I went to check the voltages on the power supply (Model DPS 360FB) and there is no Blue wire on the 24-pin ATX power supply connector where it plugs into the mobo. Does this motherboard not use the -12V rail?
I first suspected an issue when SpeedFan showed -1.17V on the -12V rail. I've done a lot of searching and didn't find anything.
Any help appreciated. TIA
I couldn't find much on it but I found an Ebay listing of a power supply like yours. The model number you placed is a generic one for that PSU but there is still another that goes along with it. Check this out.
Yea, mine claims to be a 350W supply on the sticker.
But that still doesn't answer the question of whether -12V is used on the mobo and if so, how come the blue wire (Pin 14, -12V) is missing on the ATX connector?
Besides the fact that Speedfan is reporting the wrong voltage, the computer seems to be working ok. Just trying to understand the PSU weirdness.
Can you try and find me the exact model AND part number for your PSU? As well as the breakdown of voltage like in the ebay link I posted
Thanks for your assistance. Whenever I google the model, I get the same thing you got ... replacement power supplies that are higher Wattage. I think that I have the correct model number. I believe that model number shows up in your ebay link because it's a replacement for my power supply. Please correct me if I'm wrong.
I checked the original configuration on Dell's website per the service tag and could not find the PSU listed there.
If I look on the power supply itself it says:
Model: DPS-360-FB-1 A REV: 01
12VA / 15A
12VB / 16A
+5V / 18A
+5aux / 2A
+3.3 / 17A
MAX POWER 360W
THE COMBINE POWER ON +12VA & +12VB TOTAL 300W MAX.
+12VA & +12VB : 300W
THE COMBINE POWER ON +5V & +3.3V & +12VA & +12VB TOTAL 350W MAX.
Does that help? All my searching finds replacement power supplies for this model but not this exact model.
Looking at that breakdown, it looks like it's your power supply that isn't using the -12v Rail. I'm a little confused though. You have two 12v rails but both seem positive.
Yea, I'm confused to. If you look at the link you gave, the supply specifies the -12V rail at only 0.8A. I read somewhere that mobos use the -12V rail for serial ports. There are no serial ports on this machine so maybe this Dell mobo doesn't use -12V and maybe that's why pin 14 isn't hooked up.
This is an i7 cpu, so it does have that 8-pin power connector that goes to the mobo for the CPU and that is +12V. So maybe that's why the 2nd +12V rail. I thought it was common place with this power hungry video cards to have the two +12V rails but I just hadn't seen the -12V abandoned before. Surprised others haven't run across this.
As long as your pc is running fine :D I wouldn't worry about it. The bigger issue is when you look to replace the PSU for something with more wattage
Well, I just replaced the mobo so I was hoping to verify the PSU was good and not a contributing factor.
Thanks for your help.
Hey Jim7jim, I think you answered my question above, on the 8-pin connector, it is just brown and black, but is the power across each brown +12v?