Horizon OC Switch

Horizon OC
Horizon OC
General
Author	Souldbminer
Type	Sysmodules
Version	2.4.1
License	GPL-2.0
Last Updated	2026/06/06
Links
	Download
	Website
	Source

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.

Disclaimer warning - This tool can be dangerous if misused. Due to the design of Horizon OS, overclocking RAM can cause NAND or SD corruption, so it is advised to have a full NAND, PROINFO, EMUMMC and SD backup before proceeding.

Default clocks

CPU clocks up to 1963MHz (Mariko) / 1785MHz (Erista)
GPU clocks up to 1075MHz (Mariko) / 921MHz (Erista)
RAM clocks up to 1866/2133MHz (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

Installation

Ensure you have the latest versions of Atmosphere Switch and Ultrahand Overlay Switch.
Download and extract the Horizon OC Package to the root of your SD card.
If using Hekate, edit hekate_ipl.ini to include:

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

No changes are needed if using fusee.

Configuration:

Open the Horizon OC Overlay.
Open the settings menu.
Adjust your overclocking settings as desired.
Click Save KIP Settings to apply your configuration.

Clock table

MEM clocks (mhz)

3200 → max on mariko, JEDEC.
3166
3133
3100
3066
3033
3000
2966
2933 → JEDEC.
2900
2866
2833
2800
2766
2733
2700
2666 → JEDEC.
2633
2600
2566
2533
2500
2466
2433
2400 → max on erista, JEDEC.
2366
2333
2300
2266
2233
2200
2166
2133 → Mariko JEDEC standard max (4266 Modules)
2100
2066
2033
2000
1996 → JEDEC standard
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
800
665

CPU clocks (mhz)

2703 → mariko absolute max, dangerous
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)

1536 → absolute max clock on mariko. very dangerous
1459
1382
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:

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

Changelog

Horizon OC 2.4.1

Bugfix update.

Horizon OC 2.4.0
ldr:

Erista: Mariko-style MRF for Erista; Timing tBreak is also present; t2 tRP cap is unnecessary; improved write timings.
Mariko: added GPU boot voltage patch (experimental); new DVB table (thanks B3711).

hoc-clk:

Edge cases with Mariko middle freqs have been corrected.
Removed handheld TDP (it's problematic).
DVFS for Erista.
Improved UI with graphs and such.
Auto CPU RAM OC: automatically overclock CPU to meet higher vmin requirement when RAM clock is high.
KIP migration: updates are automatically migrated; drag, drop and reboot twice (if updating from 2.4.0 release candidates you must reset your settings).
Input current override (by Miki): allows overwriting the input current to the board (experimental, use with caution).

Horizon OC 2.3.1
ldr (Mariko only):

DVB table changes: fixed an issue where higher voltage was used than needed; DVB voltage table was significantly improved (thanks to halop and jimmy_f); it is recommended to retest your DVB, which should be much tighter and only need around DVB 2-4; this leads to a lower voltage spread at lower freqs, potentially saving ~0.3W.
CPU voltage patches now use the CvbMeta struct on Mariko rather than hardcoding offsets.

hoc-clk:

Display voltage is now read from i2c instead of rgltr.
An info section was added; press Y on various settings (e.g. vdd2) to receive more information.
A resolution read bug was fixed.
Experimental: Erista live CPU UV was improved.

Horizon OC 2.3.0
ldr:

DVB table has been significantly improved; far less DVB shift is required for high RAM clocks to function now; DVB range has been changed to -4 to 8; if your DVB is >8 it will be automatically changed to fit the new range.

hoc-clk:

An edge case with middle freqs has been corrected.
An OOM error was fixed.

For developers:

CUST_REV has been changed to 3; emcDvbShift is now a s32; KIP_VERSION is now 230; there are no context layout changes in this version.

