Overclock.net › Forums › Cooling › Air Cooling › Fan speed reducer 7v molex plug
New Posts  All Forums:Forum Nav:

Fan speed reducer 7v molex plug

post #1 of 15
Thread Starter 
http://www.ebay.com/itm/7-volt-4-Pin-Fan-Adapter-Cable-Speed-Reducer-NEW-/370972187579?pt=US_Computer_Case_Fans&hash=item565faa5bbb

I currently have four 120mm fans daisy chained connected to a single molex directly off my PSU. They all run at 12v and its cool....but I wanna cheap and quick solution to drop them to 7v without buying a fan controller. Will something like the above link be okay to use in my situation? Will it cause any harm to any other components if using for a long time? Thanks in advanced!
My System
(16 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 4670k 4.6GHz 1.24v Asus Maximus VI Hero EVGA GTX 780 ACX x2 SLI 16gb G.Skill Trident X 2400mhz CL10 
Hard DriveCoolingOSMonitor
Samsung 840 PRO 256gb Noctua NH-D15 Windows 8.1 PRO 64 Bit Dell UltraSharp U3011 30inch 2560x1600 
PowerCaseMouseMouse Pad
Seasonic X-850 80+ Gold Cooler Master HAF X Logitech G602 Corsair Vengeance MM200 
AudioAudio
Schiit Modi USB DAC External Sound Card Corsair SP2500 2.1 Speakers 
  hide details  
Reply
My System
(16 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 4670k 4.6GHz 1.24v Asus Maximus VI Hero EVGA GTX 780 ACX x2 SLI 16gb G.Skill Trident X 2400mhz CL10 
Hard DriveCoolingOSMonitor
Samsung 840 PRO 256gb Noctua NH-D15 Windows 8.1 PRO 64 Bit Dell UltraSharp U3011 30inch 2560x1600 
PowerCaseMouseMouse Pad
Seasonic X-850 80+ Gold Cooler Master HAF X Logitech G602 Corsair Vengeance MM200 
AudioAudio
Schiit Modi USB DAC External Sound Card Corsair SP2500 2.1 Speakers 
  hide details  
Reply
post #2 of 15
That is known as "The 7 volt trick" You put the 12v and 5v to the motor and it operates at the difference of the two voltages. It should be fine, but apparently some cheap PSUs have issues with it. The remaining 5v gets sent back to the PSU and this can cause issues. Your seasonic is not a low end PSU, but you still might want to google the 7v trick to learn more.
post #3 of 15
I recently found out that this trick wasn't meant for a "heavy duty" task.

so here's the 7v mod without any load showing 6.70 which seems to be OK:


and here's when I connect a 0.09A fan to it:



the voltage drop to 6.29v, which hilariously too much considering the fan only require a small amount of juice redface.gif

so if you planned to go daisy chain 4 of your fans via the 7v mod, your fans might get stuck since the voltage drops far too low for them to start spinning
post #4 of 15
Thread Starter 
Thank you for the picture inVain.
My System
(16 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 4670k 4.6GHz 1.24v Asus Maximus VI Hero EVGA GTX 780 ACX x2 SLI 16gb G.Skill Trident X 2400mhz CL10 
Hard DriveCoolingOSMonitor
Samsung 840 PRO 256gb Noctua NH-D15 Windows 8.1 PRO 64 Bit Dell UltraSharp U3011 30inch 2560x1600 
PowerCaseMouseMouse Pad
Seasonic X-850 80+ Gold Cooler Master HAF X Logitech G602 Corsair Vengeance MM200 
AudioAudio
Schiit Modi USB DAC External Sound Card Corsair SP2500 2.1 Speakers 
  hide details  
Reply
My System
(16 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 4670k 4.6GHz 1.24v Asus Maximus VI Hero EVGA GTX 780 ACX x2 SLI 16gb G.Skill Trident X 2400mhz CL10 
Hard DriveCoolingOSMonitor
Samsung 840 PRO 256gb Noctua NH-D15 Windows 8.1 PRO 64 Bit Dell UltraSharp U3011 30inch 2560x1600 
PowerCaseMouseMouse Pad
Seasonic X-850 80+ Gold Cooler Master HAF X Logitech G602 Corsair Vengeance MM200 
AudioAudio
Schiit Modi USB DAC External Sound Card Corsair SP2500 2.1 Speakers 
  hide details  
Reply
post #5 of 15
I would use the something like this instead. Much safer and no "tricks" involved. The 7v "trick" isn't really a good way to go. I've done it and had no problems but that was when I was young and fearless... . smile.gif
http://www.ebay.com/itm/Universal-3-pin-CPU-Speed-Reducer-PVC-Cable-Cord-for-Electric-Fan-CPU-Fan-/151101555297?pt=LH_DefaultDomain_0&hash=item232e5ac261
post #6 of 15
I previously answered your thread but your best bet is doyll's suggestion. The safest way is to buy a set of them
http://www.ebay.com/itm/5x-Universal-3-pin-CPU-Speed-Reducer-PVC-Cable-Cord-for-Electric-Fan-CPU-Fan-/301018276394
Ayase Eli
(20 items)
 
