Comparison Acer Extensa 15 EX215-23 [EX215-23-R01B] vs Lenovo V15 G4 AMN [82YU00UCRA]

— Glossy. A glossy surface improves the overall picture quality: other things being equal, the picture on such a screen looks brighter and more colorful than on a matte one. On the other hand, pollution is very noticeable on such a surface, and in bright external lighting, a lot of glare appears on it, which can greatly interfere with viewing. Therefore, instead of the classic gloss, laptops are increasingly using an anti-reflective version of such a coating (see below). Nevertheless, this option still does not lose popularity: it is somewhat cheaper than the “anti-glare”, and in soft, relatively dim lighting, it can even provide a more pleasing image to the eye.

— Matte. Matte finish is inexpensive and does not form glare even from fairly bright lighting. On the other hand, the picture on such a screen is noticeably dimmer than on a similar glossy display. However, this moment can be compensated by various design solutions (primarily a good margin of brightness); so this option can be found in all categories of modern laptops — from low-cost models for working with documents to top gaming configurations.

— Glossy (anti-glare). A variation on the glossy finish described above, designed to reduce glare from external light sources. Such screens really glare noticeably less than traditional glossy ones (or even do not give glare at all); at the same time, in...terms of image quality, they are at least superior to matte ones. So it is this type of coating that is most popular nowadays.

The maximum brightness that a laptop screen can provide.

The brighter the ambient light, the brighter the laptop screen should be, otherwise the image on it may be difficult to read. And vice versa: in dim ambient light, high brightness is unnecessary — it greatly burdens the eyes (however, in this case, modern laptops provide brightness control). Thus, the higher this indicator, the more versatile the screen is, the wider the range of conditions in which it can be effectively used. The downside of these benefits is an increase in price and energy consumption.

As for specific values, many modern laptops have a brightness of 250 – 300 nt and even lower. This is quite enough for working under artificial lighting of medium intensity, but in bright natural light, visibility may already be a problem. For use in sunny weather (especially outdoors), it is desirable to have a brightness margin of at least 300 – 350 nt. And in the most advanced models, this parameter can be 350 – 400 nt and even more.

The contrast of the screen installed in the laptop.

Contrast is the largest difference in brightness between the lightest white and darkest black that can be achieved on a single screen. It is written as a fraction, for example, 560:1; while the larger the first number, the higher the contrast, the more advanced the screen is and the better the image quality can be achieved on it. This is especially noticeable with large differences in brightness within a single frame: with low contrast, individual details located in the darkest or brightest parts of the picture may be lost, increasing the contrast allows you to eliminate this phenomenon to a certain extent. The flip side of these benefits is an increase in cost.

Separately, we emphasize that in this case only static contrast is indicated — the difference provided within one frame in normal operation, at constant brightness and without the use of special technologies. For advertising purposes, some manufacturers may also provide data on the so-called dynamic contrast — it can be measured in very impressive numbers (seven-digit or more). However, you should focus primarily on static contrast — this is the basic characteristic of any display.

As for specific values, even in the most advanced screens, this indicator does not exceed 2000: 1. But in general, modern laptops have a rather low contrast ratio — it is assumed that for tasks that require more advanced image characteristics, it is more...reasonable to use an external screen (monitor or TV).

Laptop display certification for safe blue light emission levels and panel flicker rates. The presence of a TÜV Rheinland certificate confirms that the screen is comfortable for the eyes.

TÜV Rheinland is a large international concern headquartered in Cologne, Germany, providing a wide range of audit services. The company's specialists have developed and approved a number of tests for the compliance of the screens of mobile devices, monitors and TVs with the required level of eye protection from the harmful effects of display radiation on the user's vision on the other side of the screen. The authoritative opinion of TÜV Rheinland is respected in the tech community. Certificates from this body are issued to successfully tested electronics for the implementation of blue light filtering and screen flicker suppression technologies.

The result shown by the laptop processor in the Passmark CPU Mark test.

Passmark CPU Mark is a comprehensive test that is more detailed and reliable than the popular 3DMark06 (see above). It checks not only the gaming capabilities of the CPU, but also its performance in other modes, based on which it displays the overall score; this score can be used to fairly reliably evaluate the processor as a whole (the more points, the higher the performance).

The clock speed of the RAM installed in the laptop.

The higher the frequency (with the same type and amount of memory) — the higher the performance of RAM in general and the faster the laptop will cope with resource-intensive tasks. However modules with the same frequency may differ somewhat in actual performance due to differences in other characteristics; but this difference becomes significant only in very specific cases, for the average user it is not critical. As for specific values, the most popular modules on the modern market are 2400 MHz, 2666 MHz, 2933 MHz and 3200 MHz. Memory at 2133 MHz or less is found mainly in outdated and low-cost devices, and in high-performance configurations this parameter is 2933 MHz, 3200 MHz, 4266 MHz, 4800 MHz, 5200 MHz, 5500 MHz, 5600 MHz and more.