Horizon OC 2.2.0
ldr:

An edge case with MRF was fixed where 1333 latency wasn't being applied.
An issue was fixed that prevented booting at 1600MHz max clock.
KIP version is now stored in the cust struct.
An extremely specific timing edge case with tRC was fixed.

hoc-clk:

Previously unused display color options on OLED are now available.
Memory usage was significantly reduced.
Fixed an issue that caused an unintended clock reset.
GPU RAM OC DVFS logic was improved.
The aotag driver from L4T was ported to HOS (requires a patched exosphere binary, included in the release; used to calculate more accurate memory temps on Mariko, while Erista keeps using its memory sensors; the formula is an estimation).
On very select consoles, exiting boost mode can trigger the CPU voltage bug; this issue has been mitigated.
A French translation by th3-ne0undr5c0r and a Russian translation by redraz were added.
KIP version is now checked and will detect potential outdated kips/sysmodule.
A stable struct was added to HocClkContext (will remain unchanged in future updates; useful for developers; includes target freqs, real freqs, override freqs, temperatures including tsensor, power draw, part load, and voltages).
Cust version check was fixed.
Speedos and other hardware info are now read directly from fuses.
DVFS voltage brackets were improved (thanks to jontomy).
hoc-clk code was refactored again.
Wafer coordinate readings were fixed.
A notification icon is now included (thanks ppkantorski).
Experimental: middle freqs were added to Mariko via the gm20b driver.
The build process was significantly improved.

Horizon OC Gaea 2.1.0
ldr:

Added SOC voltage uncap patch (allows higher SoC voltage for those limited by it).
Added 133MHz step mode (RAM clocks are stepped by 133MHz in this mode: 1600, 1733, 1866, 2000, 2133, etc.).

hoc-clk:

Configurator rework (many items now use trackbars; names updated to reflect the latest ones; added support for newest features).
BQ24193 temperature driver (temperature visible in the about section).
DVFS improvement for low freqs (thanks B3).

hoc-monitor:

Bugfixes.

Horizon OC Gaea 2.0.2

hoc-clk: Fixed crash upon opening the governor submenu.

Horizon OC 2.0.1

ldr: Fixed an mtcTable pointer that was incorrectly being updated, which was mostly harmless but caused freezes on 8GB modules and potential instability on other RAM modules.
hoc-clk: Display undervoltage is no longer shown on OLED due to increasing power draw.

Horizon OC 2.0.0

ldr: Multiple RAM frequencies were added to Mariko (configurable via step mode, latency max and other options); T2 cap added for 1333WL; timing tbreak and low t7/t6 added; an auto latency mode or the ability to deactivate certain latencies entirely is included; IRAM logging is now available on Erista (not on Mariko due to IRAM getting cleared).
hoc-clk: RAM usage reduction added; RAM PLL measurement added to experimental settings; KIP changes are now automatically saved; minimum GPU Vmin for Erista lowered to 675mV; minimum display voltage lowered to 800mV; RAM bandwidth added; option to display MT/s added; overlay UI updated for MRF support; various other minor UI changes; logging improved; Spanish translation improved by TDRR.
Hoc-monitor: Temp reading bugs fixed; recompiled with latest libultrahand; bandwidth toggle added.

Horizon OC 1.2.1

ldr: Recompiled for AMS 1.11.1 support; a CPU clock capping bug was fixed.
hoc-clk: Italian translation improved by Miki; a CPU clock capping bug was fixed; display undervoltage added; alignment improved.
Hoc-monitor: Fixed a minor bug with mini monitor that resulted in brief garbage reads; default font size reduced.

Horizon OC 1.2.0

hoc-clk: Soctherm added (enables CPU, GPU, pllx and memory temperature sensors; memory unavailable on Mariko, where pllx is used instead); hoc-clk rewritten for a cleaner code structure; Korean translation by angelblaster added; Chinese translation by q1332348216-glitch added; a VRR bug fixed; GPU UV options renamed to reflect their proper names from EOS (default is now hiOpt, slt is now hiOpt-15mV, hiOpt is now called High UV); minor UI changes.
Hoc-monitor: Now based on NaGa's status-monitor pro fork; supports real temps.
ldr: Recompiled against Atmosphere 1.11.0; loader-based auto vmin from EOS was removed as it was incorrectly implemented.

Horizon OC 1.1.0

hoc-clk: Improved governor configuration; display refresh rate changes and support on Lite; fixed CPU Min Hz for governor; slight reworks for handheld TDP; added translations (machine made, likely not accurate); reading of the game resolution; removal of redundant profile options; reading of wafer cord; fixed IDDQ; support for Retro Remake displays (WIP, enabled by creating retro.flag in config/horizon-oc); 75Hz max refresh rate.

