question: Why do PC's need fans or water cooling, and cell phones only need heat sinks?
comment: A cellphone running a game is running the game at settings that keep it within a certain thermal range, so you don't get a burnt hand, battery going pop, thermal shutdown etc & #x200B; It's quite possible to thrash a pc up to the point that it'll "nope" out on you due to thermals, but the amount of heat you can pour into the 'system' is far, far more due to airflow, massive heat sinks etc As a result, you can run the hardware harder and hotter e.g. tons of cores at almost 5GHz well over 60fps, 4k etc
passages: Section::::Computer types.:Mobile devices.
  
  Mobile devices usually have no discrete cooling systems, as mobile CPU and GPU chips are designed for maximum power efficiency due to the constraints of the device's battery. Some higher performance devices may include a heat spreader that aids in transferring heat to the external case of a phone or tablet.
  
  Section::::See also.
  
  BULLET::::- CPU power dissipation
  
  BULLET::::- Thermal design power
  
  BULLET::::- Thermal management of electronic devices and systems
  
  Section::::External links.
  
  BULLET::::- CPU Cooler Rules of Thumb
  
  BULLET::::- Submersion Cooling Patent Application
   BULLET::::- Operating temperature: A vehicle cabin can often experience temperature swings from . Computers typically must be able to withstand these temperatures while operating. Typical fan-based cooling has stated limits of of ambient temperature, and temperatures below freezing require localized heaters to bring components up to operating temperature (based on independent studies by the SRI Group and by Panasonic R&D).
  
  BULLET::::- Vibration can decrease the life expectancy of computer components, notably rotational storage such as HDDs.
  
  BULLET::::- Visibility of standard screens becomes an issue in bright sunlight.
   Because HotStart enables direct and immediate access to an application or multimedia, it can result in power savings.
  
  Section::::Mobile computing.:Other mobility enhancements.
  
  BULLET::::- Windows Mobility Center is a new Control Panel applet available on mobile computers that centralizes information and settings relevant to mobile features, including display brightness, power options, presentation settings, and sync settings. It is extensible so that hardware manufacturers can add further capabilities to control other features specific to their hardware.
   Boundaries that separate these categories are blurry at times. For example, the OQO UMPC is also a PDA-sized tablet PC; the Apple eMate had the clamshell form factor of a laptop, but ran PDA software. The HP Omnibook line of laptops included some devices small more enough to be called ultra mobile PCs. The hardware of the Nokia 770 internet tablet is essentially the same as that of a PDA such as the Zaurus 6000; the only reason it's not called a PDA is that it does not have PIM software. On the other hand, both the 770 and the Zaurus can run some desktop Linux software, usually with modifications.
   Single-board computers are increasingly being used to power home servers, with many of them being ARM devices. Old desktop and laptop computers can also be re-purposed to be used as home servers.
  
  Mobile phones are typically just as powerful as ARM-based single board computers. Once mobile phones can run the Linux operating system, self-hosting might move to mobile devices with each person's data and services being served from their own mobile phone.
  
  Section::::See also.
  
  Section::::See also.:Server definitions.
  
  BULLET::::- Server (computing)
  
  BULLET::::- NAS (Network-Attached Storage)
  
  BULLET::::- File server
  
  BULLET::::- Print server
  
  BULLET::::- Media server
  
  Section::::See also.:Operating systems.
  
  BULLET::::- BSD UNIX
   To avoid damage from condensation around the Peltier junction, a proper installation requires it to be "potted" with silicone epoxy. The epoxy is applied around the edges of the device, preventing air from entering or leaving the interior.
  
  Apple's Power Mac G5 was the first mainstream desktop computer to have water cooling as standard (although only on its fastest models). Dell followed suit by shipping their XPS computers with liquid cooling, using thermoelectric cooling to help cool the liquid. Currently, Dell's only computers to offer liquid cooling are their Alienware desktops.
  
  Section::::Other applications.
   BULLET::::- Security standards: When working mobile, one is dependent on public networks, requiring careful use of VPN. Security is a major concern while concerning the mobile computing standards on the fleet. One can easily attack the VPN through a huge number of networks interconnected through the line.
  
