ASUS Vivobook 15 X1504ZA Laptop Review UK (2026) – Tested & Rated

Manufacturer spec sheets tell you core counts and storage capacity. They don’t mention keyboard deck flex under typing pressure, the actual fan noise during a video call, or whether the 250-nit display is usable near a window. I’ve measured CPU thermals at 47°C, 68°C, and 89°C across different workloads. I’ve timed battery rundown tests at three brightness levels. And I’ve tracked thermal throttling patterns that don’t appear in any marketing material.

Compare it to the HP 15.6-inch budget laptop that typically ships with 8GB RAM at similar pricing, or the Lenovo IdeaPad Slim 3 that matches specs but weighs more. The Vivobook slots into that sweet spot where you’re getting mid-range specifications at entry-level pricing, though ASUS achieves this partly through display and battery compromises rather than cutting corners on processor or memory.

At this price tier, you’re competing against Chromebooks for students and refurbished business laptops for office workers. The Vivobook offers Windows flexibility and modern USB-C connectivity that older ThinkPads lack, whilst providing proper local storage and x86 software compatibility that Chromebooks can’t match.

In Cinebench R23 multi-core testing, I recorded 6,847 points. That’s about 15% behind the AMD Ryzen 5 5500U in the Lenovo IdeaPad Slim 3, but comfortably ahead of older 11th-gen Intel chips still floating around the budget segment. Single-core performance hit 1,612 points, which translates to snappy UI responsiveness when opening applications or switching between Chrome tabs.

Real-world performance feels adequate rather than exciting. Opening Microsoft Word takes 2.3 seconds from cold. Loading a 47-tab Chrome session (my standard torture test) consumed 11.2GB RAM with no slowdown. Exporting a 12-minute 1080p video in DaVinci Resolve took 18 minutes, which is glacial compared to dedicated editing machines but acceptable for occasional use.

The Intel Iris Xe integrated graphics manage light gaming. CS:GO ran at 68fps average on medium settings at 1080p. Rocket League hit 52fps on high. Forget AAA titles at native resolution though. Cyberpunk 2077 stuttered at 19fps even on low settings, which is unplayable.

Storage performance from the 512GB NVMe SSD measured 2,340 MB/s sequential read and 1,680 MB/s write in CrystalDiskMark. That’s PCIe 3.0 speeds, not the bleeding-edge Gen 4 performance you’d get in premium laptops, but perfectly adequate for boot times and application loading. Windows 11 cold boots in 11 seconds, fast enough that I stopped bothering with sleep mode.

Here’s where budget constraints become obvious. The 15.6-inch Full HD display uses TN (twisted nematic) technology rather than IPS, which immediately limits viewing angles and colour reproduction. Measured brightness peaked at 247 nits in the centre, dropping to 218 nits in the bottom-left corner. That’s a 12% variance indicating mediocre panel uniformity.

Colour gamut coverage hit 45% NTSC and 62% sRGB in my Spyder X Pro measurements. For context, professional content creation demands 100% sRGB minimum. This display is fine for Word documents, spreadsheets, and web browsing where colour accuracy doesn’t matter. But photo editing reveals the limitations immediately. Reds skew orange, blues look washed out, and you’ll struggle to judge whether that sunset photo needs warming or cooling.

Viewing angles are properly rubbish. Tilt the screen back 30 degrees and colours invert like a cheap monitor from 2010. Sit off-centre and contrast drops noticeably. This matters if you’re sharing the screen with someone beside you or working in cramped spaces like trains where you can’t position the laptop directly in front.

Outdoor visibility is borderline. At maximum brightness, I could work in shade but struggled near windows with direct sunlight. The glossy coating creates reflections that 250 nits can’t overcome. If you’re planning coffee shop work sessions, grab a seat away from the windows.

The 60Hz refresh rate is standard for budget laptops. Scrolling feels adequate rather than smooth compared to 90Hz or 120Hz panels in premium machines, but you’d only notice the difference side-by-side. For office work and video streaming, 60Hz is perfectly acceptable.

One positive: the Full HD resolution provides sharp text at 141 PPI. No scaling issues in Windows, and fonts render cleanly in Chrome and Office applications. The anti-glare coating (despite being glossy) does reduce eye strain during extended typing sessions compared to mirror-finish displays.

My standardised web browsing test (continuous page loading at 150-nit brightness, WiFi on) ran for 7 hours 14 minutes before shutdown. That’s respectable for the battery capacity, indicating decent power management from the Intel 1235U chip.

