HP OmniBook 5 Flip 14 vs Acer Aspire 15 A15-51 Comparison

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HP OmniBook 5 Flip 14

14 inches | March 2025

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Acer Aspire 15 A15-51

15.6 inches | August 2024

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HP OmniBook 5 Flip 14 vs Acer Aspire 15 A15-51 Comparison Overview

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In this review, we will be comparing OmniBook 5 Flip 14 and Aspire 15 A15-51, two laptops from HP and Acer. HP OmniBook 5 Flip 14 was introduced to market in March 2025 and Acer Aspire 15 A15-51 was launched in August 2024. There is only 7 months difference between OmniBook 5 Flip 14 and Aspire 15 A15-51 so we are expecting this to be a fair comparison regarding age and technology level.

Click for Available Configurations of the Laptops

Here is a brief look at the main features of HP OmniBook 5 Flip 14 and Acer Aspire 15 A15-51 before getting into our more detailed comparison.

HP OmniBook 5 Flip 14 Key Specs

Launched in March 2025
14.0" TouchScreen - IPS LCD, 16:10 Aspect Ratio Display
CPU: Intel Core i5 1334U,Intel Core 3 100U,Intel Core 5 120U,Intel Core 7 150U
GPU: Intel Iris Xe Graphics G7 (80EU)
8GB,16GB,24GB Ram
313 x 219.9 x 18.4 mm (12.32 x 8.66 x 0.72 inches)
Weight: 1.62 kg (3.57 lbs)

Acer Aspire 15 A15-51 Key Specs

Launched in August 2024
15.6" TN LCD, 16:9 Aspect Ratio Display
CPU: Intel Core 3 100U
GPU: Intel UHD Graphics (64 EU)
8GB Ram
362.9 x 237.5 x 17.9 mm (14.29 x 9.35 x 0.7 inches)
Weight: 1.77 kg (3.9 lbs)

Let's read on the following sections in order to better understand in detail how OmniBook 5 Flip 14 and Aspire 15 A15-51 compares and decide which one is better for you.

**This post contains affiliate links and I will be compensated if you make a purchase after clicking through my links. As an Amazon Associate I earn from qualifying purchases.

Reasons to choose HP OmniBook 5 Flip 14 over Acer Aspire 15 A15-51

Weight	1.62 kg vs 1.77 kg	0.15 kg lighter
Screen-to-Body Ratio	~82.6% vs ~77.9%	Larger screen area ratio
Side Bezel Thickness	5.8 mm vs 8.8 mm	3 mm thinner bezels
Screen PPI	162 ppi vs 141 ppi	More pixels per inch
Touch Screen	Yes vs No	Interact with your fingers
Screen Resolution	1920 x 1200 pixels vs 1920 x 1080 pixels	Higher pixel count screen
GPU FLOPS	1.6 TFLOPS vs 0.87-1.54 TFLOPS	More advanced Bluetooth connectivity
Bluetooth	v5.4 vs v5.3	Higher Resolution Camera
Webcam Resolution	2560 x 1440 vs 1920 x 1080	Connect more device at the same time
Number of USB-C Ports	2x USB 3.2 vs 1x USB 4.0

Reasons to choose Acer Aspire 15 A15-51 over HP OmniBook 5 Flip 14

Display Size	15.6 inches vs 14 inches	Larger Screen Estate
Screen Type	Matte vs Glossy	potentially less reflections on screen
USB-C Port Type	v4.0 vs v3.2	Faster USB-C connection
Numeric Pad	Yes vs No	Fast way to input numbers
Keyboard Backlight	Yes vs No	Easily see the keys under low light

