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Asus VivoBook 15 (X1504) 15.6" Intel Core i7-1255U 1.7GHz / 8GB RAM / 512GB SSD specifications and in-depth review

Asus VivoBook 15 (X1504) 15.6" Intel Core i7-1255U 1.7GHz / 8GB RAM / 512GB SSD

Manufacturer: Asus

The Asus VivoBook 15 X1504 is a 15.6″ mainstream laptop built around Intel's Core i7-1255U processor, targeting everyday computing tasks with a balance of portability and screen real estate. Weighing 1,700 g and measuring just 17 mm thick, it keeps a relatively slim profile for its class, and its backlit keyboard adds convenience for low-light use. A fingerprint scanner and dual microphones round out a feature set oriented toward general productivity and day-to-day versatility.

On the performance side, the i7-1255U combines two performance cores at 1.7 GHz and eight efficiency cores at 1.2 GHz, with a turbo ceiling of 4.7 GHz across 12 threads, all within a 15 W TDP envelope. The system ships with 8 GB of DDR4 memory, expandable up to 64 GB across two channels, paired with a 512 GB NVMe PCIe 4 SSD. Graphics are handled by Intel Iris Xe with 96 execution units, supporting DirectX 12 and OpenGL 4.6. The display outputs a 1920 x 1080 resolution at 141 ppi over its 15.6″ panel, with one HDMI port available for external screens. Connectivity includes Wi-Fi 6E, two USB 2.0 ports, a 3.5 mm audio jack, and stereo speakers, while the 42 Wh battery is rated for approximately 8 hours of use.

Pros
  • Supports Wi-Fi 6E, covering the latest wireless standard alongside backward compatibility with older Wi-Fi generations
  • The CPU reaches a turbo clock speed of 4.7 GHz across 12 threads with multithreading enabled, offering solid multi-core throughput for a 15 W laptop chip
  • Storage uses an NVMe PCIe 4 SSD, which provides faster data transfer than older SSD interfaces
  • Maximum supported RAM extends to 64 GB across two channels, leaving meaningful room for future memory upgrades
  • A fingerprint scanner is built in, offering a convenient biometric login option
  • The backlit keyboard allows comfortable use in low-light environments
Cons
  • No USB Type-C port is present, limiting compatibility with modern peripherals and charging accessories
  • There is no RJ45 Ethernet port, so wired network connections require an external adapter
  • The display lacks an anti-reflection coating, which can affect visibility in bright or high-glare conditions
  • With only two USB 2.0 ports and a single HDMI output, the physical port selection is quite limited
  • The 42 Wh battery is relatively modest for a 15.6-inch laptop, contributing to a rated battery life of only 8 hours
  • No external memory card slot is available, restricting quick media transfers from cameras or other devices
Who is this for?

This laptop suits users whose daily computing revolves around office productivity, web browsing, and light content consumption, where the 12-thread CPU with a 4.7 GHz turbo and NVMe PCIe 4 SSD provide responsive everyday performance well within a 15 W thermal envelope. Students and remote workers who need a capable machine for document editing, video calls, and multi-tab browsing will find the dual-microphone setup, front camera, fingerprint scanner, and voice command support practical for day-to-day use. Those who occasionally work in dim conditions will appreciate the backlit keyboard, and users who prioritize wireless flexibility will benefit from the Wi-Fi 6E support, which accommodates fast modern routers without needing a wired connection.

Who is this NOT for?

Users who depend on a rich port selection will find this laptop limiting, as there is no USB Type-C, no Thunderbolt, no RJ45 Ethernet, and no memory card slot — making it a poor fit for photographers, videographers, or professionals who regularly transfer files or connect multiple peripherals. The integrated Iris Xe graphics with 96 execution units are not suited to GPU-intensive tasks such as gaming, 3D rendering, or video editing at high resolutions, where dedicated graphics are typically required. Additionally, users who need a fully glare-free viewing experience in bright or outdoor environments will be at a disadvantage, as the display lacks an anti-reflection coating.

Design:

weight 1700 g
Uses a fanless design ✕
Has a backlit keyboard ✓
volume 1415.896 cm³
width 359 mm
height 232 mm
thickness 17 mm
is weather-sealed (splashproof) ✕

The Asus VivoBook 15 X1504 has a footprint of 359 mm wide by 232 mm deep, with a 17 mm thickness that keeps the chassis reasonably slim for a 15.6″ laptop. It weighs 1,700 g and occupies a total volume of roughly 1,415.9 cm³. The laptop includes a backlit keyboard for low-light usability, while its active cooling setup means it does not use a fanless design. It is worth noting that the device is neither weather-sealed nor splashproof, so exposure to moisture should be avoided.

Display:

screen size 15.6"
resolution 1920 x 1080 px
pixel density 141 ppi
has a touch screen ✕
has anti-reflection coating ✕
supported displays 4

The VivoBook 15 X1504 features a 15.6″ panel with a 1920 x 1080 resolution, delivering a pixel density of 141 ppi. The display does not include a touchscreen or an anti-reflection coating. Through its GPU, the system can support up to four connected displays simultaneously.

