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  1. #1
    ROG Member Array samuel9521 PC Specs
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    MotherboardAsus ROG Strix Z370-F Gaming
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    Question Overclock i5-8600k with some benchmarks

    Hi All,
    I have an intel core i5-8600k overclocked to 5GHz at 1.33V, but I tested it at 1.39V @5.1GHz, and it seems to be stable.
    Do you think it's safe to set this voltage for everyday usage?
    Thanks in advance
    Last edited by samuel9521; 01-15-2018 at 09:26 PM.

  2. #2
    Administrator Array Silent Scone@ASUS's Avatar
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    Quote Originally Posted by samuel9521 View Post
    Hi All,
    I have an intel core i5-8600k overclocked to 5GHz at 1.33V, but I tested it at 1.39V @5.1GHz, and it seems to be stable.
    Do you think it's safe to set this voltage for everyday usage?
    Thanks in advance


    Yes, up to 1.4v is fine on that CPU. Just be sure to try and keep temps under 80C. For the jump in voltage required, it's arguably not worth it.

  3. #3
    ROG Member Array samuel9521 PC Specs
    samuel9521 PC Specs
    MotherboardAsus ROG Strix Z370-F Gaming
    ProcessorIntel Core i5-8600K @5GHz-Cache @4,5GHz
    Memory (part number)G.Skill Trident Z RGB 2x8GB @3866MHz 16-18-18-38
    Graphics Card #1EVGA GeForce RTX 2070 XC ULTRA
    MonitorAOC Agon AG241QX 1440p 144Hz 1ms
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    Ok I tried lowering the voltage below 1.39V @5.1GHz, but it's unstable.
    With that voltage, I managed to set the max cache ratio at 45, and the system passed aida64 stress test and various benchmarks, like Geekbench 4, Cinebench R15 and CPU-Z with a maximum temperature of 72°. I also set the CPU current capability to 120%, while drams are running @3866MHz at 1.4V with VCCIO at 1.1875V, VCCSA at 1.2125V and 15-15-15-36 timings.

    Here are some results if you want to compare:

    Cinebench R15: 223cb single-core, 1285cb multi-core

    Geekbench 4: 6608 single-core, 26082 multi-core

    CPU-Z: 617.2 single-core, 3618.3 multi-core

    Aida64: 62585 CPU Queen, 8330MB/s CPU Hash, 31555MPx/s CPU PhotoWorxx, 975.9GFloPS Single-Precision, 486.8GFloPS Double-Precision

  4. #4
    ROG Member Array Bronson PC Specs
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    MotherboardAsus ROG Z370 f
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    Hi Samuel9521, can you tell me the settings in the bios you use?
    i am having trouble getting my i5 8600k over 5ghz, runnign at the mom 4.9ghz at 1.4 volt. anything lower boots but my games keep crashing.
    Last edited by Bronson; 03-15-2018 at 02:46 AM.

  5. #5
    ROG Member Array samuel9521 PC Specs
    samuel9521 PC Specs
    MotherboardAsus ROG Strix Z370-F Gaming
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    Memory (part number)G.Skill Trident Z RGB 2x8GB @3866MHz 16-18-18-38
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    Actually I had some random crashes at 5.1GHz, so I went down to 5.

    Note that my settings may not work with your system, exceptionally for DRAM settings.

    My current settings are:

    AI Overclock Tuner Manual
    BCLK Frequency 100.0000
    ASUS MultiCore Enhancement Disabled
    SVID Behavior Auto
    AVX 0
    CPU Core Ratio Sync All Cores
    -1 to 6-Core Ratio Limit 50
    BCLK Frequency : DRAM Frequency Ratio Auto
    DRAM Odd Ratio Mode Enabled
    DRAM Frequency DDR4-3866MHz
    TPU Keep Current Settings
    Power-saving & Performance Mode Performance mode
    CPU SVID Support Disabled
    CPU Core/Cache Current Limit Max 255.50
    CPU Graphics Current Limit 255.50
    Ring Down Bin Auto
    Min CPU Cache Ratio Auto
    Max CPU Cache Ratio 45
    Max CPU Graphics Ratio 25
    BCLK Aware Adaptive Voltage Auto
    CPU Core/Cache Voltage Manual Mode
    -CPU Core Voltage Override 1.345
    DRAM Voltage 1.4058
    CPU VCCIO Voltage 1.0875
    CPU System Agent Voltage 1.1375
    CPU Graphics Voltage Offset Mode
    -CPU Graphics Voltage Offset 0.150
    PCH Core Voltage 1.00000
    CPU Standby Voltage Auto
    DRAM TIMING CONTROL
    DRAM CAS# Latency 15
    DRAM RAS# to CAS# Delay 15
    DRAM RAS# ACT Time 36
    INTERNAL CPU POWER MANAGEMENT
    Intel SpeedStep Disabled
    Turbo Mode Enabled
    Long Duration Package Power Limit 4095
    Package Power Time Window 127
    Short Duration Package Power Limit
    4095
    TWEAKER'S PARADISE
    FCLK Frequency 1GHz
    ADVANCED\CPU CONFIGURATION\CPU - POWER MANAGEMENT CONTROL
    Intel SpeedStep Disabled
    Turbo Mode Enabled
    CPU C-states Disabled
    CFG Lock Disabled
    Intel Speed Shift Technology Disabled
    Last edited by samuel9521; 03-15-2018 at 08:50 PM.