Horizon OC 1.0.2

Incorporated Traditional Chinese into the overlay (by nangongjing1).
Loader: Added panic codes; added GPU vmax validators (800-960 mV); Erista cpuDvfsTable max is now 2091MHz (any UV, no CPU unlock).
Hoc-clk: Fixed a config error; fixed a DVFS bug when resetting to 1600MHz that resulted in hangs.
Hoc-monitor: Updated with latest changes.

Horizon OC 1.0.1

Fixed a boot issue where it wasn't using the default configs.
Fixed minimum CPU governor clock.

Horizon OC 1.0.0

Loader: Erista support finalized (several MRF crashes addressed, CPU UV fixed, CPU Vmin fixed, 2397MHz CPU added with usage not recommended); Mariko CPU maximum VMAX lowered to 1200mV.
hoc-clk: Display options on Lite removed; various RAM OC DVFS fixes; display OC bugfixes; governor reworked; SaltyNX running is now displayed in the overlay; heavily simplified VRR added (not available on Lite); CPU governor is no longer experimental.
Overlay: UI redesign; CPU Vmin on Erista now only adjustable in 25mV steps; RAM module now shown in the "About" menu.
Horizon-OC-Monitor: A padding bug fix from the upstream repo was merged.
Note: After updating, the config file must be deleted before booting into Atmosphere.

Horizon OC 0.41 (Beta 5)

hoc-clk: Fixed bug where GPU frequencies weren't being applied; fixed bug with incorrect clock capping in the configurator; UI reordered for smoother scrolling; mitigated CPU voltage bug with boost mode; fixed an issue with scheduling no override where the ini key was being deleted.
Loader (Erista): Fixed various table issues with multiple RAM frequencies; fixed slight timing mistakes.

Horizon OC Zeus 0.40 (Beta 4)

hoc-clk: CPU Governor; GPU scheduling toggle via INI; more detailed governor settings; 240Hz Display Overclock for OLED consoles with sys-dock; memory usage optimizations; removing an override now resets frequency to stock; experimental on-the-fly CPU undervolt (also on Erista), unlocked via enable_experimental_settings=1.
No changes to ldr.

Horizon OC Zeus 0.38 (Beta 2) (Mariko only)

Fixed DVFS profile change bug; fixed CPU bug fully; fixed real freq display bug; removed charge current override from overlay (still settable in ini); deprecated exosphere patch.

Horizon OC Zeus 0.37 (Beta 1) (Mariko only)

T6 fine tuning added (not compatible with live timings updates); hijack DVFS from sys-clk-eos added (including DVFS offsets updatable on the fly); "Budget DVFS" removed as obsolete; support with 8GB modules confirmed working.

0.36 (Alpha 16) (Mariko only)

T7 slightly adjusted; a new advanced config section added allowing precise tuning of T7.

0.35 (Alpha 15) (Mariko only)

Loader (Mariko): "Budget DVFS" added (auto RAM vmin); new RAM timings added. Erista: implemented latency scaling.
Hoc-clk: Reworked clock capping; adjusted display safety; various UI changes.

Horizon OC Zeus 0.34 (Alpha 14)

Proper GitHub Actions build (by OEMunlag); README update (by Blaise-25).

Horizon OC Zeus 0.33 (Alpha 13)

See full changelog (0.32...0.33).

0.32 (Pre-release)

See full changelog (0.31...0.32).

0.31 (Alpha 11) (Mariko only, Pre-release)

Hoc-clk: CPU voltage bug fixed; base latency order changed to ascending; other minor UI changes.
Loader: Fixed an issue with timings being miscalculated at 1333 base latency (affected >=2533).

0.30 (Alpha 10) (Mariko only, Pre-release)

Hoc-clk: A settings bug was fixed.
Loader (Mariko): Improved DRAM timings (2133 tWRL improved, 1866 and 1600 read/write latency now works). Erista: fixed typo in GPU vmin patches.

Horizon OC Zeus 0.29 (Alpha 9) (Pre-release)

See full changelog (0.27...0.29).

Horizon OC Zeus 0.27 (Alpha 7) (Pre-release)

See full changelog (0.26...0.27).

Horizon OC Zeus 0.26 (Alpha 6) (Pre-release)

Initial GitHub Release.

Credits

Lightos's Cat - Cat
Souldbminer - hoc-clk and loader development
Lightos - Loader patches development, hoc-clk development, guides
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 - Chinese translations
th3-ne0undr5c0r - French translations
Nvidia - Tegra X1 Technical Reference Manual, soctherm driver, L4T

External links