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How strong a fan I need for Corsair CX 400W cooling?

191x7
By 191x7
in Power Supplies
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I need a new fan for my CX400 PSU. I need it to be able to start around 4V but I don't know how much CFM or m^3/s or even RPM I need. Don't want it too loud, but would want it cool. The original ADDA did its all, the baring is done.

M.S.C.E. (M.Sc. Computer Engineering), IT specialist in a hospital, 30+ years of gaming, 20+ years of computer enthusiasm, Geek, Trekkie, anime fan

  • Main PC: AMD Ryzen 7 5800X3D - EK AIO 360 D-RGB - Arctic Cooling MX-4 - Asus Prime X570-P - 4x8GB DDR4 3200 HyperX Fury CL16 - Sapphire AMD Radeon 6950XT Nitro+ - 1TB Kingston Fury Renegade - 2TB Kingston Fury Renegade - 512GB ADATA SU800 - 960GB Kingston A400 - Seasonic PX-850 850W  - custom black ATX and EPS cables - Fractal Design Define R5 Blackout - Windows 11 x64 23H2 - 3 Arctic Cooling P14 PWM PST - 5 Arctic Cooling P12 PWM PST
  • Peripherals: LG 32GK650F - Dell P2319h - Logitech G Pro X Superlight with Tiger Ice - HyperX Alloy Origins Core (TKL) - EndGame Gear MPC890 - Genius HF 1250B - Akliam PD4 - Sennheiser HD 560s - Simgot EM6L - Truthear Zero - QKZ x HBB - 7Hz Salnotes Zero - Logitech C270 - Behringer PS400 - BM700  - Colormunki Smile - Speedlink Torid - Jysk Stenderup - LG 24x External DVD writer - Konig smart card reader
  • Laptop: Acer E5–575G-386R 15.6" 1080p (i3 6100U + 12GB DDR4 (4GB+8GB) + GeForce 940MX + 256GB nVME) Win 10 Pro x64 22H2 - Logitech G305 + AAA Lithium battery
  • Networking: Asus TUF Gaming AX6000 - Arcadyan ISP router - 35/5 Mbps vDSL
  • TV and gadgets: TCL 50EP680 50" 4K LED + Sharp HT-SB100 75W RMS soundbar - Samsung Galaxy Tab A8 10.1" - OnePlus 9 256GB - Olymous Cameda C-160 - GameBoy Color 
  • Streaming/Server/Storage PC: AMD Ryzen 5 3600 - LC-Power LC-CC-120 - MSI B450 Tomahawk Max - 2x4GB ADATA 2666 DDR4 - 120GB Kingston V300 - Toshiba DT01ACA100 1TB - Toshiba DT01ACA200 2TB - 2x WD Green 2TB - Sapphire Pulse AMD Radeon R9 380X - 550W EVGA G3 SuperNova - Chieftec Giga DF-01B - White Shark Spartan X keyboard - Roccat Kone Pure Military Desert strike - Logitech S-220 - Philips 226L
  • Livingroom PC (dad uses): AMD FX 8300 - Arctic Freezer 64 - Asus M5A97 R2.0 Evo - 2x4GB DDR3 1833 Kingston - MSI Radeon HD 7770 1GB OC - 120GB Adata SSD - 500W Fractal Design Essence - DVD-RW - Samsung SM 2253BW - Logitech G710+ - wireless vertical mouse - MS 2.0 speakers
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any fan will do

-The Bellerophon- Obsidian 550D-i5-3570k@4.5Ghz -Asus Sabertooth Z77-16GB Corsair Dominator Platinum 1866Mhz-x2 EVGA GTX 760 Dual FTW 4GB-Creative Sound Blaster XF-i Titanium-OCZ Vertex Plus 120GB-Seagate Barracuda 2TB- https://linustechtips.com/main/topic/60154-the-not-really-a-build-log-build-log/ Twofold http://linustechtips.com/main/topic/121043-twofold-a-dual-itx-system/ How great is EVGA? http://linustechtips.com/main/topic/110662-evga-how-great-are-they/#entry1478299

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Any? You sure? I don't think so. If I put a fan that starts at 7V (like a Xilence Red Wing with hydro baring) it will not cool the PSU until it gets really hot (because the CX ramps the fan from arround 3.5V to 12V depending on the PSU load).

