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− | Overclocking is the process by which the CPU | + | Overclocking is the process by which the CPU clockspeed is increased. The reason for doing this would be to reduce slowdown in games, or to increase the framerate. However, as this is a hack and not intended by designers, it can result in many issues. Certain systems can have an overclocked CPU with few if any issues, while others can not overclock without major issues. |
==Chart== | ==Chart== | ||
− | {| class="wikitable | + | {| class="wikitable" |
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− | ! scope="col"|System | + | ! scope="col" style="text-align: center;"|System |
− | ! scope="col"|Normal clock | + | ! scope="col" style="text-align: center;"|Normal clock |
− | ! scope="col"|Hardware Overclock | + | ! scope="col" style="text-align: center;"|Hardware Overclock |
− | ! scope="col"|Emulation Overclock | + | ! scope="col" style="text-align: center;"|Emulation Overclock |
− | ! scope="col"|Overclock levels | + | ! scope="col" style="text-align: center;"|Overclock levels |
|- | |- | ||
− | |[[Nintendo Entertainment System emulators|NES]] | + | | style="text-align: center;"|[[Nintendo Entertainment System emulators|NES]] |
− | |1.79 MHz | + | | style="text-align: center;"|1.79 MHz |
− | | | + | | style="text-align: center;"|Yes |
− | | | + | | style="text-align: center;"|No |
− | | | + | | style="text-align: center;"|? |
|- | |- | ||
− | |[[Super Nintendo emulators|SNES]] | + | | style="text-align: center;"|[[Super Nintendo emulators|SNES]] CPU |
− | |3.58 MHz | + | | style="text-align: center;"|3.58 MHz |
− | | | + | | style="text-align: center;"|Yes |
− | | | + | | style="text-align: center;"|No |
− | | | + | | style="text-align: center;"|? |
|- | |- | ||
− | |[[Super Nintendo emulators|SNES]] | + | | style="text-align: center;"|[[Super Nintendo emulators|SNES]] SFX1 |
− | |10.5 MHz | + | | style="text-align: center;"|10.5 MHz |
− | | | + | | style="text-align: center;"|Yes |
− | | | + | | style="text-align: center;"|Yes |
− | |40-60 Mhz | + | | style="text-align: center;"|40-60 Mhz |
|- | |- | ||
− | |[[Super Nintendo emulators|SNES]] | + | | style="text-align: center;"|[[Super Nintendo emulators|SNES]] SFX2 |
− | |21 MHz | + | | style="text-align: center;"|21 MHz |
− | | | + | | style="text-align: center;"|Yes |
− | | | + | | style="text-align: center;"|Yes |
− | |40-60 Mhz | + | | style="text-align: center;"|40-60 Mhz, |
|- | |- | ||
− | |[[ | + | | style="text-align: center;"|[[Mega Drive]] |
− | |7.7 MHz | + | | style="text-align: center;"|7.7 MHz |
− | | | + | | style="text-align: center;"|Yes<ref name="kyorune">http://kyorune.com/modding/article.php?id=73</ref> |
− | | | + | | style="text-align: center;"|No |
− | |13.1-25.4 MHz<ref name="kyorune"/> | + | | style="text-align: center;"|13.1-25.4 MHz<ref name="kyorune"/> |
|- | |- | ||
− | |[[ | + | | style="text-align: center;"|[[PlayStation]] |
− | | | + | | 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;"|No |
− | | | + | | style="text-align: center;"|66Mhz<ref name="kraut"/> |
|- | |- | ||
− | |[[ | + | | style="text-align: center;"|[[Sega Saturn]] |
− | | | + | | style="text-align: center;"|28.6 MHz* |
− | | | + | | style="text-align: center;"|No |
− | | | + | | style="text-align: center;"|No |
− | | | + | | style="text-align: center;"|- |
|- | |- | ||
− | |[[ | + | | style="text-align: center;"|[[Nintendo 64]] |
− | | | + | | style="text-align: center;"|93.75 MHz |
− | | | + | | style="text-align: center;"|Yes<ref name="n64oc">http://www.gamesx.com/misctech/n64oc.htm</ref> |
− | | | + | | style="text-align: center;"|Yes |
− | | | + | | style="text-align: center;"|125-187.5 Mhz<ref name="n64oc"/> |
|- | |- | ||
− | | | + | | style="text-align: center;"|[[Neo Geo]] |
− | + | | style="text-align: center;"|12 MHz | |
− | + | | style="text-align: center;"|Yes<ref name="neooc">http://www.neo-geo.com/forums/showthread.php?158016-68K-s-guide-to-overclocking-your-Neo-Geo-AES</ref> | |
− | + | | style="text-align: center;"|Yes | |
− | + | | style="text-align: center;"|14-18 MHz<ref name="neooc"/> | |
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− | |[[ | ||
− | |12 MHz | ||
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− | | | ||
− | |14-18 MHz<ref name="neooc"/> | ||
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|} | |} | ||
