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| Author |
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vivekm1234
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Connecting a SMPS to a mobo
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May 15 15:42 UTC 2006 |
I have a old PC, a Cyrix 233MHz. You have to press a switch(functions like
a light-switch) to power on and off. The Motherboard supports ATX and has 2
pins for a "Power Switch" and 2 more pins for "Reset".
My SMPS (power supply) is 233Watts and has 4 wires going to the above
mentioned switch. I wanted to know if there was a way to auto-poweroff this
PC? Right now i have to toggle the light-type-switch on and off.
I was thinking of hooking up those 4 wires bypassing the switch. The SMPS
would then be always "ON" and feed power permanently to the mobo.
To switch the mobo on and off i was thinking off hooking the reset switch to
the 2 power-switch pins on the mobo. Would this enable the
"Auto-power-down-feature" so that when i shutdown the mobo will switch off.
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| 9 responses total. |
ball
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response 1 of 9:
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May 15 23:41 UTC 2006 |
Cyrix MII 233 MHz? If the power switch is latching, you
probably have an AT PSU rather than ATX. If your mainboard
supports APM (possible) or ACPI (unlikely) you may be able
to configure it to enter a light sleep if it's left alone
for a while, and perhaps even suspend (to disk, or perhaps
to RAM) until it's woken by an event such as a phone call, a
"magic packet" or perhaps hitting a power key on the key-
board.
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vivekm1234
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response 2 of 9:
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May 16 02:11 UTC 2006 |
Yep Cyrix MII 233 MHz. Yes the power switch is latching. Yes it has APM and
can enter light sleep, doze disks etc.
I wanted to switch it off. The UPS is common with another comp and i don't
want this Cyrix drawing power.
,
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ball
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response 3 of 9:
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May 16 05:51 UTC 2006 |
How much power does it draw when suspended?
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vivekm1234
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response 4 of 9:
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May 16 12:32 UTC 2006 |
Re #3 No idea, i don't have a wattmeter. The fan makes a lot of noise as well!
I suppose the only way would be to buy a new SMPS?
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ball
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response 5 of 9:
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May 16 15:15 UTC 2006 |
The new PSU would cost more than the machine's worth and
would only work if your mainboard had an ATX power
connector and if you fitted a momentary power switch to the
case. My machines draw little when suspended. Can you
borrow a Wattmeter (or at the very least an Ammeter)?
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vivekm1234
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response 6 of 9:
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May 17 04:47 UTC 2006 |
Hey my UPS can specify current output power! I just need to plug a PC directly
into the mains and then measure UPS-output when the othe PC is shutdown.
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ball
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response 7 of 9:
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May 17 23:27 UTC 2006 |
Let us know what you find out.
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vivekm1234
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response 8 of 9:
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May 21 16:37 UTC 2006 |
Both PC's running full blast: 17inch monitor, mobo, drives, hard disks, fans,
SMPS, Speakers, Modems consume around 210Watts.
If i switch of the 17inch PC, power consumption drops to 100Watts, the Cyrix
PC consumes around 40Watts minus the 15inch monitor.
There isn't a big difference in power consumption between the 17inch Celeron
400 and the 15inch Cyrix 233! Both consume around 100+-10-15watts each.
I haven't tried the PC in hibernate mode. Having some problems..I'll try it
later.
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gull
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response 9 of 9:
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May 25 17:55 UTC 2006 |
Yeah, you would think the 400 MHz system would draw more power, but
even as processors have gotten more power-hungry, hard disks and other
peripherals have gotten more efficient.
I find, lately, that processor power consumption/heat generation has
gotten to the point where one of the biggest challenges in building a
system is effectively getting the heat out of the case. This is
especially true of rack systems, where you only have the end panels to
work with. The desktop system trick of ducting an opening on the side
panel straight in to the processor fan doesn't work because that area
is likely to be blocked by whatever's racked in the next slot up.
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