  BULLET::::- Power consumption: When a power outlet or portable generator is not available, mobile computers must rely entirely on battery power. Combined with the compact size of many mobile devices, this often means unusually expensive batteries must be used to obtain the necessary battery life.
   Businesses often provide teleworkers access to corporate in-house applications, accessible by a remote device such as a tablet or laptop. These devices are gaining popularity in the workforce but come with different underlying operating systems and therefore a variety compatibility issues. However, with the use of desktop virtualization, specifically remote desktop virtualization, any legacy application or operating system can be accessed from a mobile device, as this device is primary used as a display unit while the processing is performed on the company's internal server.
  
  Section::::Current trends.:U.S. federal government.
   BULLET::::- Touchscreen users easily interact with the units in the field without removing gloves.
  
  BULLET::::- High-temperature battery settings: Lithium ion batteries are sensitive to high temperature conditions for charging. A computer designed for the mobile environment should be designed with a high-temperature charging function that limits the charge to 85% or less of capacity.
  
  BULLET::::- External antenna connections go through the typical metal cabins of vehicles which would block wireless reception, and take advantage of much more capable external communication and navigation equipment.
  
  Section::::Security issues involved in mobile.
   BULLET::::- NAT-traversal and STUN support
  
  BULLET::::- Supported sound systems: ALSA and OSS
  
  BULLET::::- SRTP encryption for voice
  
  BULLET::::- Presence information
  
  BULLET::::- Call Hold
  
  BULLET::::- Call transfer
  
  BULLET::::- Call forwarding
  
  BULLET::::- Auto Answer
  
  The following media types for sessions are supported:
  
  BULLET::::- audio
  
  BULLET::::- video (with the external application vic)
  
  BULLET::::- application (used to triggerExternal Applications)
  
  BULLET::::- instant messaging
   The primary advantage of water cooling for cooling CPU cores in computing equipment is transporting heat away from the source to a secondary cooling surface to allow for large, more optimally designed radiators rather than small, relatively inefficient fins mounted directly on the heat source. Cooling hot computer components with various fluids has been in use since at least as far back as the development of Cray-2 in 1982, using Fluorinert. Through the 1990s, water cooling for home PCs slowly gained recognition amongst enthusiasts, but it started to become noticeably more prevalent after the introduction of the first Gigahertz-clocked processors in the early 2000s. As of 2018, there are dozens of manufacturers of water cooling components and kits, and many computer manufacturers include preinstalled water cooling solutions for their high-performance systems.
   As far as computers are concerned, off-the-shelf versions are usually newer and hence more powerful than proprietary POS terminals. Custom modifications are added as needed. Other products, like touchscreen tablets and laptops, are readily available in the market, and they are more portable than traditional POS terminals. The only advantage of the latter is that they are typically built to withstand rough handling and spillages; a benefit for food & beverage businesses.
   The basic components of laptops function identically to their desktop counterparts. Traditionally they were miniaturized and adapted to mobile use, although desktop systems increasingly use the same smaller, lower-power parts which were originally developed for mobile use. The design restrictions on power, size, and cooling of laptops limit the maximum performance of laptop parts compared to that of desktop components, although that difference has increasingly narrowed.
   A few manufacturers have shown Android TV boxes using the M802 (Shenzhen Tomato Technology, Tronsmart, Eny Technology and GeniaTech). It has been noted that some devices using the M802 may run hot and use a heatsink for cooling. This is common among other popular OTT set top boxes such as the Amazon FireTV which uses a metal shell to disperse heat, much like a heatsink would.
  
  Section::::Products.:Media player SoCs (S8 family).
   Mobile processor
  
  A mobile processor is found in mobile computers and cellphones.
  
  A CPU chip is designed for portable computers. It is typically housed in a smaller chip package, but more importantly, in order to run cooler, it uses lower voltages than its desktop counterpart and has more sleep mode capability. A mobile processor can be throttled down to different power levels or sections of the chip can be turned off entirely when not in use. Further, the clock frequency may be stepped down under low processor loads. This stepping down conserves power and prolongs battery life.
  
  Section::::See also.
   Section::::Smartphone and tablet implementation.
  
  BlackBerry 10.2 implements Host Mode (like in the BlackBerry Z30 handset). Nokia has implemented USB OTG in many of their Symbian cellphones such as Nokia N8, C6-01, C7, Oro, E6, E7, X7, 603, 700, 701 and 808 Pureview. Some high-end Android phones produced by HTC, and Sony under Xperia series also have it. Samsung Android version 3.1 or newer supports USB OTG, but not on all devices.
  
