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Low end gaming can be defined as gaming on modest 'low end' system requirements. Because of the way that PC hardware continually develops, there is no fixed definition of what can be considered 'low end'. However, PCGamingWiki has chosen to focus on providing information about gaming on hardware that is 'pre-Ivy Bridge', or requires modest hardware that achieves a score of less than 6000 in 3DMark06.
This page is closely related to the /r/lowendgaming subreddit.
PCGamingWiki has chosen this cut-off point to determine what is low end gaming because, as of 2012, Intel's Ivy Bridge (on its impressive HD 4000 chip) and AMD's Fusion chips will provide relatively high quality 3D performance as a standard for virtually all computers in the future. This is in stark contrast to previous generations of integrated GPUs such as HD 3000 or GMA 950, which had very poor 3D performance compared to dedicated GPUs of its time.
On a typical low end graphics system, such as a GMA 950, games which do not utilise 3D are more likely to run smoothly. While there are many things to take into account when investigating whether or not a game will run on such a machine, the single biggest factor is age. Most games released 8+ years ago will run fairly well on anything short of an old toaster netbook. This being said, another important thing to keep an eye on is the genre. First Person Shooters are much less likely to run well than, say, Real Time Strategy games.
Emulators tend to run well on low end hardware, for example, the emulation of PlayStation and Nintendo DS titles. PlayStation 2 and other more recent consoles require high system requirements to run well.
Flash games typically perform well on integrated graphics if they are run within their own process, for example, Machinarium or VVVVVV. However, many Flash games are integrated into browsers. Unless one has a GPU with hardware Flash acceleration, one may experience a great deal of slowdown playing certain Flash games. For example, The Binding of Isaac provides a very poor experience even on relatively good hardware.
Many games can be tweaked so that they can be run on hardware that does not meet the minimum system requirements, for example, Diablo III can be run on a GPU as low as an Intel G41. Mods and utilities can also be used to increase performance in games, for example, Skyrim can be modded to increase frame rate.
One of the more useful things to keep in mind is that the minimum resolution for a game might not be shown in the in-game options. This happens surprisingly often and the lower resolution can often bring the frame rate from something unplayable to something manageable. The most common way to get to such small resolutions is to find and edit the relevant configuration file, but as always this depends on the game you're dealing with. Although, there has been many successful methods to changing the config file of a certain game, mainly the most popular ones.
Individual PCGamingWiki articles will often list tweaks that improve performance.
Google Chrome has its own implementation of Flash, known as PepperFlash.
If you experience problems with flash games, you can switch to the official Adobe Flash player by opening chrome://plugins/, expanding details for ShockwaveFlash, and disabling the entry for pepflashplayer.dll. This shouldn't be required for most games, but is a known issue with Kongregate and rare flash games.