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⚠️ Disclaimer

THIS TOOL CAN BE DANGEROUS IF MISUSED. PROCEED WITH CAUTION. Due to the design of Horizon OS, overclocking RAM can cause NAND OR SD CORRUPTION. Ensure you have a full NAND, PRODINFO, EMUMMC and SD backup before proceeding.

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About

Horizon OC is an open-source overclocking tool for Nintendo Switch consoles running Atmosphere custom firmware. It enables advanced CPU, GPU, and RAM tuning with user-friendly configuration tools.

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Default clocks

• CPU: 1963MHz (Mariko) / 1785MHz (Erista)
• GPU: 1152MHz (Mariko) / 921MHz (Erista)
• RAM: 2133MHz (Mariko) / 1600MHz (Erista)
• Over/undervolting support
• Built-in configurator
• Compatible with most homebrew

It is recommended to read the guide before proceeding, as this can help you get a significant performance boost over the default settings, often times with less power draw and heat output

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Installation

1. Ensure you have the latest versions of

   • Atmosphere
   • Ultrahand Overlay

2. Download and extract Horizon OC to the root of your SD card.

3. If using Hekate, edit hekate_ipl.ini to include:

   kip1=atmosphere/kips/hoc.kip
   secmon=atmosphere/exosphere.bin
   

   (No changes needed if using fusee.)

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Configuration

1. Open the Horizon OC Overlay
2. Open the settings menu
3. Adjust your overclocking settings as desired. A helpful guide can be found here.
4. Click Save KIP Settings to apply your configuration.

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Donating

We don't accept donations. Put your spare cash into a charity instead :)

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Building from Source

Refer to COMPILATION.md

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Higher clocks are achievable via undervolting or further configuration, refer to this table for more details. The averages are only for reference. Each ram is different and must be tuned independently. Refer to the guide for more details!

Clock table

MEM clocks (mhz)

• 3400 → max on mariko.
• 3366
• 3333
• 3300
• 3266
• 3233
• 3200 → JEDEC, Hynix NEE/x267 Average
• 3166
• 3133 → Micron WT:B Average
• 3100
• 3066
• 3033
• 3000
• 2966
• 2933 → JEDEC.
• 2900
• 2866
• 2833 → Samsung AA-MGCL Average
• 2800
• 2766
• 2733 → Samsung AM-MGCJ/Micron WT:E Average
• 2700
• 2666 → JEDEC, Micron WT:F Average
• 2633
• 2600
• 2566 → Samsung AB-MGCL Average
• 2533
• 2500
• 2466
• 2433
• 2400 → max on erista, JEDEC, Hynix NME Average
• 2366
• 2333
• 2300
• 2266
• 2233
• 2200
• 2166
• 2133 → Mariko JEDEC standard max (4266 Modules)
• 2100
• 2066
• 2033
• 2000
• 1996 → JEDEC, Erista Average
• 1966
• 1933
• 1900
• 1866 → Mariko JEDEC standard max (3733 Modules)
• 1833
• 1800
• 1766
• 1733
• 1700
• 1666
• 1633
• 1600 → official docked, boost mode, Erista JEDEC standard max (3200 Modules), JEDEC.
• 1331 → official handheld, JEDEC.
• 1065 → Erista only
• 800 → Erista only
• 665 → Erista only
• 408 → Erista only
• 204 → sleep mode
• 102 → Erista only
• 68 → Erista only
• 40 → Erista only

CPU clocks (mhz)

• 2805 → mariko absolute max, dangerous
• 2703
• 2601 → unsafe
• 2499
• 2397 → mariko safe max with UV (low speedo)
• 2295
• 2193
• 2091
• 1963 → mariko no UV max clock
• 1887
• 1785 → erista no UV max clock, boost mode
• 1683
• 1581
• 1428
• 1326
• 1224 → sdev oc
• 1122
• 1020 → official docked & handheld
• 918
• 816
• 714
• 612 → sleep mode

GPU clocks (mhz)

• 1574 → absolute max clock on mariko. Dangerous
• 1536
• 1497 → max mariko unsafe clock
• 1459
• 1420
• 1382 → Max mariko "safe" clock
• 1344
• 1305
• 1267 → NVIDIA T214(mariko) rating
• 1228 → mariko High UV safe clock
• 1152 → mariko hiOpt-15mV max clock
• 1075 → mariko hiOpt max clock. absolute max clock on erista. very dangerous
• 998 → NVIDIA T210 (erista) rating
• 960 (erista only) → erista high uv/hiOpt-15mV safe max clock
• 921 → erista no UV max clock
• 844
• 768 → official docked
• 691
• 614
• 537
• 460 → max handheld
• 384 → official handheld
• 307 → official handheld
• 230
• 153
• 76 → boost mode

Notes:

1. On Erista, CPU in handheld is capped to 1581MHz
2. GPU overclock is capped at 460MHz on erista in handheld
3. On Mariko, cap with hiOpt is 614MHz, with hiOpt-15mV it is 691MHz and with High UV it's 768MHz
4. Clocks higher than 768MHz on erista need the official charger is plugged in.

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Credits

• Lightos's Cats - Cats
• Souldbminer - hoc-clk and loader development
• Lightos - Loader patches development, hoc-clk development, guides
• HAZEL - Perfect DRAM timings help
• TDRR - HOC Logo Design
• tetetete-ctrl - Website design
• SciresM - Atmosphere CFW
• CTCaer - L4T, Hekate, proper RAM timings
• KazushiMe - Switch OC Suite
• Hanai3bi (Meha) - Switch OC Suite, EOS, sys-clk-eos
• NaGaa95 - L4T-OC kernel, Status Monitor fork
• B3711 (halop) - EOS, contributions
• sys-clk team (m4xw, p-sam, natinusala) - sys-clk
• Dominatorul - Soctherm driver, guides, general help
• ppkantorski - Ultrahand sys-clk & Status Monitor fork
• MasaGratoR and ZachyCatGames - General help
• MasaGratoR - Status Monitor & Display Refresh Rate driver
• Dominatorul, Samybigio, Arcdelta, Miki, Happy, Winnerboi77, Blaise, Alvise, agjeococh, frost, letum00, and Xenshen - Testing
• Samybigio2011, Miki - Italian translations
• angelblaster - Korean translations
• q1332348216-glitch, nangongjing1, xinluochenjiang - Chinese translations
• th3-ne0undr5c0r - French translations
• redraz - Russian translations
• Niklas080208 - JSON language support for sysmodule notifications.
• Nvidia - Tegra X1 Technical Reference Manual, soctherm driver, L4T