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On real hardware, overclocking is possible using [http://djky2k3.tripod.com/psx_oc.html this modification].
On emulators, [[Duckstation]] allows you to overclock the CPU up to 1000% or 10xand also supports CD speed up and seek speed up. [https://github.com/SonofUgly/PCSX-Reloaded/releases This modified build] of [[PCSX-Reloaded|PCSX-R]] as well as [http://ngemu.com/threads/pcsxr-pgxp.186369/ this fork] allow for overclocking, though most games will break past 1.5x clock speed. Recent builds of Beetle PSX (the libretro fork of Mednafen's PS1 core) also support overclocking, by way of removing timing penalties instead of increasing clock speed. EPSXe also natively supports overclocking up to 4x. Hydro Thunder benefits a lot from it, running at a constant 30 FPS without any other issues.
==PS2==
==3DO==
[[Phoenix (emulator)|Phoenix]] and standalone Windows version of [[4DO]] allows up to 4.0/400% of the original 3DO clock speed, making some low frame rate titles such as [[wikipedia:Doctor_Hauzer|Doctor Hauzer]] and [[wikipedia:Killing_Time_(video_game)|Killing Time]] more playable. Also possible to overclock CPU in [[libretro]] version of [[4DOOpera]]<ref>https://docs.libretro.com/library/opera/#core-options</ref>, a [[libretro]] fork of 4DO,<br> in options in core's quick menu after game launch, but only to 2.0x speed, that still may seem slow.
The possibility of this function to break games (like incorrect physic and unplayable speed) is unknown.
In DSi and 3DS systems, it is possible to run classic DS games at higher clocks by the use of [[nds-bootstrap]]. This hypervisor has the option of running classic DS games in DSi mode, effectively overclocking the CPU from 67MHz to 133MHz. This change can remove slowdowns and improve framerate in some games, but can add instability in several others.
==Xbox==
On real hardware some people changing xbox cpu with tualatin pentium III and upgrading RAM to 128mb (just like [[Development Kits]]) for [https://youtu.be/c66hfqw4SKc?t=456 low frame rate games like Half-Life 2].
For emulators it's possible to use 128MB RAM and also overclock emulated CPU thanks to this [https://github.com/xemu-project/xemu/pull/1467 pull request] for xemu.
==References==