Common Strengths of Acer Aspire 15 A15-51 and HP OmniBook 5 Flip 14

Launch Dates	March 2025 vs August 2024	Both laptops are recent models
Fast Charging Support	Yes vs Yes	Charge the battery in a shorter time
RAM Type	PCI-E Gen 4.0 (4x) vs PCI-E Gen 4.0 (4x)	Fast RAM type
Upgradable Storage	Yes vs Yes	Option to increase the Storage size
SSD Type	NVMe vs NVMe	Faster Data Transfers
Wi-Fi Standard	v6E vs v6E	Fast and Reliable Wi-Fi Connections
HDMI Output	1x HDMI 2.1 vs 1x HDMI 2.1	Connect to External Displays via HDMI cable
VGA Output	No vs No	Connect to External Displays via VGA cable

Common Weaknesses of Acer Aspire 15 A15-51 and HP OmniBook 5 Flip 14

HDR Support	No vs No	No HDR Support
Upgradable RAM	No vs No	No Option to increase the RAM size

HP OmniBook 5 Flip 14 vs Acer Aspire 15 A15-51: Physical Specs Comparison

In this section, we will be comparing the physical specifications and body features of the HP OmniBook 5 Flip 14 and the Acer Aspire 15 A15-51.

Physical Specs
Weight	1.62 kg (3.57 lbs)	1.77 kg (3.9 lbs)
Surface Area	688 cm2 (106.7 inches2)	862 cm2 (133.6 inches2)
Screen to Surface Ratio	~82.6%	~77.9%
Side Bezel Thickness	~5.8 mm	~8.8 mm
Weight per Inch of Screen	0.12 kg/inch	0.11 kg/inch
	0.264 lbs/inch	0.242 lbs/inch
Colors	Silver, Pink	Gray

Comparison of the HP OmniBook 5 Flip 14 and the Acer Aspire 15 A15-51 External Dimensions

Weight

OmniBook 5 Flip 14 weighs 1.62 kg (3.57 lbs), whereas the Aspire 15 A15-51 weighs 1.77 kg (3.9 lbs). There is a notable difference in weight between these two laptops. However, it's important to consider that comparing their weights directly may not provide a complete picture since they also have different display sizes.

Weight Comparison

HP OmniBook 5 Flip 14 1.62 kg

Avg: 14.0-14.9" 1.42 kg

Acer Aspire 15 A15-51 1.77 kg

Avg: 15.0-15.9" 1.95 kg

Thickness Comparison

HP OmniBook 5 Flip 14 18.40 mm

Avg: 14.0-14.9" 17.12 mm

Acer Aspire 15 A15-51 17.90 mm

Avg: 15.0-15.9" 20.17 mm

Another value that we use for comparing the weights of the laptops is the Weight per Inch of Screen, which is calculated by dividing the total weight of the model with its usable diagonal screen size. This value for the HP OmniBook 5 Flip 14 is 0.12 kg/inch.In comparison, this value for the Acer Aspire 15 A15-51 is 0.11 kg/inch.Here are some of the best performing laptops in this area:

Microsoft Surface Go 4: 0.05 kg/inch
LG Gram SuperSlim 15.6 2023: 0.06 kg/inch
Asus ProArt PZ13 HT5306: 0.06 kg/inch
Asus Zenbook A14 UX3407: 0.06 kg/inch
Microsoft Surface Pro 12: 0.06 kg/inch
Dell Latitude 7330: 0.07 kg/inch
Lenovo ThinkPad X1 Nano Gen 2: 0.07 kg/inch
LG Gram 14 2022: 0.07 kg/inch

HP OmniBook 5 Flip 14 vs Acer Aspire 15 A15-51: Internals (CPU, GPU, RAM, Battery, SSD, etc.) Comparison

CPU Comparison

CPU Model	Intel Core i5 1334U Intel Core 3 100U Intel Core 5 120U Intel Core 7 150U	Intel Core 3 100U Intel Core 5 120U Intel Core 7 150U
Base Frequency	1.3 GHz	1.2 GHz
Turbo Frequency	4.6 GHz	4.7 GHz
Number of Cores	10 (2P + 8E)	6 (2P + 4E)
Number of Threads	12	8
L3 Cache	12 MB	10 MB
Integrated GPU	Intel Iris Xe Graphics (80EU)	Intel UHD Graphics (64 EU)
CPU Fabrication Process	10 nm	10 nm

Above you can see the CPU options and the CineBench and GeekBench test scores for both laptops, which gives an idea about what kind of performance difference you may experience between the HP OmniBook 5 Flip 14 and Acer Aspire 15 A15-51.