Performance:

RAM 8GB
Uses flash storage ✓
internal storage 512GB
CPU speed 2 x 1.7 & 8 x 1.2 GHz
CPU threads 12 threads
Is an NVMe SSD ✓
DirectX version DirectX 12
uses multithreading ✓
maximum memory amount 64GB
DDR memory version 4
turbo clock speed 4.7GHz
GPU turbo 1250 MHz
PCI Express (PCIe) version 4
semiconductor size 10 nm
Supports 64-bit ✓

The processor runs two performance cores at 1.7 GHz and eight efficiency cores at 1.2 GHz across 12 threads with multithreading enabled, reaching a turbo clock speed of 4.7 GHz, and is built on a 10 nm process node with 64-bit support. The system comes with 8 GB of DDR4 RAM, expandable up to 64 GB, paired with a 512 GB NVMe SSD over PCIe 4 using flash storage for fast data access. The integrated GPU boosts up to 1,250 MHz and supports DirectX 12, rounding out a performance profile suited to everyday computing workloads.

Benchmarks:

PassMark result 13586
PassMark result (single) 3262
Cinebench R20 (multi) result 3009
Cinebench R20 (single) result 649

In benchmark testing, the VivoBook 15 X1504 records a PassMark multi-core score of 13,586 alongside a single-core result of 3,262, reflecting the processor's threading capability relative to its per-core throughput. Cinebench R20 results follow a similar pattern, with a multi-core score of 3,009 and a single-core score of 649, giving a consistent picture of the CPU's performance across both sustained multi-threaded workloads and lighter single-threaded tasks.

Connectivity:

Thunderbolt 4 ports 0
Thunderbolt 3 ports 0
has an HDMI output ✓
Has USB Type-C ✕
supports Wi-Fi ✓
Wi-Fi version Wi-Fi 6E (802.11ax), Wi-Fi 6 (802.11ax), Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n)
has an external memory slot ✕
RJ45 ports 0
HDMI ports 1
DisplayPort outputs 0
USB 2.0 ports 2
has AirPlay ✓
mini DisplayPort outputs 0
has a VGA connector ✕

Wireless connectivity on the VivoBook 15 X1504 covers Wi-Fi 6E (802.11ax) along with backward-compatible support for Wi-Fi 6, Wi-Fi 5, and Wi-Fi 4, and the laptop also supports AirPlay. For wired and display output, it offers one HDMI port and two USB 2.0 ports, while Thunderbolt 3, Thunderbolt 4, USB Type-C, DisplayPort, mini DisplayPort, and VGA outputs are all absent. There is no RJ45 Ethernet port and no external memory card slot.

Battery:

Battery life 8 hours
battery size 42 Wh
Has sleep-and-charge USB ports ✕
Has a MagSafe power adapter ✕

The VivoBook 15 X1504 is equipped with a 42 Wh battery rated for up to 8 hours of use on a charge. The laptop does not include sleep-and-charge USB ports, nor does it use a MagSafe power adapter.

Features:

has stereo speakers ✓
has a socket for a 3.5 mm audio jack ✓
has Dolby Atmos ✕
Stylus included ✕
Has a fingerprint scanner ✓
number of microphones 2
Uses 3D facial recognition ✕
has voice commands ✓
has a front camera ✓
Has S/PDIF Out port ✕
has a gyroscope ✕
has GPS ✕
has an accelerometer ✕
has a compass ✕
Has an optical disc drive ✕

The VivoBook 15 X1504 includes stereo speakers, a 3.5 mm headset jack, and a dual-microphone setup, though it does not feature Dolby Atmos or an S/PDIF output. A fingerprint scanner handles biometric authentication, while 3D facial recognition is not supported. The laptop has a front camera and supports voice commands, but does not come with a stylus. Motion and location sensors — including a gyroscope, accelerometer, compass, and GPS — are absent, and there is no optical disc drive.

Miscellaneous:

clock multiplier 17
GPU name Iris Xe Graphics 96EU
L2 cache 9.5 MB
L1 cache 928 KB
L3 cache 12 MB
Has an unlocked multiplier ✕
Has NX bit ✓
CPU temperature 100 °C
OpenCL version 3
OpenGL version 4.6
GPU execution units 96
Has integrated graphics ✓
Supports ECC memory ✕
memory channels 2
Thermal Design Power (TDP) 15W
Type Laptop
instruction sets SSE 4.2, SSE 4.1, AVX, AES, FMA3, F16C, MMX
RAM speed (max) 5200 MHz

The CPU carries a clock multiplier of 17 and operates within a 15 W TDP, with a maximum rated temperature of 100 °C; the multiplier is locked. Cache memory is arranged across three levels — 928 KB of L1, 9.5 MB of L2, and 12 MB of L3 — and the processor supports a range of instruction sets including SSE 4.1, SSE 4.2, AVX, AES, FMA3, F16C, and MMX, along with NX bit for hardware-level security. Graphics are handled by the integrated Intel Iris Xe with 96 execution units, supporting OpenCL 3 and OpenGL 4.6, while ECC memory is not supported. The two memory channels can accommodate RAM speeds of up to 5,200 MHz, and the platform is classified as a laptop-category processor.

Final Verdict

The Asus VivoBook 15 X1504 is a straightforward 15.6″ productivity laptop that delivers dependable everyday performance through its 12-thread CPU, 4.7 GHz turbo capability, and fast NVMe PCIe 4 SSD — all within a slim 17 mm chassis with Wi-Fi 6E and a practical feature set including a fingerprint scanner and backlit keyboard. Its limitations — a sparse port layout, integrated-only graphics, and a display without anti-reflection coating — mean it is clearly aimed at general users rather than creative professionals or power users. For students and remote workers seeking a capable daily driver for productivity and communication tasks, it covers the essentials competently, but those with more demanding connectivity or graphics requirements will need to look elsewhere.