  BULLET::::- Host-powered: Sony Ericsson Xperia pro
  
  BULLET::::- Needs external USB-power: Motorola Droid 4
   Different security counter-measures are being developed and applied to smartphones, from security in different layers of software to the dissemination of information to end users. There are good practices to be observed at all levels, from design to use, through the development of operating systems, software layers, and downloadable apps.
  
  Section::::Portable computing devices.
  
  Several categories of portable computing devices can run on batteries but are not usually classified as laptops: portable computers, PDAs, ultra mobile PCs (UMPCs), tablets and smartphones.
   Although systems like UPnP and Bonjour provide many of the needed capabilities and are included in some devices, a single widely supported standard was lacking, and support within existing devices was far from universal. A guest using their smart phone would likely be able to find a hot spot and connect to the Internet with ease, perhaps using Protected Setup to do so. But the same device would find streaming music to a computer or printing a file might be difficult, or simply not supported between differing brands of hardware.
   Liquid cooling is typically combined with air cooling, using liquid cooling for the hottest components, such as CPUs or GPUs, while retaining the simpler and cheaper air cooling for less demanding components.
  
  The IBM Aquasar system uses "hot water cooling" to achieve energy efficiency, the water being used to heat buildings as well.
  
  Since 2011, the effectiveness of water cooling has prompted a series of all-in-one (AIO) water cooling solutions. AIO solutions result in a much simpler to install unit, and most units have been reviewed positively from review sites.
  
  Section::::Other techniques.:Heat pipe.
   However, mobile phones also has important disadvantages compared to the PC:
  
  BULLET::::- Physical limitations, e.g. small screen, limited keyboard
  
  BULLET::::- The large number of different mobile operating systems as well as different versions of enabling software such as Java.
  
  BULLET::::- Limited memory and bandwidth capabilities which reduces the capacity to run applications in parallel and makes it difficult to switch between different applications.
   BULLET::::- iQue M3 
  
  Section::::Hewlett Packard.
  
  Section::::Hewlett Packard.:Jornada.
  
  BULLET::::- Jornada 520 series
  
  BULLET::::- Jornada 540 series
  
  BULLET::::- Jornada 560 series
  
  BULLET::::- Jornada 680 series
  
  BULLET::::- Jornada 690 series
  
  BULLET::::- Jornada 710
  
  BULLET::::- Jornada 720
  
  BULLET::::- Jornada 728
  
  BULLET::::- Jornada 820 handheld
  
  BULLET::::- Jornada 928 Wireless Digital Assistant
  
  Note that the 600, 700 and 800 series were Handheld PCs that came before the Pocket PC platform was launched.
  
  Section::::Hewlett Packard.:HP/Compaq iPAQ.
  
  BULLET::::- H1900
  
  BULLET::::- H1910
  
  BULLET::::- H1920
  
  BULLET::::- H1930
  
  BULLET::::- H1935
  
  BULLET::::- H1940
  
  BULLET::::- H1945
  
  BULLET::::- H2200
  
  BULLET::::- H3630
  
  BULLET::::- H3670
  
  BULLET::::- H3760
  
  BULLET::::- H3850
  
  BULLET::::- H3870
  
  BULLET::::- H3950
  
  BULLET::::- H3955
   According to Telcordia GR-3028, "Thermal Management in Telecommunications Central Offices," the most common way of cooling modern telecommunications equipment internally is by utilizing multiple high-speed fans to create forced convection cooling. Although direct and indirect liquid cooling may be introduced in the future, the current design of new electronic equipment is geared towards maintaining air as the cooling medium.
   The one year on-site warranty was indicated as being one of the best features on the desktop. Other features on the desktop included four USB 2.0 ports, a Gigabit Ethernet port, DVI, Display Port, and analogue audio ports.
  
  Section::::2011.:M71z.
   BULLET::::- LG-Nortel and Polycom also make IP phones in a traditional phone form factor that operate an embedded edition of Office Communicator 2007. The physical plastic phones as referred by Microsoft are also named Tanjay Phones.
   Secure Mobile Architecture
  
  Mobile telephony (cellular) has become a commonplace aspect of modern life. Mobile computing is less well established than mobile telephony, partly because of the lack of a common standard infrastructure for secure seamless mobile computing for the Internet. With the increasing number of mobile workers, a secure mobile architecture specification is needed to allow businesses and individuals to maintain secure connections when moving or mobile.
  