− | <nowiki>*</nowiki> Sega Saturn has two SH-2 CPUs | + | <nowiki>*</nowiki>Sega Saturn has two SH-2 CPUs |
− | == | + | ==Famicom (NES)== |
− | + | Since so many graphical tricks in famicom games are based on extremely careful timing (even things as mundane as the status bars in games like The Legend of Zelda), overclocking would likely cause many graphical issues. It is likely for this reason that there is no Famicom emulator that has overclocking options. | |
− | == | + | ==SNES== |
− | + | ===Main CPU=== | |
+ | The main SNES CPU ran at 3.58 MHz and can be overclocked. However it causes issues. With those who have tested it, the following issues occur: | ||
− | + | *"4.1 MHz: Small amounts of sprite breakup occasionally; very little slowdown. | |
− | + | *5.1 MHz: Sprite breakup; no slowdown | |
− | + | *6.6 MHz: Color palette errors; sprites fail to render | |
− | + | *7.6 MHz: Color palette errors; sprites fail to render. Freezes after a few minutes."<ref name="SNES overclock">http://web.archive.org/web/20070629163744/http://www.undergroundcm.com/index.php?option=com_content&task=view&id=15&Itemid=38</ref> | |
− | + | There are no SNES emulators that allow for an overclocking option, likely because of those issues. | |
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− | + | ===SFX chip=== | |
− | + | The first version of the chip, commonly referred to as simply "Super FX", is clocked with a 21 MHz signal, but an internal clock speed divider halves it to 10.5 MHz. Later on, the design was revised to become the Super FX GSU-2; this, unlike the first Super FX chip revision, is able to reach 21 MHz. | |
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− | + | The SFX chip however can be overclocked with fewer issues on real hardware or emulation. It does however increase the speed of the game as well. | |
− | The | ||
− | + | Tests have shown that overclocking can increase the speed of the game, in addition to increasing the framerate and removing slodown.<ref name="Dragon50hztest"> | |
+ | https://www.youtube.com/watch?v=tfNI3HpUt-4</ref> | ||
− | {| class="wikitable | + | {| class="wikitable" |
|- | |- | ||
− | ! scope="col"|Clock speed | + | ! scope="col" style="text-align: center;"|Clock speed |
− | ! scope="col"|Time | + | ! scope="col" style="text-align: center;"|Time |
− | ! scope="col"|Increase | + | ! scope="col" style="text-align: center;"|Increase |
|- | |- | ||
− | |Normal | + | | style="text-align: center;"|Normal |
− | |1'46'02 | + | | style="text-align: center;"|1'46'02 |
− | | | + | | style="text-align: center;"|------- |
|- | |- | ||
− | | | + | | style="text-align: center;"|50hz |
− | |1'23'78 | + | | style="text-align: center;"|1'23'78 |
− | |27.711%<ref name="Dragon50hztest"/> | + | | style="text-align: center;"|27.711%<ref name="Dragon50hztest"/> |
+ | |||
|} | |} | ||
− | + | [[RetroArch|Snes9x-Next]] allows for SFX overclocking. | |
− | + | PC-Engine (TG-16) | |
− | + | Overclocking the main CPU also has the effect of speeding up the audio as well.<ref>When you overclock the CPU, the audio speeds up as well.</ref> | |
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==N64== | ==N64== | ||
− | + | [[Mupen64Plus]] - VI Refresh | |
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==GameCube/Wii== | ==GameCube/Wii== | ||
− | [[Dolphin]] | + | [[Dolphin]] - VBeam Speed Hack doubles GPU clock rate. |
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==PS2== | ==PS2== | ||
− | + | [[PCSX2]] - VU Cycle Stealing allows for increased GPU performance at the cost of CPU cycles. | |
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==Neo Geo== | ==Neo Geo== | ||
− | + | Final burn alpha allows for overclocking of Neo Geo games. All Neo Geo should run at full speed when overclocked. | |
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− | == | + | ==Mega Drive== |
− | + | Can be overclocked leading to faster/smoother gameplay. | |
+ | http://www.youtube.com/watch?v=SVrElANZg2M | ||
− | + | No MegaDrive emulator currently supports overclocking. | |
− | + | The [[Genesis Plus GX]] dev says that implementing overclocking is "not easy to add without potentially break other things. "<ref>https://code.google.com/p/genplus-gx/issues/detail?id=223</ref> | |
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==References== | ==References== | ||
{{Reflist}} | {{Reflist}} | ||
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