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  1. #1
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    Interesting find, 5900x not stable without curve optimizer, is my CPU faulty?

    Just found out something interesting, wondering if the CPU is faulty or if its a bios issue....

    I've been having a hard time getting my CPU/memory/bios/motherbord to be stable since I got 5900x

    relevant specs are
    AMD Ryzen | Nvidia GTX 3080 | Asus ROG Crosshair VIII Hero | 2x16GB DDR4 Samsung B-Die DDR 3600 CL16

    Basically I've been having issue where computer would be stable for awhile, then a random boot durning idle, and then no matter what settings in bios (not even ddr 2133/2400 with timings on auto) would the machine would not boot again to windows. Had to clear cmos or flash again to get machine back up. This was at any memory settings, all auto, DOCP only or any tweaking.

    Also had to change a lot of bios settings to get close to stability, never got it 100% stable, I was setting LLC to 3/4, idle current to typical, VSOC 1.15V at least, IOD VDDG around 1 to 1.05 and CCD around 0.98 to 1.05, still would crash at idle occasionally and then back to clear CMOS/reflash


    With bios 3202 I decided to try undervolting with curve optimizer, enabled all cores, negative value -20, no boot to windows, -10 no boot to windows, basically no matter what I tried, no boot to windows. Just for fun I tried per core cause I've read some cores undervolt more than others.

    To make a long story short I found out that 2 cores, cores (3&4 counting from zero) are unstable at any negative value, all other cores run fine at -20 (haven't tried higher). Infact I had to set those 2 cores to positive +5 to get the machine stable.

    And with these Curve Optimizer settings, all cores to -20 but 3&4 +5, machine is completly stable!? I don't need to set any volts for SOC, CCD, VDDG or LLC, all is on auto now.

    And I'm getting some great memory overclocks, currently at DDR3800 @ 14-14-14-28 and tweaked all subtimings. AIDA64 giving me 59.057MB read and 57ns Latency

    Disabling Curve optimizer and I'm back to previous troubles

    Thoughts? bios issue or is my CPU faulty?
    Last edited by ffletchs; 01-17-2021 at 07:17 PM.

  2. #2
    ROG Guru: Orange Belt Array xeizo PC Specs
    xeizo PC Specs
    Laptop (Model)HP i7-7500U 16GB 256GB NVMe
    MotherboardAsus Crosshair VII Hero
    ProcessorR9 5900X
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    Quote Originally Posted by ffletchs View Post
    Just found out something interesting, wondering if the CPU is faulty or if its a bios issue....

    I've been having a hard time getting my CPU/memory/bios/motherbord to be stable since I got 5900x

    relevant specs are
    AMD Ryzen | Nvidia GTX 3080 | Asus ROG Crosshair VIII Hero | 2x16GB DDR4 Samsung B-Die DDR 3600 CL16

    Basically I've been having issue where computer would be stable for awhile, then a random boot durning idle, and then no matter what settings in bios (not even ddr 2133/2400 with timings on auto) would the machine would not boot again to windows. Had to clear cmos or flash again to get machine back up. This was at any memory settings, all auto, DOCP only or any tweaking.

    Also had to change a lot of bios settings to get close to stability, never got it 100% stable, I was setting LLC to 3/4, idle current to typical, VSOC 1.15V at least, IOD VDDG around 1 to 1.05 and CCD around 0.98 to 1.05, still would crash at idle occasionally and then back to clear CMOS/reflash


    With bios 3202 I decided to try undervolting with curve optimizer, enabled all cores, negative value -20, no boot to windows, -10 no boot to windows, basically no matter what I tried, no boot to windows. Just for fun I tried per core cause I've read some cores undervolt more than others.

    To make a long story short I found out that 2 cores, cores (3&4 counting from zero) are unstable at any negative value, all other cores run fine at -20 (haven't tried higher). Infact I had to set those 2 cores to positive +5 to get the machine stable.

    And with these Curve Optimizer settings, all cores to -20 but 3&4 +5, machine is completly stable!? I don't need to set any volts for SOC, CCD, VDDG or LLC, all is on auto now.

    And I'm getting some great memory overclocks, currently at DDR3800 @ 14-14-14-28 and tweaked all subtimings. AIDA64 giving me 59.057MB read and 57ns Latency

    Disabling Curve optimizer and I'm back to previous troubles

    Thoughts? bios issue or is my CPU faulty?
    Glad you could fix it, but yes, basically if two cores needs more volt than default to even boot - your CPU is faulty. Bad QC from AMD. It may overclock bad, that would be ok, but not running default is not ok. With that said, running like you do is exactly what CO is made for to make possible.
    R9 5900X - X570 Crosshair VIII Hero/WiFi(bios 3101) - 32GB G.Skill Trident Z RGB@3800 - Noctua NH-D15 Chromax.black - EVGA RTX3070 FTW3 ULTRA - NZXT H700 w. Chromax.black fans - Corsair RM850x - 1TB 970 Evo Plus

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