  6. #6
    ROG Member Array Bronson PC Specs
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    Ok, thanks for the info, i tried them but still no luck on getting 5ghz stable.
    I currently use your settings with 4.9ghz @ 1,36volt with max temps at 70C.
    i also tried different digi+ vrm settings
    cpu llc - lv5
    cpu current capacity - 140%
    vrm switching frequenzy - manual , at 500

    I hope to break that 5ghz barrier on my i5 8600k. if you have any ideas, i plan on deliding it but not now.
    Last edited by Bronson; 03-16-2018 at 02:57 PM.

  7. #7
    ROG Enthusiast Array av3nger PC Specs
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    Stable clocks at 5ghz can get tricky with i5. The motherboard can play a huge factor. What motherboard are you running?

  8. #8
    ROG Member Array Bronson PC Specs
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    Hello av3nger,

    i am using the Asus ROG Z370 F.
    My CPU cooler is the Be Quiet! Dark Rock Pro 3.
    you can see al my specs under my name.
    at the moment i am just happy if can get my earlier 4.9ghz stabel again
    i have been playing around so much that its not stabel anymore.

  9. #9
    ROG Member Array Bronson PC Specs
    Bronson PC Specs
    MotherboardAsus ROG Z370 f
    Processori5 8600k
    Memory (part number)16gb Crucial Ballistix Elite @3466mhz
    Graphics Card #1GTX1080
    MonitorAsus pg279q
    Storage #1Intel 730 256gb
    Storage #2OCZ Arc100 256gb
    CPU CoolerBe Quiet! Dark Rock Pro 3
    CaseCoolermaster MasterCase Pro 5
    Power SupplyBe Quiet! Dark Power Pro 10 550W
    Keyboard Cherry MX Board 6.0
    Mouse Zowie EC1-A
    Headset Sennheiser cx3.00
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    Hi,
    long time no see
    with the new bios 1406, i got it stabel at 4.9 ghz with your settings (except the ram). i should get higher settings on my ram since the sticks are rated higher then my current 3200mhz, hmm maybe i should try loosening the timings a little.
    also i was just looking into BCLK overclocking, it seems to give a little more performance.

  10. #10
    ROG Member Array samuel9521 PC Specs
    samuel9521 PC Specs
    MotherboardAsus ROG Strix Z370-F Gaming
    ProcessorIntel Core i5-8600K @5GHz-Cache @4,5GHz
    Memory (part number)G.Skill Trident Z RGB 2x8GB @3866MHz 16-18-18-38
    Graphics Card #1EVGA GeForce RTX 2070 XC ULTRA
    MonitorAOC Agon AG241QX 1440p 144Hz 1ms
    Storage #1Samsung SSD 960 PRO 512GB
    Storage #2WD Green 1TB
    CPU CoolerCooler Master MasterLiquid Pro 240
    CaseCorsair Crystal 460X
    Power SupplyEvga Supernova 650 G3
    Keyboard Cooler Master MasterKeys Lite L Combo
    Mouse Cooler Master MasterKeys Lite L Combo Mouse
    Headset Logitech G633
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    Hi Bronson, nice to see that you didn't give up

    Here I attached screenshots of my stable bios settings for 5GHz. I think you should try to overclock your system in an ordered way as I did (the bios offers you a way to save your settings in the Tool menu):
    1) set all the values from Auto to their default ones (for example 43 in CPU Core Ratio and 2133 for RAM frequency), and set all the power settings as in my screenshots;
    2) overclock your RAM by changing frequency, timings and voltage;
    3) overclock your CPU just by changing ratio and voltage (you will have set all the power and llc settings in digi+ vrm page at step 1);
    4) overclock FCLK and Cache.

    With your RAM, you should use their factory overclocked speed (mine is 3866), set both VCCIO and VCC System Agent to 1,25, and then you could try lowering the timings together with the voltages (if your sticks are good, you should be able to reach 1,5 V but i don't think it's worth, and in some cases VCCIO and VCCSA can get quite low - i set them to 1,075 and 1,125).
    Before changing the timings, try using 1N as the DRAM Command Rate, and if it fails booting up or if it's unstable, just set it to 2N.

    In order to test RAM stability, I recommend you this software: http://virgilioborges.com.br/hyperpi/
    Run the test on all cores with 32M digits, it will take 7 to 11 mins to complete. If an error occurs, it means that your overclock is unstable.

    During your tests, run a 10 mins stress test in Aida64 and see if it's all good (temperatures too, with my settings I get an average of 69°C with a CM MasterLiquid Pro 240).
    Try also doing multiple benchmarks with softwares like Cinebench, Geekbench, CPU-Z, etc.

    I don't know pretty much anything about BCLK overclock, I tried it some times but I failed, and I don't actually think it's worth doing it with a mainstream CPU, maybe it could be nice on a server machine.
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    Last edited by samuel9521; 09-24-2018 at 05:26 PM.

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