You may also read reviews of latest laptops with the same CPU ( Intel Core 3 100U ) and compare them:

GPU Comparison

GPU Model	Intel Iris Xe Graphics G7 (80EU)	Intel UHD Graphics (64 EU)
Base Clock Frequency	300 MHz	300 MHz
Boost CLock Frequency	1100 MHz
TGP (Total Graphics Power)	15 W	45 W
Type	Integrated	Integrated
FLOPS	1,408 GFLOPS	0.87-1.54 TFLOPS
Memory Size	System Shared	System Shared
Memory Type	System Shared	LPDDR5
Memory Bus	System Shared
Memory Speed	System Shared	6.4 Gbps
Shading Units Cores	640	512
TMUs	40	32
ROPs	20	16

GPU is as critical as the CPU for graphic heavy applications and the table above gives a picture of how the two GPU compares. FLOPS is a measure of a GPU's performance based on the number of floating-point arithmetic calculations that the processor can perform within a second. HP OmniBook 5 Flip 14 has a FLOPS value of 1.6 TFLOPS whereas the Acer Aspire 15 A15-51 ' has a FLOPS value of 0.87-1.54 TFLOPS. If graphical performance of the laptop is important for your use type, the HP OmniBook 5 Flip 14 may be the better choice between these two setups.

RAM Comparison

RAM	8GB 16GB 24GB	8GB 16GB
Memory Bus	1x8 GB	1x8 GB
RAM Clock	6400 MHz	6400 MHz
RAM Type	LPDDR5	LPDDR5
Upgradable	No	No
Memory Bus	PCI-E Gen 4.0 (4x)	PCI-E Gen 4.0 (4x)

Both laptops, the OmniBook 5 Flip 14 and the Aspire 15 A15-51, come with similar RAM capacities of 8 GB, providing comparable performance in memory-intensive tasks.

LOCAL LLM Compatibility Evaluation

This quick guide shows what types of large language models (LLMs) each of these laptops could support, based on their respective hardware specifications. It's meant to help you compare their suitability for running AI models locally.

LLM Category	HP OmniBook 5 Flip 14"	Acer Aspire 15 (A15-51)
Small Models(1-3B):Examples: Phi-2, Qwen-1.8B	✔ Run smoothly.	✔ Run smoothly.
Medium Models(7-8B):Examples: Mistral-7B, Qwen-7B	✔ Good performance.	✖ Not supported.
Large Models(13-30B):Examples: Mixtral, Qwen-14B	✖ Not supported.	✖ Not supported.
Extra-Large Models(65B+):Examples: LLaMA2-70B, Qwen1.5-72B	✖ Not supported on most systems. Requires high-end GPU or advanced setup.	✖ Not supported on most systems. Requires high-end GPU or advanced setup.

Note: Optimized (e.g., 4-bit) models may run on limited hardware. Performance depends on runtime and setup.

📌 MoE Models: Some models like Mixtral 8x7B and Qwen3-30B-A3B use a Mixture of Experts (MoE) design, activating only part of the model during inference. This means they can often run efficiently on laptops with 12–16 GB of VRAM when quantized.

BATTERY

BATTERY	68 Wh	53 Wh
Battery Type	Li-Po	Li-Ion
Replaceable	No	No
Fast Charging	No	No
Charging Port Position	Left	Left
Charge Power	45 / 65 W	65 W

Moreover, the OmniBook 5 Flip 14 boasts a larger battery capacity of 68 Wh, offering extended usage time compared to the Aspire 15 A15-51's53 Wh.

