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gpu power connector

post #1 of 6
Thread Starter 
So I just disassembled my graphics card to clean it (not doing that again. I think I might have made one of the capacitors a bit crooked, and there were about 50 screws that I had to undo.)

Anyway, I've never done that before so when I booted my computer and it made a huge squealing noise I was absolutely frightened. I then remembered that I didn't connect the power connection from the PSU to the graphics card. So I plugged that in, rebooted and everything was fine.


Is it reasonable to believe that the source of that huge squealing noise at start up was due to the absence of a power connection to my GPU?

On the plus side the card is running almost 10 degrees cooler.


Also, does it matter if you unplug the power cord to the PSU from the outlet, at the PSU, or can you unplug it at the outlet (when you are taking parts out of your computer)?
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post #2 of 6
Quote:
Originally Posted by fanaddict View Post
So I just disassembled my graphics card to clean it (not doing that again. I think I might have made one of the capacitors a bit crooked, and there were about 50 screws that I had to undo.)

Anyway, I've never done that before so when I booted my computer and it made a huge squealing noise I was absolutely frightened. I then remembered that I didn't connect the power connection from the PSU to the graphics card. So I plugged that in, rebooted and everything was fine.


Is it reasonable to believe that the source of that huge squealing noise at start up was due to the absence of a power connection to my GPU?

On the plus side the card is running almost 10 degrees cooler.


Also, does it matter if you unplug the power cord to the PSU from the outlet, at the PSU, or can you unplug it at the outlet (when you are taking parts out of your computer)?
I've heard of this before, and yeah: that was the cause. It's not harmed though.

Anyway, about the PSU question: I don't know if either way makes a difference, however I think that it might be best to turn the PSU off first, wait about 5 seconds, and then do what you need to do. I mean, if the power supply is off but still plugged in, then everything is grounded - provided that the outlet itself is grounded. So I mean, if you unplug the PSU as well, then the system is no longer grounded which means you can't ground yourself by touching an exposed metal part of the computer case.
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It's a computer!
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post #3 of 6
Yep, the loud beep/squeal noise is in fact when your GPU card is unplugged/underpowered. I learned this when I first tried Crossfire, I forgot to power the second card.. and SCREEEEEEEEEEEEEEEEEEE!!!!
I learned fast that lesson.


When I am working inside the PC when it is off, I leave it plugged in, but have the power switched off at the PSU. Simply put, this is for proper grounding.
post #4 of 6
Thread Starter 
So I should keep it plugged in to the power surge, and the power surge to the outlet, but just turn the PSU off and wait a few seconds before taking things out?


Edit, thanks for the information guys. I've heard many noises come from my computer, but none as loud as that.


Edit 2, and oh my god, I don't remember unseating graphics cards being as hard as it was this time. That PCI-E latch is crammed in the back between RAM, the graphics card and the heatsink. There is absolutely no room there.
Edited by fanaddict - 4/9/11 at 11:16pm
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post #5 of 6
I usually hit the switch on the back of the PSU, as well as pull the plug from it. That way I am sure the rig is getting NO power, and I am safe to start taking parts out.

Also note that I usually have to pull my rig out from under my desk as well.
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post #6 of 6
Quote:
Originally Posted by fanaddict View Post
So I should keep it plugged in to the power surge, and the power surge to the outlet, but just turn the PSU off and wait a few seconds before taking things out?


Edit, thanks for the information guys. I've heard many noises come from my computer, but none as loud as that.


Edit 2, and oh my god, I don't remember unseating graphics cards being as hard as it was this time. That PCI-E latch is crammed in the back between RAM, the graphics card and the heatsink. There is absolutely no room there.
If the PSU is not plugged into a grounded outlet, then your system is not grounded while you're working on it. However, it's critical to keep the PSU turned off while you're working on it for safety reasons.

Now, the reason why I recommend waiting a few seconds after turning the PSU off is because I've observed the following: when I turn my PSU off, it takes 3-5 seconds for the LEDs on my motherboard to turn off. I've never timed it; it just looks like 3-5 seconds.


Quote:
Originally Posted by Demented View Post
I usually hit the switch on the back of the PSU, as well as pull the plug from it. That way I am sure the rig is getting NO power, and I am safe to start taking parts out.

Also note that I usually have to pull my rig out from under my desk as well.
If the PSU is not plugged into a grounded outlet, then your system is not grounded while you're working on it. However, it's critical to have the PSU itself turned off while working on your system for safety reasons.
It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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