sys-clk

Switch sysmodule allowing you to set cpu/gpu/mem clocks according to the running application and docked state.

Installation

The following instructions assumes you have a Nintendo Switch running Atmosphère, updated to at least the latest stable version. Copy the config and atmosphere folder at the root of your sdcard, overwriting files if prompted.

Relevant files

• Config file: allows one to set custom clocks per docked state and title id, described below

  /config/sys-clk/config.ini

• Log file: where the log are written if enabled

  /config/sys-clk/log.txt

• Log flag file: enables log writing if file exists

  /config/sys-clk/log.flag

Config

Presets can be customized by adding them to the ini config file located at /config/sys-clk/config.ini, using the following template for each app:

[Application Title ID]
docked_cpu=
docked_gpu=
docked_mem=
handheld_charging_cpu=
handheld_charging_gpu=
handheld_charging_mem=
handheld_charging_usb_cpu=
handheld_charging_usb_gpu=
handheld_charging_usb_mem=
handheld_charging_official_cpu=
handheld_charging_official_gpu=
handheld_charging_official_mem=
handheld_cpu=
handheld_gpu=
handheld_mem=

• Replace Application Title ID with the title id of the game/application you're interested in customizing. A list of games title id can be found in Switchbrew wiki.
• Frequencies are expressed in mhz, and will be scaled to the nearest possible values, described in the clock table below.
• If any key is omitted, value is empty or set to 0, it will be ignored.
• If charging, sys-clk will look for the frequencies in that order, picking the first found:
  • Charger specific config (USB or Official): handheld_charging_usb_X or handheld_charging_official_X
  • Non-specific charging config: handheld_charging_X
  • Handheld config: handheld_X

Example 1: Zelda BOTW

• Overclock CPU when docked or charging
• Overclock MEM to docked clocks when handheld

Leads to a smoother framerate overall (ex: in the korok forest)

[01007EF00011E000]
docked_cpu=1224
handheld_charging_cpu=1224
handheld_mem=1600

Example 2: Picross

• Underclocks on handheld to save battery

[0100BA0003EEA000]
handheld_cpu=816
handheld_gpu=153
handheld_mem=800

Clock table (MHz)

RAM clocks

• 1600 -> official docked, max clock
• 1331 -> official handheld
• 1065
• 800
• 665

CPU clocks

• 1785 → max clock, will cause instability in certain configurations
• 1683
• 1581
• 1428
• 1326
• 1224 → sdev oc
• 1122
• 1020 → official docked & handheld
• 918
• 816
• 714
• 612

GPU clocks

Notes:
-GPU overclock is capped at 460 if handheld
-Clocks higher than 768MHz need the official charger

• 921 → max clock
• 844
• 768 → official docked
• 691
• 614
• 537
• 460 → max handheld
• 384 → official handheld
• 307 → official handheld
• 230
• 153
• 76