Battery Comparison

HP OmniBook 5 Flip 14 68 Wh

Avg: 14.0-14.9" 55.79 Wh

Acer Aspire 15 A15-51 53 Wh

Avg: 15.0-15.9" 62.1 Wh

STORAGE
Both laptops, the OmniBook 5 Flip 14 and the Aspire 15 A15-51 have similar max. storage capacities of 1 TB, allowing for ample space to store files and applications.

Storage Options	256 GB, 512 GB, 1 TB	256 GB, 512 GB, 1 TB
Upgradable	Yes	Yes
Total Slots	1	1
Storage type	SSD (M2)	SSD (M2)
NVMe	Yes	Yes

If your budget allows, we recommend opting for the largest possible disk size, considering the potential increase in storage capacity needs in the future. However, please keep in mind the question 'What will the laptop be used for?' when making this decision. Of course, you can later upgrade the hard disk capacity by getting a larger disk. However, if your laptop has only one disk slot, it may not be as straightforward as a RAM upgrade, where you simply add or replace a module, as moving or cloning files to a new disk may be necessary.

HP OmniBook 5 Flip 14 vs Acer Aspire 15 A15-51: Display Comparison

The display is an essential aspect to consider when comparing the HP OmniBook 5 Flip 14 and Acer Aspire 15 A15-51 since its is the component that you interact the most and significantly impact the experience.

Screen Area and Dimensions

Now let's look at the comparison of the actual display areas of both laptops below, keeping the bezels around the screens out of the equation. OmniBook 5 Flip 14 has a display size of 14.0".On the other hand, Aspire 15 A15-51 has a larger15.6" display.The total usable screen area of the OmniBook 5 Flip 14 is 568cm² / 88inch² whereas the Aspire 15 A15-51's total usable screen area is 670cm² / 104inch².

PPI (Pixels per Inch)
Additionally, the OmniBook 5 Flip 14 features a higher pixel density with 162 pixels per inch (PPI), ensuring sharper image details.

Screen PPI (Pixels Per Inch) Comparison

HP OmniBook 5 Flip 14 162 PPI

Avg: 14.0-14.9" 173 PPI

Acer Aspire 15 A15-51 141 PPI

Avg: 15.0-15.9" 144 PPI

Refresh Rate
Both OmniBook 5 Flip 14 and Aspire 15 A15-51 offer the same refresh rate of 60 Hz.

Brightness
Both OmniBook 5 Flip 14 and Aspire 15 A15-51 offer the same maximum brightness of 300 nits (cd/m²).

Brightness Comparison

HP OmniBook 5 Flip 14 300 nits

Avg: 14.0-14.9" 383 nits

Acer Aspire 15 A15-51 300 nits

Avg: 15.0-15.9" 319 nits

HP OmniBook 5 Flip 14 vs Acer Aspire 15 A15-51 Connectivity Comparison

In terms of connectivity,

Wifi
Both laptops offer the same Wi-Fi standard (v6E), ensuring fast and reliable wireless connections.

Below, you'll find a Wi-Fi Versions Table, along with their release dates and speeds, to provide a brief overview of its development.

Wi-Fi Versions and Speeds

Standard	Speed	Release Date	Network	Frequency Bands (GHz)
Wi-Fi 7	up to 40 Gbps (5 GB/s)	2023	802.11be	2.4, 5, 6
Wi-Fi 6E	up to 9.6 Gbps (1.2 GB/s)	2020	802.11ax	2.4, 5, 6
Wi-Fi 6	up to 9.6 Gbps (1.2 GB/s)	2019	802.11ax	2.4, 5
Wi-Fi 5	up to 6.93 Gbps (866.25 MB/s)	2014	802.11ac	2.4, 5
Wi-Fi 4	up to 600 Mbps (75 MB/s)	2009	802.11n	2.4, 5

* Please note that the provided transfer rates are maximum theoretical values, and real-life performance may vary based on environmental factors.