M.S.C.E. (M.Sc. Computer Engineering), IT specialist in a hospital, 30+ years of gaming, 20+ years of computer enthusiasm, Geek, Trekkie, anime fan

  • Main PC: AMD Ryzen 7 5800X3D - EK AIO 360 D-RGB - Arctic Cooling MX-4 - Asus Prime X570-P - 4x8GB DDR4 3200 HyperX Fury CL16 - Sapphire AMD Radeon 6950XT Nitro+ - 1TB Kingston Fury Renegade - 2TB Kingston Fury Renegade - 512GB ADATA SU800 - 960GB Kingston A400 - Seasonic PX-850 850W  - custom black ATX and EPS cables - Fractal Design Define R5 Blackout - Windows 11 x64 23H2 - 3 Arctic Cooling P14 PWM PST - 5 Arctic Cooling P12 PWM PST
  • Peripherals: LG 32GK650F - Dell P2319h - Logitech G Pro X Superlight with Tiger Ice - HyperX Alloy Origins Core (TKL) - EndGame Gear MPC890 - Genius HF 1250B - Akliam PD4 - Sennheiser HD 560s - Simgot EM6L - Truthear Zero - QKZ x HBB - 7Hz Salnotes Zero - Logitech C270 - Behringer PS400 - BM700  - Colormunki Smile - Speedlink Torid - Jysk Stenderup - LG 24x External DVD writer - Konig smart card reader
  • Laptop: Acer E5–575G-386R 15.6" 1080p (i3 6100U + 12GB DDR4 (4GB+8GB) + GeForce 940MX + 256GB nVME) Win 10 Pro x64 22H2 - Logitech G305 + AAA Lithium battery
  • Networking: Asus TUF Gaming AX6000 - Arcadyan ISP router - 35/5 Mbps vDSL
  • TV and gadgets: TCL 50EP680 50" 4K LED + Sharp HT-SB100 75W RMS soundbar - Samsung Galaxy Tab A8 10.1" - OnePlus 9 256GB - Olymous Cameda C-160 - GameBoy Color 
  • Streaming/Server/Storage PC: AMD Ryzen 5 3600 - LC-Power LC-CC-120 - MSI B450 Tomahawk Max - 2x4GB ADATA 2666 DDR4 - 120GB Kingston V300 - Toshiba DT01ACA100 1TB - Toshiba DT01ACA200 2TB - 2x WD Green 2TB - Sapphire Pulse AMD Radeon R9 380X - 550W EVGA G3 SuperNova - Chieftec Giga DF-01B - White Shark Spartan X keyboard - Roccat Kone Pure Military Desert strike - Logitech S-220 - Philips 226L
  • Livingroom PC (dad uses): AMD FX 8300 - Arctic Freezer 64 - Asus M5A97 R2.0 Evo - 2x4GB DDR3 1833 Kingston - MSI Radeon HD 7770 1GB OC - 120GB Adata SSD - 500W Fractal Design Essence - DVD-RW - Samsung SM 2253BW - Logitech G710+ - wireless vertical mouse - MS 2.0 speakers
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Any? You sure? I don't think so. If I put a fan that starts at 7V (like a Xilence Red Wing with hydro baring) it will not cool the PSU until it gets really hot (because the CX ramps the fan from arround 3.5V to 12V depending on the PSU load).

Try looking into the Scythe Grand flex it has a low starting voltage of around 4V, just a side note you will need to convert the 3 pin into the 2 pin headers inside the PSU, and of course be cautious when opening a PSU letting it sit for a good 30-60mins to discharge and not to touch the leads on the capacitors.

Here's another PSU fan mod that is very similar:

http://linustechtips.com/main/topic/227775-psu-fan-replacement/

Updated Modding FAQ

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  • 3 weeks later...
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Would a 44 CFM fan do?