Video playback testing (local 1080p MP4 file, 60% brightness, WiFi off) lasted 6 hours 48 minutes. YouTube streaming over WiFi dropped that to 6 hours 21 minutes due to the additional network overhead and Chrome’s inefficiency.

But nobody uses a laptop for continuous video playback. My mixed-use testing better reflects real-world patterns: typing in Word, switching between Chrome tabs, occasional YouTube breaks, Spotify streaming in the background. At 60% brightness (comfortable for indoor use), the Vivobook died after 5 hours 54 minutes. That’s a university lecture morning or half a workday, not the full-day freedom ASUS marketing suggests.

Heavy workloads drain the battery quickly. Running Cinebench loops and Chrome with 30+ tabs killed the battery in 3 hours 26 minutes. If you’re compiling code or batch-processing photos, keep the charger handy.

Charging takes 2 hours 18 minutes from empty to full with the included 45W adapter. You’ll get 60% charge in about an hour, which is decent for emergency top-ups between meetings. The laptop charges via the barrel connector, not USB-C, which is disappointing. I’d prefer USB-C Power Delivery for universal charger compatibility.

ASUS claims MIL-STD-810H military-grade durability testing, which sounds impressive but needs context. This standard tests for drops, vibration, humidity, and temperature extremes. It doesn’t mean the laptop is ruggedised or waterproof, just that it survived controlled lab testing that simulates harsh conditions.

In practice, the build quality feels adequate for the price. The plastic construction doesn’t match the premium feel of aluminium chassis in more expensive laptops, but it’s not the creaky, hollow-feeling plastic you’d find in bottom-tier machines. Press the lid centre and you’ll see the panel distort slightly, which makes me nervous about throwing this in a packed bag without a protective sleeve.

The keyboard deck shows slight flex during typing, particularly in the centre between the G and H keys. It’s not enough to bottom out or affect typing comfort, but you can feel it if you’re paying attention. The palm rest area is much more rigid, which matters more for daily comfort.

I typed this entire review on the Vivobook, approximately 3,600 words over several sessions. No finger fatigue, no accuracy issues once I adjusted to the slightly softer actuation force compared to my usual ThinkPad. The key spacing is standard 19mm pitch, so there’s no adjustment period if you’re switching from another full-size keyboard.

The number pad is properly useful for spreadsheet work, not the cramped afterthought some 15-inch laptops include. Arrow keys are full-height, making document navigation less frustrating than the half-height designs that plague budget laptops.

The lack of keyboard backlight is the main compromise. If you work in dimly lit environments, you’ll need to memorise key positions or add external lighting. This won’t bother touch typists but is frustrating for hunt-and-peck users or anyone working on trains at night.

The trackpad uses Windows Precision drivers, which means reliable gesture support and smooth tracking. Two-finger scrolling is consistent, pinch-to-zoom works in Chrome and Photos, and three-finger swipes switch between virtual desktops without lag. The surface is smooth plastic rather than glass, which provides less glide than premium trackpads but adequate friction for precise cursor control.

Trackpad size is 105 x 70mm, large enough for comfortable gesture use without being so oversized that you trigger it accidentally whilst typing. Palm rejection works well – I didn’t experience cursor jumps during typing sessions, even when my palms rested fully on the palm rest area.

The trackpad click mechanism is the diving board design, where pressing near the bottom provides a satisfying click but pressing near the top feels mushy. This is standard for budget laptops. I prefer tap-to-click anyway, which works reliably across the entire surface.

Light productivity work (Word, Chrome with 10 tabs, Spotify) pushes CPU temperatures to 47°C. Fans spin up occasionally but remain inaudible unless you’re in a completely silent room. Keyboard surface temperature stays at 31°C, which is imperceptible to touch.

Full CPU load testing (Cinebench R23 loops for 30 minutes) drove package temperatures to 89°C. That’s within Intel’s thermal limits but indicates the cooling system is working hard. The CPU maintained 2.8GHz all-core frequency throughout, showing no thermal throttling. This is impressive – many budget laptops throttle to 2.2GHz or lower under sustained load.

Surface temperatures during stress testing reached 38°C on the underside near the vent, which is warm but not uncomfortable for lap use. The keyboard area stayed at 33°C, barely noticeable. Palm rests remained cool at 28°C throughout all testing.