Testbench
(10 items)
 
MC Server
(13 items)
 
CPUMotherboardGraphicsRAM
AMD Ryzen 7 1700 ASRock X370 SLI Killer Zotac GTX1070 "FE" with ID Cooling Frostflow 240G Crucial BallistiX Sport LP 16GB 8x2GB 
Hard DriveHard DriveHard DriveCooling
Zotac SSD Premium 480GB OCZ Vector 180 480GB Hitachi 7K3000 3TB 7200rpm ID Cooling Frostflow 240L 
CoolingCoolingCoolingCooling
ID Cooling Frostflow 240G Phanteks F140MP x2 CoolerMaster Silencio FP120 x2 Phanteks F140SP 
CoolingMonitorKeyboardPower
Delta AFB1212SH x2 Dell U2713HM CM Storm MECH FSP Aurum PT 1200 
CaseMouseMouse PadAudio
Phanteks Enthoo Pro Logitech G102 Tesoro Aegis X3 Virtus.Pro AKG K7XX 
CPUMotherboardGraphicsRAM
Intel i7 6700k Gigabyte Z170X-UD5 Depends Depends 
Hard DriveCoolingMonitorKeyboard
Plextor M5S Depends Dell U2312HM CM Storm Quickfire Rapid-i 
PowerMouse
FSP Aurum PT 1200 CM Storm Mizar 
CPUMotherboardGraphicsRAM
Intel i7 2600 4GHz Gigabyte Z77X D3H Intel HD Graphics 2000 obviously Kingston HyperX Genesis 4X4GB DDR3 1600 
Hard DriveCoolingCoolingCooling
Intel 530 240GB Deepcool Captain 240 Arctic Cooling Bionix 140 Delta AFB1212L 
OSPowerCase
Windows 10 Pro CoolerMaster G750M NZXT Switch 810 
  hide details  
Reply
Ayase Eli
(20 items)
 
Testbench
(10 items)
 
MC Server
(13 items)
 
CPUMotherboardGraphicsRAM
AMD Ryzen 7 1700 ASRock X370 SLI Killer Zotac GTX1070 "FE" with ID Cooling Frostflow 240G Crucial BallistiX Sport LP 16GB 8x2GB 
Hard DriveHard DriveHard DriveCooling
Zotac SSD Premium 480GB OCZ Vector 180 480GB Hitachi 7K3000 3TB 7200rpm ID Cooling Frostflow 240L 
CoolingCoolingCoolingCooling
ID Cooling Frostflow 240G Phanteks F140MP x2 CoolerMaster Silencio FP120 x2 Phanteks F140SP 
CoolingMonitorKeyboardPower
Delta AFB1212SH x2 Dell U2713HM CM Storm MECH FSP Aurum PT 1200 
CaseMouseMouse PadAudio
Phanteks Enthoo Pro Logitech G102 Tesoro Aegis X3 Virtus.Pro AKG K7XX 
CPUMotherboardGraphicsRAM
Intel i7 6700k Gigabyte Z170X-UD5 Depends Depends 
Hard DriveCoolingMonitorKeyboard
Plextor M5S Depends Dell U2312HM CM Storm Quickfire Rapid-i 
PowerMouse
FSP Aurum PT 1200 CM Storm Mizar 
CPUMotherboardGraphicsRAM
Intel i7 2600 4GHz Gigabyte Z77X D3H Intel HD Graphics 2000 obviously Kingston HyperX Genesis 4X4GB DDR3 1600 
Hard DriveCoolingCoolingCooling
Intel 530 240GB Deepcool Captain 240 Arctic Cooling Bionix 140 Delta AFB1212L 
OSPowerCase
Windows 10 Pro CoolerMaster G750M NZXT Switch 810 
  hide details  
Reply
post #7 of 15
post #8 of 15
Here's a tutorial on repinning the plug yourself so you dont have to spend any money:

http://www.hardwaresecrets.com/article/496
post #9 of 15
honestly that guide is abit meh

i wouldnt run a PWM fan with voltage control. good way to shorten the fan's life and cause unnecessary noise
post #10 of 15
Quote:
Originally Posted by inVain View Post

I recently found out that this trick wasn't meant for a "heavy duty" task.

so here's the 7v mod without any load showing 6.70 which seems to be OK:


and here's when I connect a 0.09A fan to it:



the voltage drop to 6.29v, which hilariously too much considering the fan only require a small amount of juice redface.gif

so if you planned to go daisy chain 4 of your fans via the 7v mod, your fans might get stuck since the voltage drops far too low for them to start spinning

start up voltage for fans are around the 5v anyway, 6.something volts is still enough to start most computer fans
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Air Cooling
Overclock.net › Forums › Cooling › Air Cooling › Fan speed reducer 7v molex plug