 

I can't get a good fan that starts at lower than 6-7V without paying allmost a half of a new and decent power supply (like for example a CX430) so I will just buy a Xilence RedWing 120MM 1300+-10% Fluid Hydro Baring fan and attach it to a molex IF it is enough to cool the PSU unit.

M.S.C.E. (M.Sc. Computer Engineering), IT specialist in a hospital, 30+ years of gaming, 20+ years of computer enthusiasm, Geek, Trekkie, anime fan

  • Main PC: AMD Ryzen 7 5800X3D - EK AIO 360 D-RGB - Arctic Cooling MX-4 - Asus Prime X570-P - 4x8GB DDR4 3200 HyperX Fury CL16 - Sapphire AMD Radeon 6950XT Nitro+ - 1TB Kingston Fury Renegade - 2TB Kingston Fury Renegade - 512GB ADATA SU800 - 960GB Kingston A400 - Seasonic PX-850 850W  - custom black ATX and EPS cables - Fractal Design Define R5 Blackout - Windows 11 x64 23H2 - 3 Arctic Cooling P14 PWM PST - 5 Arctic Cooling P12 PWM PST
  • Peripherals: LG 32GK650F - Dell P2319h - Logitech G Pro X Superlight with Tiger Ice - HyperX Alloy Origins Core (TKL) - EndGame Gear MPC890 - Genius HF 1250B - Akliam PD4 - Sennheiser HD 560s - Simgot EM6L - Truthear Zero - QKZ x HBB - 7Hz Salnotes Zero - Logitech C270 - Behringer PS400 - BM700  - Colormunki Smile - Speedlink Torid - Jysk Stenderup - LG 24x External DVD writer - Konig smart card reader
  • Laptop: Acer E5–575G-386R 15.6" 1080p (i3 6100U + 12GB DDR4 (4GB+8GB) + GeForce 940MX + 256GB nVME) Win 10 Pro x64 22H2 - Logitech G305 + AAA Lithium battery
  • Networking: Asus TUF Gaming AX6000 - Arcadyan ISP router - 35/5 Mbps vDSL
  • TV and gadgets: TCL 50EP680 50" 4K LED + Sharp HT-SB100 75W RMS soundbar - Samsung Galaxy Tab A8 10.1" - OnePlus 9 256GB - Olymous Cameda C-160 - GameBoy Color 
  • Streaming/Server/Storage PC: AMD Ryzen 5 3600 - LC-Power LC-CC-120 - MSI B450 Tomahawk Max - 2x4GB ADATA 2666 DDR4 - 120GB Kingston V300 - Toshiba DT01ACA100 1TB - Toshiba DT01ACA200 2TB - 2x WD Green 2TB - Sapphire Pulse AMD Radeon R9 380X - 550W EVGA G3 SuperNova - Chieftec Giga DF-01B - White Shark Spartan X keyboard - Roccat Kone Pure Military Desert strike - Logitech S-220 - Philips 226L
  • Livingroom PC (dad uses): AMD FX 8300 - Arctic Freezer 64 - Asus M5A97 R2.0 Evo - 2x4GB DDR3 1833 Kingston - MSI Radeon HD 7770 1GB OC - 120GB Adata SSD - 500W Fractal Design Essence - DVD-RW - Samsung SM 2253BW - Logitech G710+ - wireless vertical mouse - MS 2.0 speakers
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Would a 44 CFM fan do?

 

I can't get a good fan that starts at lower than 6-7V without paying allmost a half of a new and decent power supply (like for example a CX430) so I will just buy a Xilence RedWing 120MM 1300+-10% Fluid Hydro Baring fan and attach it to a molex IF it is enough to cool the PSU unit.

It should perform well as long as it is a decently pressure optimized fan, and yes you can alway use the motherboard's fan control or directly wire it to moles to control the speed to the fan which will eliminate any worry of it not starting at a lower voltage or heating up.

Updated Modding FAQ

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