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Manually switching PWR_OK while testing a WC loop

post #1 of 3
Thread Starter 
Sometime next year, or possibly at Christmas, I intend to buy a new case and set up a watercooling system in preparation for South Islands. One thing I'm wary of is having to disconnect the ATX cable to check leaks, or running the whole machine and risk water damage to components :S

I thought about putting a physical switch on the PWR_OK rail, between the psu and motherboard. My idea is to leave the switch closed 99% of the time, and when I need to service the loop, I can open the switch. Then, I figure, the psu will turn on when I press the pc power button, but the motherboard, GPU and CPU will remain off while the motherboard waits for +5V on PWR_OK. Then I still have my pumps and fans active while filling/draining the loop or whatever.

This plan relies heavily on my feeble knowledge of the POST process, will the motherboard cry if it doesn't get the signal within a reasonable time, and is the rest of the motherboard/processors considered 'off' while it waits?
post #2 of 3
it would be easier to just disconnect the 24 pin ATX connector and jump the Enable(green wire) to the ground. Then you don't have to worry about the motherboard causing problems.
Sandy Thunder
(18 items)
 
QuickSilver X1
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CPUMotherboardGraphicsRAM
i7-3930k C1 4.6GHz @1.344v Sabertooth X79 2x EVGA GTX 560 Ti SC SLI 900/2106 Dominator 1866 16GB 9-10-9-27 
Hard DriveHard DriveCoolingOS
Crucial M4 64GB 'Cuda 320GB XSPC Rasa 750 RX240 push/pull + Alphacool UT60 ... Win 7 Pro x64 
MonitorMonitorMonitorKeyboard
Asus VE198D 19" Samsung 920NW 19" Samsung 906BW 19" Logitech G510s 
PowerCaseMouseMouse Pad
Corsair HX850M Carbide 400R Cyborg M.M.O. 7 Corsair MM200 
AudioOther
Bose Music Monitor Nuforce Icon HDP 
CPUMotherboardGraphicsRAM
Phenom II x6 1090T BE Sabertooth 990FX Radeon HD 5770 1GB Corsair Veangence Blue 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 1TB  Lite ON 16x DVD-R/RW ThermalRight Silver Arrow Windows 7 Professional 64 bit 
MonitorKeyboardPowerCase
Syncmaster 921BW 19" & Syncmaster 965 19" and S... Apple aluminum wired keyboard Corsair TX650 Silverstone TJ05 with window and thermal contro... 
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logitech mx air None Monsoon MM-700 
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Sandy Thunder
(18 items)
 
QuickSilver X1
(15 items)
 
 
CPUMotherboardGraphicsRAM
i7-3930k C1 4.6GHz @1.344v Sabertooth X79 2x EVGA GTX 560 Ti SC SLI 900/2106 Dominator 1866 16GB 9-10-9-27 
Hard DriveHard DriveCoolingOS
Crucial M4 64GB 'Cuda 320GB XSPC Rasa 750 RX240 push/pull + Alphacool UT60 ... Win 7 Pro x64 
MonitorMonitorMonitorKeyboard
Asus VE198D 19" Samsung 920NW 19" Samsung 906BW 19" Logitech G510s 
PowerCaseMouseMouse Pad
Corsair HX850M Carbide 400R Cyborg M.M.O. 7 Corsair MM200 
AudioOther
Bose Music Monitor Nuforce Icon HDP 
CPUMotherboardGraphicsRAM
Phenom II x6 1090T BE Sabertooth 990FX Radeon HD 5770 1GB Corsair Veangence Blue 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 1TB  Lite ON 16x DVD-R/RW ThermalRight Silver Arrow Windows 7 Professional 64 bit 
MonitorKeyboardPowerCase
Syncmaster 921BW 19" & Syncmaster 965 19" and S... Apple aluminum wired keyboard Corsair TX650 Silverstone TJ05 with window and thermal contro... 
MouseMouse PadAudio
logitech mx air None Monsoon MM-700 
  hide details  
Reply
post #3 of 3
Thread Starter 
Yeah that's probably what I'll end up doing, just saves some time shifting wires around to get the motherboard plug off if this idea works

The plug is rather tight to get off on my current psu/mobo combo, and the wires themselves are rather tightly routed, making the plug impossible to remove without pulling the wires through from the back of the case, which usually pulls off the sata data + power cables from my HDDs :S Eh, might just have to man up and deal with it
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