Table of what the C-States do

Cliff S

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C-States are additive, meaning the current state, includes the ones above.
Example:
C5 includes everything from C1 to C4 also.

C StateNameWhat is it for
C0Operational statusThe processor is working to its full potential
C1StopIt stops the internal clocks of the processor, but the interfaces and APICs continue to function.
C1EImproved stopStops all internal clocks of the software processor.
C2Detention permitStops the internal and external clocks of the CPU by hardware. The interfaces and APICs continue to work.
C2Stop the clockStops the internal and external clocks of the CPU by hardware.
C2EExtended detention permitIt stops the main clocks and also reduces the CPU voltage to reduce power consumption. Interfaces and APICs continue to work.
C3SuspensionStops all internal clocks of the CPU.
C3Deep suspensionStops all internal and external clocks of the CPU.
C3AltVIDStops all internal clocks and lowers voltage.
C4Deep suspensionLower the CPU voltage.
C4E / C5Enhanced deep suspensionLower the voltage even further and turn off the memory cache.
C6Deep shutdownReduce the CPU voltage to zero.
C7Deep energy savingThe CPU flushes the L3 cache and cuts its power. The system agent power is also removed.
C7sSubstate in which the L3 cache is flushed suddenly rather than in stages. I / O devices are put into energy saving.
C8The L3 cache is flushed and power to the PLL is removed.
C9The VCC input voltage is minimized.
C10The CPU shuts down completely.

Read more here: C State on Intel Processors, What it is, How it Works and What it is for | ITIGIC
 

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Cliff S

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Even when overclocking, for daily use, gaming, rendering, encrypting, decrypting, large file compression/decompression and so on, you should leave all C-States on in BIOS/UEFI, so your system can clock down, reducing wattage and amperage, so the system runs cooler, hence quieter.

If you want to temporarily turn C-States off, for benchmarking for example, you can just switch from balance power to High Performance.

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My Computer

System One

  • Operating System
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu
    Computer type
    PC/Desktop
    Manufacturer/Model
    ۞ΞЖ†ԘΜΞ۞
    CPU
    Intel Core i9 9900K
    Motherboard
    ASUS ROG Maximus X Hero
    Memory
    32 GB Quad Kit, G.Skill Trident Z RGB Series schwarz, DDR4-3866, 18-19-19-39-2T
    Graphics Card(s)
    ASUS GeForce RTX 3090 ROG Strix O24G, 24576 MB GDDR6X
    Sound Card
    (1) HD Webcam C270 (2) NVIDIA High Definition Audio (3) Realtek High Definition Audio(UAD)
    Monitor(s) Displays
    BenQ BL2711U(4K) and a hp 27vx(1080p)
    Hard Drives
    C: Samsung 960 EVO NVMe M.2 SSD
    E: & O: Libraries & OneDrive-> Samsung 850 EVO 1TB
    D: Hyper-V VM's -> Samsung PM951 Client M.2 512Gb SSD
    G: System Images -> HDD Seagate Barracuda 2TB
    PSU
    Corsair HX1000i High Performance ATX Power Supply 80+ Platinum
    Case
    Phanteks Enthoo Pro TG
    Cooling
    Thermaltake Floe Riing RGB TT Premium-Edition 360mm and 2x120 Phantek& Halo front, and 1x140 Phante
    Keyboard
    Trust GTX THURA
    Mouse
    Trust GTX 148
    Internet Speed
    25+/5+ (+usually faster)
    Browser
    Chromium Edge Canary, Edge; Chrome; IE11
    Antivirus
    Windows Defender of course & Malwarebytes Anti-Exploit as an added layer between browser & OS
    Other Info
    Router: FRITZ!Box 7490
    Sound system: Philips Soundbar HTL2160 w/subwoofer
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