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PCSX2 uses All recent builds have a speed hack that allows you to increase the EE cycle-rate without having any effect on the CPU clock as audio, although it does still break a base few games most of them run fine and divides for GPU clockrate, so overclocking will result in visual problems too, as well as sped up audio. [http://www.mediafire.com/download/u204iktybl9z2t4/Pcsx2_OC.rar PCSX2 OC Builds]with less slowdown. The emulator also has a speed hack called VU Cycle Stealing, which allows for increased GPU performance at the cost of CPU cycles. It gives an incorrect FPS readout, though.
Updating the PS1 and PS2 info
| style="text-align: center;"|33.8 MHz
| style="text-align: center;"|Yes<ref name="kraut">https://www.youtube.com/watch?v=HapnSOseDfw</ref>
| style="text-align: center;"|NoYes
| style="text-align: center;"|66Mhz<ref name="kraut"/>
|-
Dolphin used to have a VBeam Speed Hack that doubled GPU clock rate. This has since been removed, as the developers found that it didn't really help in any cases.
==PlayStation==
On real hardware overclocking is possible using [http://djky2k3.tripod.com/psx_oc.html this modification].
On emulator only [https://github.com/SonofUgly/PCSX-Reloaded/releases this modified build] of PCSX-R allows for overclocking, most games will break past 1.5x clock-speed.
==PS2==
On original model PS2s you can overclock by a small amount without too much problem, the biggest issue will be sped up audio. Slim model PS2s use the GPU's clockrate as a base for the CPU (multiplying the GPU's clock by 2), so overclocking the CPU will also overclock the GPU resulting in many visual problems.<ref name="PS2OC">http://nfggames.com/forum2/index.php?topic=2220.0</ref>
==PSP==
