ASUS Zenbook DUO (UX8407) vs Lenovo ThinkPad T420

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Zenbook DUO (UX8407) compared with ThinkPad T420

	ASUSZenbook DUO (UX8407)	LenovoThinkPad T420
Overview
Released
Released	February 2026	March 2011
Display
Screen size
Screen size	14″	14″
Resolution
Resolution	2880 × 1800 (better)	1366 × 768 or 1600 × 900
Panel
Panel	OLED	–
Refresh rate
Refresh rate	144 Hz	–
Brightness
Brightness	500 nits (better)	200 nits or 250 nits
HDR peak brightness
HDR peak brightness	1,000 nits	–
Touchscreen
Touchscreen	Yes	No
Display type
Display type	Two 14-inch 3K ASUS Lumina Pro OLED touch screens, 16:10, stylus support	14-inch 1366 × 768 (200 nits) or 1600 × 900 (250 nits) LED-backlit LCD; 300:1 contrast
Colour range
Colour range	100% DCI-P3	–
Screen finish
Screen finish	Anti-reflection coating (65% less reflection)	Anti-glare
Display features
Display features	0.2 ms response; 1,000,000:1 contrast; VESA DisplayHDR True Black 1000; 1.07 billion colours; PANTONE Validated; 93% screen-to-body ratio; E-Reading mode	–
Performance
Processor
Processor	Intel Core Ultra 9 386H, Intel Core Ultra X9 378H or Intel Core Ultra X9 388H	Intel Core i5-2520M
CPU cores
CPU cores	16	2
CPU threads
CPU threads	16	4
Graphics
Graphics	Intel Graphics or Intel Arc B390 GPU	Intel HD Graphics 3000 or NVIDIA NVS 4200M
AI engine (NPU)
AI engine (NPU)	50 TOPS	–
Memory
Memory	32 GB (better)	4 GB
Storage
Storage	1 TB to 2 TB (better)	128 GB to 500 GB
CPU
CPU	Core Ultra X9 388H or 378H, Core Ultra X7 358H or Core Ultra 9 386H with 4 P-cores, 8 E-cores and 4 LP E-cores (18 MB cache); Core Ultra 7 355 with 4 P-cores and 4 LP E-cores (12 MB cache)	Second-generation Intel Core i3, i5 and i7 dual-core processors; QM67 chipset
GPU
GPU	Intel Arc B390 GPU (Core Ultra X7 and X9) or Intel Graphics, integrated	Integrated Intel HD Graphics 3000; optional NVIDIA NVS 4200M with 1 GB and Optimus
AI engine
AI engine	Copilot+ PC; Intel NPU up to 50 TOPS	–
Memory type
Memory type	LPDDR5X on board, 16 or 32 GB, not upgradable	DDR3-1333; two SO-DIMM sockets, up to 8 GB
Storage type
Storage type	One M.2 2280 PCIe 4.0 x4 slot; 512 GB, 1 TB or 2 TB NVMe SSD	Removable 2.5-inch SATA HDD or SSD; removable Ultrabay Enhanced DVD burner; optional second drive adapter
Battery and size
Battery life (maker's claim)
Battery life (maker's claim)	Up to 32 hours	Up to 9 hours
Battery capacity
Battery capacity	99 Wh (better)	57 Wh
Weight
Weight	1.65 kg (better)	2.2 kg
Thickness
Thickness	23.4 mm (better)	30.5 mm
Width × depth
Width × depth	310.1 × 208.6 mm	340.5 × 233 mm
Battery life detail
Battery life detail	99 Wh, 4-cell Li-ion; 1080p video up to 32 hr (one screen) or 18 hr (two screens); web browsing up to 18 hr (one screen) or 12 hr (two screens); ASUS test at 150 nits and 60 Hz	MobileMark 2007: integrated graphics, six-cell 57 Wh up to 9 hours, nine-cell 94 Wh up to 15 hours, nine-cell plus slice up to 30 hours; Optimus up to 8.8 / 14.7 / 29.5 hours; four-cell option; weight shown with six-cell battery
Charger
Charger	100 W USB-C adapter; not included in every country	65 W; 90 W on Optimus models
Fast charging
Fast charging	60% in 49 minutes	–
Materials
Materials	Ceraluminum chassis, hinge and kickstand; MIL-STD-810H tested	Carbon-fibre/glass-fibre hybrid display cover; carbon-fibre reinforced plastic bottom; magnesium roll cage
Colours
Colours	Moher Gray	Black
Connections
Ports
Ports	2 × Thunderbolt 4, USB-A, HDMI, headphone jack	4 × USB-A, Ethernet, SD card slot, headphone jack
Wi-Fi
Wi-Fi	Wi-Fi 7	802.11b/g/n or 802.11a/b/g/n
Bluetooth
Bluetooth	5.4	Optional Bluetooth 3.0
Webcam
Webcam	FHD with IR	Optional 720p
Operating system
Operating system	Windows	Windows
Port detail
Port detail	2 × Thunderbolt 4 (40 Gbps, display and power delivery); USB-A 10 Gbps; HDMI 2.1 FRL; 3.5 mm combo audio jack	Three USB 2.0 (one powered), one USB 2.0/eSATA combo, VGA, DisplayPort, Gigabit Ethernet, audio combo, 4-in-1 SD reader and ExpressCard/34; optional modem, FireWire and smart card reader
External displays
External displays	Two 4K 60 Hz or one 8K 60 Hz over Thunderbolt 4	Up to 2560 × 1600 at 60 Hz via DisplayPort; 2048 × 1536 at 75 Hz via VGA; Optimus variants support three independent displays
Keyboard
Keyboard	Detachable Bluetooth keyboard, backlit, 1.7 mm key travel, Copilot key; attaches magnetically to the lower screen with pogo pins	Seven-row spill-resistant keyboard; TrackPoint; ThinkLight overhead illumination
Trackpad
Trackpad	ErgoSense precision touchpad on the keyboard	UltraNav multi-touch touchpad
Speakers
Speakers	Six speakers with dedicated tweeters and woofers, Smart Amp	1 W × 2 stereo speakers
Microphones
Microphones	Array microphone	Dual-array microphone
Biometrics
Biometrics	IR camera for Windows Hello	Optional swipe fingerprint reader; TPM 1.2
In the box
In the box	ASUS Pen with wireless charger in some countries	–