Power supply woes

Miss_Man · 12-21-2000, 11:44 AM

I have an AT Power supply connected to an ATX power supply. Will this reduce the power fed to the ATX power supply? I used to run a 600E@840 on an Asus P3V4X with around 10 fans, 1 floppy, 1 CD Drive, 1 Harddisk with the ATX power supply straight into the wall socket. Now, I'm running a 650E@962 with the ATX power supply connected to the AT power supply. The AT power supply is powering 3 fans and an 80 watt peltier. Now, my 650E@962 wont run stable if I connect a fan to the ATX power supply, while it used to power so many fans without hiccups. Does this mean connecting power supplies reduce the power?
Also, I'm going to need to power 10 12V fans, one of them pretty big, and an 80 watt peltier. How powerful a power supply would i need? It does not need to power any mobos or drives.
I may not be able to find an AT power supply that can do this so how do I turn on an ATX power supply without plugging it into a mobo?

Memphis · 12-21-2000, 11:18 PM

I'm not exactly sure but I have the feeling that you are running a lot of fans. Are you trying to get your computer to hover above the monitor or something?

Try looking at the size of the fans and go for some 110V ones wired directly into the power supply with a relay so the fans switch on with the computer.

From the sounds of it, you are pulling too much current and have too many fans. I would look at redesigning your rig because 10 fans is not needed! May look good and sound like an F16 but not practical.

Cheers

Memphis

Chill-X · 12-22-2000, 12:16 AM

How do you have the P/Ss hooked together - internally? I'm not sure I fully understand your config.

I have a setup with one ATX and one AT. I'm using a relay (yeah - old tech) powered by the ATX to switch the AT on and off with the ATX. The power supplies each have their own power cords going into a shared power strip.

Also, on the power supplies, they probably need to each have some 5V and 12V load - ie I have Hard drives (SCSI) and a few fans on the AT, and on the ATX, the Mobo, cards, and fans. That way, each has an ample 5V and 12V load. (Otherwise the AT would sag in output voltage down to around 9-10V with nothing on the 5V line).

Now if on the other hand, it seems your ATX is acting up, I suggest stripping down the system to just use the ATX P/S and no peltier. If you still have problems then with 12V, replace that P/S.

Miss_Man · 12-24-2000, 02:37 AM

Which wires do I connect on an ATX power supply to on it?

12-21-2000, 11:44 AM	#1
Miss_Man Cooling Savant Join Date: Dec 2000 Posts: 151	Power supply woes I have an AT Power supply connected to an ATX power supply. Will this reduce the power fed to the ATX power supply? I used to run a 600E@840 on an Asus P3V4X with around 10 fans, 1 floppy, 1 CD Drive, 1 Harddisk with the ATX power supply straight into the wall socket. Now, I'm running a 650E@962 with the ATX power supply connected to the AT power supply. The AT power supply is powering 3 fans and an 80 watt peltier. Now, my 650E@962 wont run stable if I connect a fan to the ATX power supply, while it used to power so many fans without hiccups. Does this mean connecting power supplies reduce the power? Also, I'm going to need to power 10 12V fans, one of them pretty big, and an 80 watt peltier. How powerful a power supply would i need? It does not need to power any mobos or drives. I may not be able to find an AT power supply that can do this so how do I turn on an ATX power supply without plugging it into a mobo?

12-21-2000, 11:18 PM	#2
Memphis Cooling Neophyte Join Date: Dec 2000 Location: Melbourne, Victoria, Australia Posts: 45	I'm not exactly sure but I have the feeling that you are running a lot of fans. Are you trying to get your computer to hover above the monitor or something? Try looking at the size of the fans and go for some 110V ones wired directly into the power supply with a relay so the fans switch on with the computer. From the sounds of it, you are pulling too much current and have too many fans. I would look at redesigning your rig because 10 fans is not needed! May look good and sound like an F16 but not practical. Cheers Memphis

12-22-2000, 12:16 AM	#3
Chill-X Cooling Neophyte Join Date: Dec 2000 Location: Tucson, AZ, USA Posts: 27	How do you have the P/Ss hooked together - internally? I'm not sure I fully understand your config. I have a setup with one ATX and one AT. I'm using a relay (yeah - old tech) powered by the ATX to switch the AT on and off with the ATX. The power supplies each have their own power cords going into a shared power strip. Also, on the power supplies, they probably need to each have some 5V and 12V load - ie I have Hard drives (SCSI) and a few fans on the AT, and on the ATX, the Mobo, cards, and fans. That way, each has an ample 5V and 12V load. (Otherwise the AT would sag in output voltage down to around 9-10V with nothing on the 5V line). Now if on the other hand, it seems your ATX is acting up, I suggest stripping down the system to just use the ATX P/S and no peltier. If you still have problems then with 12V, replace that P/S.

12-24-2000, 02:37 AM	#4
Miss_Man Cooling Savant Join Date: Dec 2000 Posts: 151	Which wires do I connect on an ATX power supply to on it?

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