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ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026) vs ROG Zephyrus M16 GU604 RTX 4080 (2023)

Asus ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026) vs Asus ROG Zephyrus M16 GU604 RTX 4080 (2023)

What ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026) does better (8) and where ROG Zephyrus M16 GU604 RTX 4080 (2023) wins (2) — every spec side by side.

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

9.4Score

8 advantages≈ $7,100

Asus ROG Zephyrus M16 GU604 RTX 4080 (2023)

Asus · 2023ROG Zephyrus M16 GU604 RTX 4080 (2023)

9.4Score

2 advantages≈ $6,800

Higher score

9.8Display9.3

7.8Memory & storage7.1

4.4Battery & portability9.2

9.8Features & cooling8.4

Dimensions

Size comparison

ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026)ROG Zephyrus M16 GU604 RTX 4080 (2023)

	ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026)	ROG Zephyrus M16 GU604 RTX 4080 (2023)	Difference
Depth	247 mm	246 mm	+1 mm
Width	355 mm	355 mm	=
Thickness	25 mm	23 mm	+2 mm
Weight	2.8 kg	2.3 kg	+0.5 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 ROG Zephyrus M16 GU604 RTX 4080 (2023)?

Brightness1,100 nits vs 500 nits2.2×
Video memory24 GB vs 12 GB2×
Resolution class3K (1800p/2000p) vs QHD (1440p/1600p)
Panel typeOLED vs IPS
GPU shader cores10,496 vs 7,424+41%
RAM typeLPDDR5X vs DDR5
Wi-Fi standardWi-Fi 7 vs Wi-Fi 6+17%
Bluetooth6 vs 5.2+15%

Why is ROG Zephyrus M16 GU604 RTX 4080 (2023) better than ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026)?

Weight2.82 kg vs 2.3 kg+23%
Thickness25 mm vs 23 mm+9%

Specifications

Side by side

Only differences	Asus ROG Zephyrus Duo 16 OLED GX651AX RTX 5090 (2026)≈ $7,1009.4	Asus ROG Zephyrus M16 GU604 RTX 4080 (2023)≈ $6,8009.4
Graphics
Graphics card	GeForce RTX 5090 Laptop	GeForce RTX 4080 Laptop
GPU maker	NVIDIA	NVIDIA
GPU power (TGP)	—	150 W
Video memory	24 GB	12 GB
Video memory type	GDDR7	GDDR6
GPU shader cores	10,496	7,424
GPU compute (FP32)	—	33.9 TFLOPS
3DMark Steel Nomad Light	—	21,090
Processor
Processor	Core Ultra 9 386H	Core i9-13900H
CPU maker	Intel	Intel
CPU cores	—	14
CPU threads	—	20
Max CPU clock	—	5.4 GHz
Processor options	—	Core i9-13900H
Geekbench 6 multi-core	—	15,617
Geekbench 6 single-core	—	2,821
Cinebench 2024 multi-core	—	754
Display
Screen size	16″	16″
Resolution	2880 × 1800	2560 × 1600
Resolution class	3K (1800p/2000p)	QHD (1440p/1600p)
Refresh rate	—	240 Hz
Panel type	OLED	IPS
Brightness	1,100 nits	500 nits
sRGB coverage	—	100%
Response time	—	3 ms
DCI-P3 coverage	—	100%
Pixel density	—	189 ppi
Aspect ratio	16:10	16:10
G-Sync / FreeSync	—	Yes
Advanced Optimus	—	No
MUX switch	—	Yes
HDR	—	Yes
Touchscreen	Yes	No
Memory & storage
RAM (up to)	64 GB	64 GB
RAM (base)	64 GB	64 GB
RAM type	LPDDR5X	DDR5
RAM speed	—	4,800 MHz
Max. supported RAM	—	64 GB
RAM slots	—	2
Upgradable RAM	—	Yes
SSD (up to)	2,000 GB	2,000 GB
SSD (base)	2,000 GB	2,000 GB
M.2 SSD slots	—	2
SSD interface	—	PCIe 4.0 x4
Battery & power
Battery capacity	90 Wh	90 Wh
Power adapter	250 W	280 W
USB-C charging (Power Delivery)	—	Yes
Design & cooling
Weight	2.82 kg	2.3 kg
Thickness	25 mm	23 mm
Width	355 mm	355 mm
Depth	247 mm	246 mm
Body material	—	Plastic
Colours	Grey	Black
Cooling fans	—	3
Vapor chamber cooling	—	No
Liquid metal (CPU)	—	Yes
Fan noise (max. load)	—	57.5 dB
Ports & wireless
Thunderbolt / USB4	Thunderbolt 4	Thunderbolt 4
Thunderbolt or USB4	Yes	Yes
USB-C ports	—	2
USB-A ports	—	2
HDMI	HDMI 2.1	HDMI 2.1
HDMI 2.1	Yes	Yes
(Mini) DisplayPort	—	No
Ethernet port	Yes	Yes
SD card reader	Yes	Yes
3.5 mm audio jack	Yes	Yes
Wi-Fi standard	Wi-Fi 7	Wi-Fi 6
Bluetooth	6	5.2
Keyboard & camera
Backlit keyboard	—	Yes
Numeric keypad	—	No
Key travel	—	1.7 mm
Webcam	1,080p	1,080p
IR camera (face login)	—	Yes
Fingerprint reader	—	No
Audio
Speakers	4 speakers	2 speakers
Dolby Atmos	Yes	Yes