The capacity of the drive installed in the laptop. If there are several separate drives (for example, HDD + SSD, see "Drive type") — this item indicates the volume of the most capacious drive (in our example — HDD).

A larger drive allows you to store more data, but it also comes at a higher cost. At the same time, it is worth remembering that the price also depends on the type of media: for example, SSDs are much more expensive than hard drives of the same volume. So it is best to directly compare drives of the same type with each other. As for specific volumes, the most modest figures are typical for configurations with pure solid-state memory — SSD of one type or another or eMMC (see "Drive type"): among them you can find solutions for 240 – 360 GB and even 128 GB or less . Hard drive capacity actually starts at 480 – 512 GB ; 1TB storage capacity is average, and the most capacious modern laptops are equipped with storage of 2TB or even more.

The connection interface used by the M.2 SSD installed in the laptop (see "Drive type").

One of the features of the M.2 connector and drives for it is that they can use two different connection interfaces: PCI-E (in one form or another) or SATA. We emphasize that this paragraph indicates the data of the SSD module; the connector itself may provide other interface options, including more advanced ones — see "M.2 connector interface" (for example, a drive with a PCI-E 3.0 2x connection can be placed in a connector that also supports the faster PCI-E 4.0 4x). However, anyway, the connection connector usually allows you to realize all the features of the installed drive; so this item allows you to quite reliably evaluate the capabilities of the standard M.2 module.

As for specific interfaces, nowadays you can mainly find the following options:

— SATA 3. The SATA interface was originally designed for traditional hard drives. The third version of this interface is the latest; it provides data transfer rates up to 600 Mbps. This is significantly less than PCI-E, and in general, very little by the standards of SSD drives. Therefore, M.2 connection using SATA is typical mainly for low-cost entry-level modules. However, even these media are generally faster than most HDDs.

— PCI-E. Universal interface for connecting internal peripherals. Provides generally faster speeds than SATA, making it better suited for SSD modules: theoretically, PC...I-E allows you to realize the full potential of SSDs, even the fastest. In fact, the supported data transfer rate may be different — depending on the version of the interface and the number of lines (data transmission channels). Here are the options most relevant for modern laptops:

• PCI-E 3.0 2x. Connection using 2 lanes PCI-E version 3.0. This version provides speeds of about 1 GB/s per line; respectively, two lines give a maximum of just under 2 GB / s.
• PCI-E 3.0 4x. Connection using 4 lanes PCI-E version 3.0. Provides a maximum speed of about 4 GB / s.
• PCI-E 4.0 4x. Connection using 4 lanes PCI-E version 4.0. In this version, the throughput, compared to PCI-E 3.0, has been doubled — thus, 4 lines give a maximum speed of about 8 MB / s.

Note that in the case of M.2 connectors, different PCI-E variations are usually quite compatible with each other — except that the connection speed when working with a "non-native" connector will be limited by the capabilities of the slowest component. For example, when connecting a PCI-E 3.0 4x SSD module to a PCI-E 3.0 2x slot, this speed will correspond to the capabilities of the connector, and when connected to PCI-E 4.0 4x, to the capabilities of the drive.

The interface of the main M.2 connector provided in the laptop.

In this case, the main slot is considered to be the one in which the SSD M.2 drive is installed (see "Drive type"). The interface of the drive itself is indicated separately (see above), and the interface of the connector is specified if the connector supports a more advanced type of connection than the device installed in it. An example is the following situation: the device itself works according to the SATA or PCI-E 3.0 2x standard (see "M.2 drive interface" above), and the connector on the board is capable of working with the PCI-E 3.0 4x interface.

Such information will be useful, first of all, for evaluating the possibilities for upgrading a laptop (with replacing a standard SSD module with a faster one). Nowadays, in this paragraph, you can mainly find the following options:

— PCI-E 3.0 2x. In fact, the most modest PCI-E standard found in M.2 ports of modern laptops: connection using 2 lanes of PCI-E version 3.0. This version provides speeds of about 1 GB/s per line; respectively, two lines give a maximum of just under 2 GB / s.

— PCI-E 3.0 4x. Connection using 4 lanes PCI-E version 3.0. Provides a maximum speed of about 4 GB / s.

— PCI-E 4.0 4x. Connection using 4 lanes PCI-E version 4.0. In this version, the bandwidth, compared to PCI-E 3.0, has been doubled — thus, 4 lines give a maximum speed of about 8 GB / s.

— PCI-E. Connection...via PCI-E, for which the manufacturer did not specify the details (version and number of lines).

Recall that in the case of M.2 connectors, different PCI-E options are quite compatible with each other — except that the speed will be limited by the capabilities of a slower component. In fact, this means that, for example, in an M.2 connector with a PCI-E 3.0 4x interface, it is quite possible to connect a drive for PCI-E 3.0 2x or PCI-E 4.0 4x; in the first case, the speed will be limited by the capabilities of the drive, in the second, by the capabilities of the connector.