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ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026) vs Legion 5 15 RTX 5070 (2025)

Asus ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026) vs Lenovo Legion 5 15 RTX 5070 (2025)

What ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026) does better (15) and where Legion 5 15 RTX 5070 (2025) wins (2) — every spec side by side.

Asus · 2026ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026)

9.4Score

15 advantages≈ $7,200

Higher score

Lenovo · 2025Legion 5 15 RTX 5070 (2025)

8.7Score

2 advantages≈ $1,850

9.8Display9.1

7.9Memory & storage4.6

4.4Battery & portability9.1

9.8Features & cooling7.3

Dimensions

Size comparison

ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026)Legion 5 15 RTX 5070 (2025)

	ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026)	Legion 5 15 RTX 5070 (2025)	Difference
Depth	247 mm	255.3 mm	−8.3 mm
Width	355 mm	344.9 mm	+10.1 mm
Thickness	25 mm	21.5 mm	+3.5 mm
Weight	2.8 kg	2.2 kg	+0.6 kg

Drawn to the same scale from the official dimensions (front and side).

Why is ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026) better than Legion 5 15 RTX 5070 (2025)?

RAM (up to)64 GB vs 32 GB2×
Video memory24 GB vs 8 GB3×
GPU shader cores10,496 vs 4,6082.3×
Brightness1,100 nits vs 500 nits2.2×
Resolution class3K (1800p/2000p) vs QHD (1440p/1600p)
SSD (up to)2,000 GB vs 1,000 GB2×
Battery capacity90 Wh vs 80 Wh+12%
RAM (base)64 GB vs 16 GB4×
RAM typeLPDDR5X vs DDR5
SSD (base)2,000 GB vs 1,000 GB2×
SD card readerYes · Legion 5 15 RTX 5070 (2025): No
Dolby AtmosYes · Legion 5 15 RTX 5070 (2025): No

Why is Legion 5 15 RTX 5070 (2025) better than ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026)?

Weight2.82 kg vs 2.2 kg+28%
Thickness25 mm vs 21.5 mm+16%

Specifications

Side by side

Only differences	Asus ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026)≈ $7,2009.4	Lenovo Legion 5 15 RTX 5070 (2025)≈ $1,8508.7
Graphics
Graphics card	GeForce RTX 5090 Laptop	GeForce RTX 5070 Laptop
GPU maker	NVIDIA	NVIDIA
GPU power (TGP)	—	115 W
Video memory	24 GB	8 GB
Video memory type	GDDR7	GDDR7
GPU shader cores	10,496	4,608
GPU compute (FP32)	—	26.2 TFLOPS
3DMark Steel Nomad Light	—	14,047
Processor
Processor	Core Ultra 9 386H	Core Ultra 7 255HX
CPU maker	Intel	Intel
CPU cores	—	14
Max CPU clock	—	4.9 GHz
Processor options	—	Core i7-13650HX, Core i7-14700HX, Core Ultra 7 251HX, Core Ultra 7 255HX
Display
Screen size	16″	15.1″
Resolution	2880 × 1800	2560 × 1600
Resolution class	3K (1800p/2000p)	QHD (1440p/1600p)
Refresh rate	—	165 Hz
Panel type	OLED	OLED
Brightness	1,100 nits	500 nits
sRGB coverage	—	100%
Pixel density	—	150 ppi
Aspect ratio	16:10	16:10
G-Sync / FreeSync	—	Yes
Advanced Optimus	—	Yes
MUX switch	—	Yes
HDR	—	No
Touchscreen	Yes	No
Memory & storage
RAM (up to)	64 GB	32 GB
RAM (base)	64 GB	16 GB
RAM type	LPDDR5X	DDR5
RAM speed	—	5,600 MHz
Max. supported RAM	—	64 GB
RAM slots	—	2
Upgradable RAM	—	Yes
SSD (up to)	2,000 GB	1,000 GB
SSD (base)	2,000 GB	1,000 GB
M.2 SSD slots	—	2
SSD interface	—	PCIe 4.0 x4
Battery & power
Battery capacity	90 Wh	80 Wh
Power adapter	250 W	245 W
USB-C charging (Power Delivery)	—	Yes
USB-C charging power	—	100 W
Design & cooling
Weight	2.82 kg	2.2 kg
Thickness	25 mm	21.5 mm
Width	355 mm	344.9 mm
Depth	247 mm	255.3 mm
Body material	—	Aluminium, Plastic
Colours	Grey	Black
Cooling fans	—	2
Vapor chamber cooling	—	No
Liquid metal (CPU)	—	No
Fan noise (max. load)	—	66.7 dB
Ports & wireless
Thunderbolt / USB4	Thunderbolt 4	Thunderbolt 4
Thunderbolt or USB4	Yes	Yes
USB-C ports	—	2
USB-A ports	—	3
HDMI	HDMI 2.1	HDMI 2.1
HDMI 2.1	Yes	Yes
(Mini) DisplayPort	—	No
Ethernet port	Yes	Yes
SD card reader	Yes	No
3.5 mm audio jack	Yes	Yes
Wi-Fi standard	Wi-Fi 7	Wi-Fi 7
Bluetooth	6	5.4
Keyboard & camera
Backlit keyboard	—	Yes
Numeric keypad	—	Yes
Key travel	—	1.6 mm
Webcam	1,080p	720p
IR camera (face login)	—	No
Fingerprint reader	—	No
Audio
Speakers	4 speakers	2.0
Dolby Atmos	Yes	No