USB
Both OmniBook 5 Flip 14 and Aspire 15 A15-51 feature 2x USB 3.2 USB-A ports.
Both OmniBook 5 Flip 14 and Aspire 15 A15-51 have USB Type-C ports. OmniBook 5 Flip 14 has 2x USB 3.2 USB Type-C ports, while Aspire 15 A15-51 has 1x USB 4.0 USB Type-C ports.

Below, you'll find a table of USB ports, along with their release dates and speeds.
To mitigate the confusion caused by generation names, the USB Implementers Forum (USB-IF) suggests using marketing names like USB 5Gbps, USB 10Gbps, and so forth, based on their respective transfer rates.

USB Type and Speeds

USB Type	Version	Speed	Date	Other Features/Explanations
USB4	Gen 4 (2.0)	80 Gbps	2022	Also known as USB 80Gbps
USB4	Gen 3×2	40 Gbps	2019	Also known as USB 40Gbps
USB 3.2	3.2 Gen 2x2	20 Gbps	2019	Double the data transfer rates of Gen 2
USB 3.2	3.2 Gen 2	10 Gbps	2017	Previously known as USB 3.1
USB 3.2	3.2 Gen 1	5 Gbps	2017	Previously known as USB 3.0
USB 3.1	3.1 Gen 2	10 Gbps	2013	Faster data transfer rates
USB 3.0	3.1 Gen 1	5 Gbps	2010	SuperSpeed USB, improved data transfer rates
USB 2.0	2.0	480 Mbps	2000	High-speed data transfer
USB 1.0	1.0	1.5 Mbps	1996	Original USB standard

Thunderbolt
Neither OmniBook 5 Flip 14 nor Aspire 15 A15-51 has Thunderbolt port.

HDMI
Both OmniBook 5 Flip 14 and Aspire 15 A15-51 feature an HDMI port (1x HDMI 2.1) for connecting to external monitors.

Below, you'll find a comparison table detailing different HDMI versions, including their bandwidth, color depth, maximum resolution, and release dates. This information can be helpful in understanding the capabilities of each HDMI version and choosing the most suitable one for your needs.

HDMI Comparison Table

HDMI Version	Maximum Resolution	Bandwidth (Gbps)	Color Depth (bits)	Release Date
HDMI 2.1-2.1b	7680 x 4320 *(8K)* @ 60p 3840 x 2160 *(4K)* @ 120p	48.0	48	2017
HDMI 2.0-2.0b	3840 x 2160 *(4K)* @ 60p	18.0	48	2013
HDMI 1.4-1.4b	3840 x 2160 *(4K)* @ 30p	10.2	48	2009
HDMI 1.3-1.3a	2560 x 1440 @ 60p	10.2	48	2006
HDMI 1.0-1.2a	1920 x 1200 @ 60p	4.95	24	2002

* Please note that the provided resolution values represent the maximum supported resolution, and actual display quality may depend on other factors such as source content and connected devices.

SD Card Reader
Neither OmniBook 5 Flip 14 nor Aspire 15 A15-51 has an SD Card Reader.

Audio Jack
Both OmniBook 5 Flip 14 and Aspire 15 A15-51 are equipped with a 3.5mm Audio Jack, providing seamless connection to headphones and speakers.

To summarize the connectivity and ports details, please refer to the table below to see them listed.

Connectivity and Ports
WiFi Standard (latest: v7)	v6E	v6E
Bluetooth (latest: v5.4)	v5.4	v5.3
USB-A (latest: 3.2)	2x USB 3.2	2x USB 3.2
USB Type-C (latest: USB4 2.0)	2x USB 3.2	1x USB 4.0
Thunderbolt (latest: 5)	No	No
HDMI (latest: 2.1)	1x HDMI 2.1	1x HDMI 2.1
Display Port (latest: v2.0)	No	No
VGA	No	No
Fingerprint Sensor	No	Optional
Optical Drive	No	No
Audio Jack 3.5mm	Yes	Yes
Ethernet RJ45	No	No
SD CardReader	No	No
Proprietary Charging Port	No	Yes