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* Relion Upgradability is severely limited: typically only the RAM and hard drive can be upgraded. Often the CPU can also be replaced, and sometimes video card modules are upgradable too. Many laptops also include a MiniPCI slot inside, however it is usually not intended to be utilized by the end user. Because nearly all functions are integrated into the proprietary-design mainboard theoretically to save space and power, laptops are difficult to repair and upgrade. Outright replacement of faulty parts can include the display screen, drives, daughterboards, modem, storage devices and other components, but repair costs can be high, even when feasible (low upgradability). There is not a standard for A4-size laptops. * Desknote Similarly it is often possible to wirelessly connect a laptop using a cellphone as a modem. Infra-red, USB and Bluetooth solutions are available. The same caveats regarding price of service apply. Laptops generally cost more than a desktop computer of similar specification. Performance is usually lower than that of a comparable desktop because of the compromises necessary to keep weight and power consumption low.

Some computer novices assume that laptops are constantly connected to the Internet, even (for example) while located on moving vehicles. This is a myth perpetuated by many commercials, where a person is shown using the company's website from a laptop with no wires plugged into it. This is possible via Wi-Fi or related technologies, but most laptops do not maintain a constant connection to the Internet. The growth of Metropolitan area networks may render a constant connection possible in the future. However, most modern mid-range laptops have integrated WiFi, so only require access to a wireless router to connect to the internet or a wireless hotspot. * Averatec * Alienware - Area 51m, Sentia and Aurora m series * Portable computer

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* Most laptops are powered or recharged from an external AC converter that usually takes the form of a plain black rectangular box. These devices weigh about 500 g (about 1 lb) and often take the name "power brick." * Linuxcertified - Linux laptop * Desknote * Most modern laptops use an active matrix display with resolutions of 1024 by 768 pixels (XGA) and above, screen sizes 10 inch (250 mm) or larger, and have a PC-Card expansion bay for expansion cards, formerly called PCMCIA. Internal hard disks are physically smaller—2.5 inch (64 mm) compared to the standard desktop 3.5 inch (90 mm) drive—and usually have lower performance and power consumption. Display adapters and sound cards are integrated. Modern laptops can often handle sophisticated games, but tend to be limited by their fixed screen resolution and display adapter type. Later PowerBooks introduced the first 256-color displays, first true touchpad, and first built-in Ethernet networking. Many parts for a laptop computer are smaller, lighter, or otherwise adapted from the corresponding part in a desktop computer: Despite their name, using a laptop on one's lap can be both unpleasant (due to heat from the computer, particularly from its CPU) and possibly even dangerous to the laptop, as it may overheat. It is sometimes preferable to use a laptop on a desk.

* Alienware - Area 51m, Sentia and Aurora m series * NEC - VERSA, LaVie * Compaq - EVO, Armada, LTE, and Presario * LG - XNOTE * Notebooks smaller than a A4 sheet of paper and weighing around 1 kg are sometimes called sub-notebooks or subnotebooks. Performance * Voodoo PC - Envy