I'd appreciate if someone is willing to contribute or upload latest binaries. But if you are releasing somewhere else (with or without your own modifications), be sure you are complying with GPL v2 license and include necessary warnings for users.

DISCLAIMER: USE AT YOUR OWN RISK!

Overclocking in general (often combined with overvolting and overheating) will degrade internal components - SoC, VRM(Voltage Regulator Module), Battery, etc. - faster than you and the manufacturer have expected.
There is no dynamic frequency scaling in HOS, which makes overclocking acts differently than PC or other mobile devices. The console will be sticking to what frequency you've set in the long term, until you close the game or put it into sleep.
Higher RAM clocks without proper timings could be UNSTABLE and cause graphical glitches / instabilities / filesystem corruption. Always make backup before usage.

Features

DRAM Overclock
- Most games are bottlenecked by RAM bandwidth
- Safe:
  - Mariko: 1996.8 MHz has been tested stable for all (Samsung / Micron / Hynix), with built-in timing auto-adjustment.
  - Erista: 1862.4 MHz.
- Unsafe: > 1996.8 MHz or overvolting
  - Timing:
    - Timing parameters could be auto-adjusted (default) or overwritten with user-provided mtc table.
    - Customization: No GUI tool, requires rebuilding.
  - DRAM bus overvolting (Erista Only).
    - Mariko: use this to set DRAM bus voltage.
System Settings (Optional)
TinyMemBenchNX: DRAM throughput and latency test based on tinymembench
MemTesterNX: A userspace utility for testing DRAM faults and stability based on memtester
- Now with multi-thread support and "stress DRAM" option, it should be able to test DRAM stability with adjusted timings.

Mariko Only

CPU/GPU Overclock
- Safe: CPU/GPU @ 1785/921 MHz (HOS maximum)
  - It has been proved safe without charger (not reaching battery power draw threshold)
- Unsafe: CPU/GPU @ 2397/1305 MHz
  - Why NOT RECOMMENDED?
    - See Current Flow in sys-clk-OC overlay Miscellaneous (on battery) or measure power draw from charger yourself.
    - Currently, there are no protective measures from heavy power draw.
  - CPU: 2397 MHz @ 1220 mV (overvolting from 1120 mV)
    - NVIDIA Official Maximum: 1963.5 MHz
    - Maximum performance depends on CPU speedo.
      - You'd get somewhere between 2360 to 2390 MHz performance for real.
    - This is where floating point performance maxed out.
    - ≥ 2193 MHz will ENABLE OVERVOLTING.
  - GPU: 1305 MHz (no overvolting, less than official threshold 1050 mV)
    - NVIDIA Official Maximum: 1267.2 MHz
    - ~~Tested with deko3d compute shaders converted from Maxwell SASS assembly. Single-precision floating point (FP32 FFMA) performance maxes out at 1305 MHz.~~
    - 1305 MHz CANNOT be set without charger connected.
Modded sys-clk and ReverseNX(-RT)
- No need to change clocks manually after toggling modes in ReverseNX (Optional)
  - To disable this feature, use original version of ReverseNX-RT and remove /config/sys-clk/ReverseNX_sync.flag.
- Auto-Boost CPU for faster game loading (Optional)
  - Enable CPU Boost (1785 MHz) when CPU Core#3 (System Core) is stressed, especially when the game is loading assets from eMMC/SD card (I/O ops).
  - Auto-Boost will be enabled only when charger is connected.
  - To disable this feature, remove /config/sys-clk/boost.flag.
- Permanent global clock override
  - Expected usage: set maximum DRAM clocks for all games and profiles.
- View charger & battery info, toggle charging/fast-charging(2A) in overlay
  - Extend battery life expectancy by maintaining battery charge at 40% - 60% and disabling fast charging if possible.
  - Known issue: Fast charging toggle will be reset in-game.

Installation

Download latest release.
Mariko Only: Copy all files in SdOut to the root of SD card.

Erista: Use official sys-clk instead. Only loader.kip and some benchmark homebrew are available.

Grab x.x.x_loader.kip for your Atmosphere version, rename it to loader.kip and place it in /atmosphere/kips/.

Customization

Defaults	Mariko	Erista
CPU OC	2397 MHz Max	Disabled
CPU Volt	1220 mV Max	Disabled
GPU OC	1305 MHz Max	N/A
RAM OC	1996 MHz Max	1862 MHz Max
RAM Volt	N/A	Disabled
RAM Timing	Auto-Adjusted	Disabled

No parser/editor currently, although you could easily customize those with a hex editor:
- Search for ASCII string CUST
- All values are little-endian
- Switch to override or replace mode, NOT insert mode
- See ldr_oc_suite.hpp for config struct

Hekate-ipl bootloader
- Rename the kip to loader.kip and add kip1=atmosphere/kips/loader.kip in bootloader/hekate_ipl.ini
- Erista: Minerva module conflicts with HOS DRAM training. Recompile with frequency changed is recommeded, although you could simply remove bootloader/sys/libsys_minerva.bso.
Atmosphere Fusee bootloader:
- Fusee will load any kips in /atmosphere/kips/ automatically.

Build

Grab necessary patches from the repo, then compile sys-clk, ReverseNX-RT and Atmosphere loader with devkitpro.

If you are to install nro forwarders, remove R_TRY(ValidateAcidSignature(std::addressof(g_original_meta_cache.meta))); in Atmosphere/stratosphere/loader/source/ldr_meta.cpp to make them work again.

Uncompress the kip to make it work with config editor: hactool -t kip1 Atmosphere/stratosphere/loader/loader.kip --uncompress=Atmosphere/stratosphere/loader/loader.kip

Why no CPU/GPU OC for Erista?

Tegra X1 on Erista is on TSMC 20nm HPM node, consumes much more power (~2x) and generates much more heat, compared to Tegra X1+ on Mariko (TSMC 16nm FinFET).
- Erista Switch uses lower speedo (=== lower quality === higher voltage required) SoC from NVIDIA. You will NOT get comparable performance to NVIDIA Shield TV no matter what.
- Snapdragon 810 (4 x A57 @ 2.0GHz + 4 x A53) also uses 20nm HPM, see how it plagued Android phones in 2014.
The board power supply is quite limited, even if you've done cooling mod.
- You could spot battery draining at higher clocks under stress test, even with official 39W PD charger.
- CPU / GPU performance at max clocks will be worse if power supply is not enough.
CPU OC (up to ~ 2.1 GHz, depending on your CPU bin) is available mainly for emulation, but it does NOT work out of the box.

Acknowledgement

CTCaer for Hekate-ipl bootloader, RE and hardware research
devkitPro for All-In-One homebrew toolchains
masagrator for ReverseNX-RT and info on BatteryChargeInfoFields in psm module
Nvidia for Tegra X1 Technical Reference Manual
RetroNX team for sys-clk
SciresM and Reswitched Team for the state-of-the-art Atmosphere CFW of Switch
Switchbrew wiki for Switch in-depth info
ZatchyCatGames for RE and original OC loader patches for Atmosphere

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