Samsung UHD KU6400 vs Samsung UHD MU6400

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UHD KU6400 compared with UHD MU6400

	SamsungUHD KU6400	SamsungUHD MU6400
Overview
Released
Released	2016	March 2017
Display
Panel
Panel	LED LCD	LED LCD
Panel detail
Panel detail	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.	Flat LED-backlit LCD. FWD found a PLS panel in its 55-inch European review sample; that panel subtype is not assigned across other sizes.
Resolution
Resolution	3840 × 2160 (4K)	3840 × 2160 (4K)
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.	FWD measured 307 nits on its 55-inch European sample; no maker peak-brightness figure is assigned.
Picture processing
Picture processing	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 The maker's PQI 1500 and Motion Rate 100 labels are not native panel refresh rates; native Hz is left unpublished.	Active Crystal Colour, UHD Dimming, Contrast Enhancer and Auto Motion Plus. Samsung's PQI 1500 is a processing label rather than native Hz; unpublished native refresh is omitted.
Sizes
Sizes
Sizes	40, 43, 49, 55, 65″	40, 49, 55, 65″
Largest size
Largest size	65″	65″
Gaming
HDMI ports
HDMI ports	3 (0 HDMI 2.1 at 4K 120 Hz+)	3 (0 HDMI 2.1 at 4K 120 Hz+)
Variable refresh rate
Variable refresh rate	None	None
Auto low latency mode
Auto low latency mode	No	No
HDMI detail
HDMI detail	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.	Three HDMI inputs with ARC and HDMI-CEC; component/shared composite inputs also provided.
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.	21.3 ms in Game Mode on the 40-inch What Hi-Fi? sample; 17.7 ms in Game Mode and 91.1 ms in Film Mode on the 55-inch FWD sample.
Game features
Game features	Manual Game Mode; no variable refresh or automatic low-latency switching.	Manual Game Mode; no variable refresh or automatic low-latency switching.
Smart TV and sound
Smart TV platform
Smart TV platform	Tizen	Tizen
Processor
Processor	UHD Up-Scaling picture engine	UHD Up-Scaling picture engine; quad-core smart processor
Speakers
Speakers	20 W, 2.0 channels	20 W, 2.0 channels
eARC
eARC	No	No
Wi-Fi
Wi-Fi	Built-in Wi-Fi	Built-in Wi-Fi
Speaker detail
Speaker detail	Two-channel down-firing bass-reflex speakers with 20 W total output.	Two-channel down-firing bass-reflex speakers with 20 W total output.
Audio features
Audio features	Dolby Digital Plus, DTS, Multiroom Link, TV SoundConnect and Bluetooth headset support.	Dolby Digital Plus, DTS, Multiroom Link and Bluetooth audio.
Software updates
Software updates	Tizen smart TV platform; original app availability is not guaranteed today.	Tizen 3.0 in Samsung's developer model table. Samsung confirmed HDR10+ across its 2017 UHD lineup in December 2017; compatible firmware and content are required. Original app availability is not guaranteed today.
TV tuners
TV tuners	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.	DVB-T2/C/S2 digital and analogue tuners, with CI+ 1.3.
USB
USB	Two USB ports with media playback, recording and time shift.	Two USB ports with media playback, recording and time shift.
Ethernet
Ethernet	Ethernet LAN port.	Ethernet LAN port.
Optical audio out
Optical audio out	Optical digital audio output. Digital Foundry describes a headphone output, while Tweakers reports no 3.5 mm socket; no analogue headphone output is assigned.	Optical digital audio output; FWD found no 3.5 mm headphone socket on its 55-inch European unit.
Design and power
Size
Size	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.	Width × height × depth without stands, from the UK manual: 40-inch 903.7 × 519.8 × 54.2 mm; 49-inch 1099.4 × 638.7 × 54.8 mm; 55-inch 1235.2 × 715.1 × 54.8 mm; 65-inch 1456.1 × 840.4 × 54.5 mm. Configuration weights exclude stands.
Stand
Stand	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.	Fixed Y-shaped stand with no swivel. UK manual with-stand weights are 10.5, 16.0, 19.0 and 26.7 kg respectively; this overrides the online table's 10.6 and 28.3 kg for 40 and 65 inches.
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.	TM1750A Smart Remote and TM1240A standard remote for UK/Ireland, batteries, power cable, manual and analogue breakout cable.