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.
Higher RAM clocks without proper timings could be UNSTABLE and cause graphical glitches / instabilities / filesystem corruption. Always make backup before usage.
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.

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: higher than 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
  - Without chargers, CPU/GPU would be capped @ 1963/921 MHz or -/460 MHz (Emulator mode).
  - Without official chargers, GPU would be capped @ 1267 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.~~
Modded sys-clk and ReverseNX(-RT)
- Permanent global clock override
  - Expected usage: set maximum DRAM clocks for all games and profiles.
- Miscellaneous
  - Auto CPU Boost: For faster game loading
    - Enable CPU Boost (1785 MHz, could be configured higher) 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.
  - Sync ReverseNX Mode: No need to change clocks manually after toggling modes in ReverseNX
  - 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 Boost	1785 MHz	N/A
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

Loader configurator
- Grab ldr_config.py and modify values in cust_conf dict.
- python ldr_config.py loader.kip -s will save your configuration in-place.

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

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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