort Mode; Smart Calibration (Basic)	–
Motion handling
Motion handling	Motion Xcelerator 165 Hz	–
Viewing angle
Viewing angle	Ultra Viewing Angle	–
Sizes
Sizes
Sizes	42, 48, 55, 65, 77, 83″	40, 43, 49, 55, 65″
Largest size
Largest size	83″ (better)	65″
Gaming
HDMI ports
HDMI ports	4 (all HDMI 2.1 at 4K 120 Hz+) (better)	3 (0 HDMI 2.1 at 4K 120 Hz+)
Variable refresh rate
Variable refresh rate	HDMI VRR, FreeSync Premium, G-Sync Compatible	None
Auto low latency mode
Auto low latency mode	Yes	No
HDMI detail
HDMI detail	4K 165 Hz on HDMI 1/2/3/4; eARC; Anynet+ (HDMI-CEC)	Three HDMI inputs with ARC and HDMI-CEC. Tweakers confirmed HDMI 2.0 and 4K 60 Hz PC input on its 40-inch European sample; enable HDMI UHD Color for full chroma text reproduction.
Input lag
Input lag	–	21 ms in Game Mode on the 40-inch Tweakers sample. Digital Foundry lists 21 ms in its specifications table but 19 ms in its text; the conflicting figures are not combined.
Game features
Game features	FreeSync Premium Pro on 48–83″ (FreeSync Premium on 42″); Game Motion Plus, Dynamic Black EQ, Super Ultra Wide Game View, Game Bar, Mini Map Zoom, Surround Sound, HGiG, AI Auto Game Mode, AI Gaming Optimizer	Manual Game Mode; no variable refresh or automatic low-latency switching.
Cloud gaming
Cloud gaming	Samsung Gaming Hub	–
Smart TV and sound
Smart TV platform
Smart TV platform	Tizen	Tizen
Processor
Processor	NQ4 AI Gen3 Processor	UHD Up-Scaling picture engine
Speakers
Speakers	–	20 W, 2.0 channels
Dolby Atmos
Dolby Atmos	Yes	–
eARC
eARC	Yes	No
Wi-Fi
Wi-Fi	Wi-Fi 6E	Built-in Wi-Fi
Bluetooth
Bluetooth	5.3	–
Speaker detail
Speaker detail	42″ 20 W, 2ch; 48–83″ 40 W, 2.1ch; Object Tracking Sound Lite	Two-channel down-firing bass-reflex speakers with 20 W total output.
Audio features
Audio features	Q-Symphony, Active Voice Amplifier Pro, Adaptive Sound Pro, AI Sound Controller Pro, 360 Audio, Audio Pre-selection Descriptor	Dolby Digital Plus, DTS, Multiroom Link, TV SoundConnect and Bluetooth headset support.
Voice assistants
Voice assistants	Bixby and Alexa built in, with far-field voice; works with Alexa and Google Assistant speakers	–
Casting
Casting	Apple AirPlay, Google Cast, screen and sound mirroring from Samsung phones	–
Software updates
Software updates	Security updates until at least 31 December 2031	Tizen smart TV platform; original app availability is not guaranteed today.
TV tuners
TV tuners	DVB-T2/C/S2 and analogue; CI+ 1.4 slot; HbbTV 2.0.4	Samsung's UK API lists DVB-T2 for 40 inches and DVB-T2/C/S2 for the larger sizes. Its regional app and tuner entries differ, so satellite support is not assumed for the 40-inch model.
USB
USB	2 × USB-A	Two USB ports with media playback, recording and time shift.
Ethernet
Ethernet	1 × LAN	Ethernet LAN port.
Optical audio out
Optical audio out	1 × optical	Optical digital audio output. Digital Foundry describes a headphone output, while Tweakers reports no 3.5 mm socket; no analogue headphone output is assigned.
Design and power
Size
Size	Without stand, 42″ 934.4 × 542.6 × 39.5 mm; 48″ 1069.3 × 619.9 × 39.6 mm; 55″ 1225.4 × 708.6 × 39.9 mm; 65″ 1444.3 × 831.7 × 39.9 mm; 77″ 1718.5 × 987.6 × 44.9 mm; 83″ 1851.0 × 1062.8 × 44.9 mm	Width × height × depth without stands, from the UK manual: 40-inch 905.7 × 520.6 × 54.6 mm; 43-inch 968.8 × 565.2 × 55.4 mm; 49-inch 1101.4 × 639.7 × 55.2 mm; 55-inch 1237.2 × 716.1 × 55.2 mm; 65-inch 1458.1 × 841.4 × 54.9 mm. Configuration weights exclude stands.
Stand
Stand	42″ Simple Blade; 48–83″ Simple Plus Blade (Laser Slim design)	Fixed stand with no swivel. The UK manual overrides conflicting online table dimensions for 40 inches and with-stand height/depth for 55 inches. With-stand weights are 11.5, 12.7, 17.1, 19.6 and 26.8 kg respectively.
In the box
In the box	–	Samsung Smart Remote, batteries, power cable, manual and analogue breakout cable; additional remote wording varies by size in the maker tables.
VESA pattern
VESA pattern	42″ 200 × 200 mm; 48–65″ 300 × 200 mm; 77″ and 83″ 400 × 300 mm	–
Power use
Power use	Typical/max, 42″ 52/195 W; 48″ 62/230 W; 55″ 76/380 W; 65″ 85/510 W; 77″ 112/660 W; 83″ 128/740 W; 0.5 W standby	–
Energy class
Energy class	42″ G; 48″ G; 55″ F; 65″ E; 77″ E; 83″ F	–
Colours
Colours	Graphite Black	–