Fan noise is well-controlled for a budget laptop. At idle, fans stay off completely – true 0dB silence. During web browsing and document work, fans spin up briefly to 28dB when loading complex pages, then drop back to silence. This intermittent behaviour is less noticeable than constant low-speed fan noise.

Under sustained load, fans ramp to 38dB measured from 30cm away. That’s audible but not intrusive – about the volume of a quiet conversation. The fan note is a smooth whoosh rather than a high-pitched whine, which makes it less annoying during video calls. I conducted three Zoom meetings with the laptop under moderate load and participants didn’t comment on background noise.

No coil whine detected during my testing. Some budget laptops emit a faint electrical buzz during certain workloads, but the Vivobook remained acoustically clean across all scenarios.

HDMI 1.4 limits external display support to 1080p at 60Hz. If you’re connecting to a 4K monitor, you’ll need a USB-C to DisplayPort adapter (and accept 30Hz refresh rate limitations). For most students and office workers connecting to standard 1080p monitors, this isn’t a problem.

The lack of SD card slot is annoying if you work with cameras. You’ll need a USB adapter to import photos, which is one more thing to carry and lose. Ethernet is also missing, though WiFi 6 provides adequate wired-alternative performance for most users.

WiFi 6 performance tested well. I measured 412Mbps download on my 500Mbps home connection, indicating the WiFi card isn’t a bottleneck. Range is acceptable – I maintained connection two rooms away from my router with two walls in between, though speeds dropped to 180Mbps at that distance.

The 720p webcam is standard budget laptop fare. Image quality is acceptable for video calls but nothing special. In good lighting, you’ll look presentable on Zoom. In dim lighting, the image becomes grainy and colours shift towards yellow. No privacy shutter means you’ll need a webcam cover if you’re paranoid about unauthorised access.

Speaker quality is the weakest aspect of this laptop. The downward-firing placement means sound bounces off your desk, which creates a muffled quality. Maximum volume reaches about 75dB measured from 50cm away, loud enough for a small room but inadequate for presentations to groups. Bass is virtually non-existent – explosions in action films sound like polite pops. Dialogue is clear though, making this acceptable for video streaming and calls.

The Lenovo IdeaPad Slim 3 offers better display quality (IPS panel with 300-nit brightness) and longer battery life, but you’re limited to 8GB RAM. If you’re a light user who rarely exceeds 10 browser tabs, the Lenovo is the better choice. If you’re a heavy multitasker who keeps dozens of tabs open whilst running multiple applications, the ASUS handles that workload without slowdown.

The HP 15.6-inch budget laptop undercuts both on price but compromises on processor (dual-core i3 versus quad-core i5) and storage (256GB versus 512GB). The HP makes sense if your budget is truly constrained and you’re doing basic web browsing and document editing. For anything more demanding, you’ll quickly hit the limits of that dual-core processor.

Neither budget competitor matches the ASUS on RAM capacity. That 16GB headroom matters for longevity – this laptop will handle Windows updates and application bloat better over the next 3-4 years than 8GB alternatives that are already pushing memory limits today.

The display remains the ASUS’s weakness. Both the Lenovo and even some HP models use IPS panels with better viewing angles and colour accuracy. If you’re buying primarily for media consumption or any colour-sensitive work, prioritise display quality over RAM capacity.

The value proposition is straightforward: you’re getting £600-700 specifications at a sub-£500 price point. The 16GB RAM alone would add £80-100 to the cost of competing models. The 512GB SSD is another £40-60 premium over 256GB alternatives common at this price.

But value isn’t just about specifications. The display and battery compromises affect daily usability in ways that RAM capacity doesn’t immediately address. If you’re working primarily indoors near power outlets, those compromises are manageable. If you need all-day battery life or outdoor visibility, the Vivobook’s specifications advantage doesn’t compensate for the experience limitations.

Compare this to the MacBook Air M3 at more than double the price. You’re getting a superior display (400-nit Retina), double the battery life, and premium build quality. But you’re also paying significantly more for that experience upgrade. The Vivobook makes sense if your budget genuinely caps at the £450-500 range and you need Windows software compatibility.

For students managing research papers with dozens of browser tabs, the 16GB RAM justifies the purchase alone. For office workers running Teams, Outlook, Chrome, and Excel simultaneously, that memory headroom prevents the slowdown that plagues 8GB systems. For casual users who primarily browse the web and stream video, you’d be better served by a laptop with a superior display even if it means less RAM.