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Thread: Corsair RMi-850w , default 12V rail OCP setting ?

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    Default Corsair RMi-850w , default 12V rail OCP setting ?

    I have recenlty bought a Corsair RMi-850w , I have it set to Multi rail mode , and my gpu is connected to a single pcie-e cable to the PSU (for cable management purposes) , but i would like to know what are the OCP setting for the rails on this specific PSU , Its not in the manual or the unit review made by OW back in 2015
    CPU: i7 9700K / Motherboard: Gigabyte z390 Aorus Pro Wifi
    RAM: 2 x Ballistix 8GB DDR4 @3000MHz GPU: ASUS ROG STRIX RTX 2070 Advanced
    SSD: ADATA XPG SX8200 Pro 1TB NVMe / HDD: 3TB WD 30EZRX
    PSU: Corsair RM850i -850w Gold / CPU Cooler: bequiet! Dark Rock Pro 4
    PC Case: CoolerMaster H500P Mesh White /Monitor : Samsung Professional monitor S27B970D
    DAC: Audioengine D1 /Speakers : Focal XS 2.1 / Headphones: Sennheiser HD 380Pro / B&W PX

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    It has six or seven rails from 40A each afaik.

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    Thats what I thought , but if it was 40A it shouldnt have been tripped by vega64 and 2080Ti as reported by several users , am i right ? even the titan rtx adn vega 64 maxes out at around 305-340w according to Cybenetics lab which leaves alot of headroom even if the gpu is connected to a single cable

    https://www.reddit.com/r/nvidia/comm...al_psu_owners/


    https://forum.corsair.com/v3/showthread.php?t=154013 See Posts #9 and #10
    CPU: i7 9700K / Motherboard: Gigabyte z390 Aorus Pro Wifi
    RAM: 2 x Ballistix 8GB DDR4 @3000MHz GPU: ASUS ROG STRIX RTX 2070 Advanced
    SSD: ADATA XPG SX8200 Pro 1TB NVMe / HDD: 3TB WD 30EZRX
    PSU: Corsair RM850i -850w Gold / CPU Cooler: bequiet! Dark Rock Pro 4
    PC Case: CoolerMaster H500P Mesh White /Monitor : Samsung Professional monitor S27B970D
    DAC: Audioengine D1 /Speakers : Focal XS 2.1 / Headphones: Sennheiser HD 380Pro / B&W PX

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    Quote Originally Posted by Mezoxin View Post
    Thats what I thought , but if it was 40A it shouldnt have been tripped by vega64 and 2080Ti as reported by several users , am i right ? even the titan rtx adn vega 64 maxes out at around 305-340w according to Cybenetics lab which leaves alot of headroom even if the gpu is connected to a single cable

    https://www.reddit.com/r/nvidia/comm...al_psu_owners/


    https://forum.corsair.com/v3/showthread.php?t=154013 See Posts #9 and #10
    Are you even having shut down issues now?

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    no ofcourse not , not on my current system , nor do i expect it to , my gpu maxes out at 200w , but i like to know what are my OCP limit are set at you may call it PC enthusiasm, thats what made me go for the i version in the first place
    CPU: i7 9700K / Motherboard: Gigabyte z390 Aorus Pro Wifi
    RAM: 2 x Ballistix 8GB DDR4 @3000MHz GPU: ASUS ROG STRIX RTX 2070 Advanced
    SSD: ADATA XPG SX8200 Pro 1TB NVMe / HDD: 3TB WD 30EZRX
    PSU: Corsair RM850i -850w Gold / CPU Cooler: bequiet! Dark Rock Pro 4
    PC Case: CoolerMaster H500P Mesh White /Monitor : Samsung Professional monitor S27B970D
    DAC: Audioengine D1 /Speakers : Focal XS 2.1 / Headphones: Sennheiser HD 380Pro / B&W PX

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    Quote Originally Posted by Mezoxin View Post
    Thats what I thought , but if it was 40A it shouldnt have been tripped by vega64 and 2080Ti as reported by several users , am i right ? even the titan rtx adn vega 64 maxes out at around 305-340w according to Cybenetics lab which leaves alot of headroom even if the gpu is connected to a single cable

    https://www.reddit.com/r/nvidia/comm...al_psu_owners/


    https://forum.corsair.com/v3/showthread.php?t=154013 See Posts #9 and #10
    With overclocks and because of high current peaks a 40A OCP can be tripped. But this is a good thing because pushes them to use two cables. Or they make the bad choice of disabling the OCP.

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    Quote Originally Posted by -The_Mask- View Post
    With overclocks and because of high current peaks a 40A OCP can be tripped. But this is a good thing because pushes them to use two cables. Or they make the bad choice of disabling the OCP.
    Thanks for your answer

    yeah its annoying how most people on that reddit thread decided to enable single rail , rather than ditributing the load on multiple rails , which is a normal behavior because if the user doesnt understand the benefits of safety systems he is going to bypass or disable them
    I would also like to know on what basis is the OCP parameter determined , is it determined based on psu cables wire gauge and its resistance , or the resistance of inner circuitry components of devices that may be connected to the 12V rail ( which of those two is more vulnerable ?)

    In other words , what is the main hazardous event that it trying to prevent or mitigate by setting the OCP at 40A
    CPU: i7 9700K / Motherboard: Gigabyte z390 Aorus Pro Wifi
    RAM: 2 x Ballistix 8GB DDR4 @3000MHz GPU: ASUS ROG STRIX RTX 2070 Advanced
    SSD: ADATA XPG SX8200 Pro 1TB NVMe / HDD: 3TB WD 30EZRX
    PSU: Corsair RM850i -850w Gold / CPU Cooler: bequiet! Dark Rock Pro 4
    PC Case: CoolerMaster H500P Mesh White /Monitor : Samsung Professional monitor S27B970D
    DAC: Audioengine D1 /Speakers : Focal XS 2.1 / Headphones: Sennheiser HD 380Pro / B&W PX

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    Isn't 40A at 12V 480W? What GPU consumes that?
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    Quote Originally Posted by ehume View Post
    Isn't 40A at 12V 480W? What GPU consumes that?
    I was thinking the same thing , the highest peak load out of all gpu's according to cybenetics measurings was on vega 64 during gaming and the value was 339.72 W
    CPU: i7 9700K / Motherboard: Gigabyte z390 Aorus Pro Wifi
    RAM: 2 x Ballistix 8GB DDR4 @3000MHz GPU: ASUS ROG STRIX RTX 2070 Advanced
    SSD: ADATA XPG SX8200 Pro 1TB NVMe / HDD: 3TB WD 30EZRX
    PSU: Corsair RM850i -850w Gold / CPU Cooler: bequiet! Dark Rock Pro 4
    PC Case: CoolerMaster H500P Mesh White /Monitor : Samsung Professional monitor S27B970D
    DAC: Audioengine D1 /Speakers : Focal XS 2.1 / Headphones: Sennheiser HD 380Pro / B&W PX

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    Transient spikes can get higher than that, but you need a faster meter to see those spikes.

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