• Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
    Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.

Without a mobo

L

linger

Limp Gawd
Joined
Sep 18, 2004
Messages
290
I'm setting up a water-cooled system and i wanted to put everything in a seperate box. I wanted to know how i could setup a powersuply with no mobo to turn on and off by the press of a button.
Also i'm going to have 2 120mm fans, 1 dd 12v pump, 1+ ColdCathode, and a led or lcd display for temps. How much power do you think i would need?
thanks
 
rig a button between the green lead on the ATX connector and any black (ground) lead on the ATX thing.
as for the power requirement, I think not very much.
 
many ATX supplys will not turn on without a load
even with the GRN to BLK trick, so for testing purposes add a HDD, Optical or the components you plan to power
a HDD or Optical will put a draw on both the +12V and +5V rails,
different PSU require the load on different rails

alternately use a relay
you'll never "forget" to turn the pump on ;)
however there are sometimes advantages to having the pump run "long" to cool the CPU after shutdown
(or in the event of a chip chiller to "pre-cool" as well before startup)
such automated devices can be built or bought, and failsafes as well

http://www.procooling.com/articles/html/cpu_overtemp_power_shutdown_ho.php
http://www.procooling.com/articles/html/ph_s_guide_to_wiring_pumps_-_p.php

you should look up the amp draw on the pump as the primary load
then add a bit more for the other components,
also keep in mind that the capacity of the PSU will drop with the rise in temperature in that enclosure,
so give careful consideration to its airflow

while most of the energy from the pump will be transfered to the water (pump heat) in the form of kinetic energy,
there will be some convection and radiation to the enclosure, the PSU will exhaust that for you
 
thanks for the help, but do you know of any way to have a power button on the front of my water-cooling case that would turn the PSU on w/o a Mobo? Or is there a way to run the DD 12v pump & fans without a psu?
 
Bugalaman answered that, you would add a switch inbetween the green and the black wires on the main power connector, so 2 wires from the connector to the front of your case and the switch

as far as powering a pump without a PSU, sure if its an AC pump, or AC fans
otherwise if its DC youll need an AC to DC power supply
 
alright thanks for the info, i've been a little tired lately because of school and i just havent been reading things right. Anyways i appreciate the info, and it will be usefull in the future when i finally get my project started.
 
Hmm my FSP 530 started with just a jumper.. I leak tested my water cooling that way...
 
k thanks i know you've told me that so many times, and its probably a little annoying now :)
 
You could always get a real cheap AT powersupply and use it. Works great for me ;)
 
its OK

the Green is the Power Good Signal *(extremely low volatge) and the Black is the Ground
all the mobo does is short those 2 together when its ready to accept the full power (as oppoosed to the +5VSB (Voltage Stand By), that runs wake on LAN, wake on WAN ect
and is on as long as the PSU is plugged in to the outlet, the mobo and turned on


always turnoff the PSU (if it has a switch) or unplug it, when working on the board
if you can actually turn it off but leave it plugged in there is a slight advatage as it grounds the case
if not definately unplug it from the board or the outlet
especially when swapping out RAM or cards
 
lol, I always mess around with the power on, heh (it'll give me a reason, if I fry something, to get a new computer :p). Though, when I do remove ram or my vid card, i do flip off the switch on the PSU.
 
Jima13 said:
I keep one of these in my tool bag> http://www.cyberguys.com/templates/searchdetail.asp?T1=131+0560
Click to expand...

and its reasonably priced ;)
Id consider that if I did more "in field" work (hell I'll probably get it anyway)
as its is, Ive got the wrist strap, grounding mat, a grounded alligator clip for the case (all a common ground with LED indicator)
and humidified environment for tear downs

my > ESD & Electromigration Rant :p

Im paranoid in direct relationship to the cost of the components
I dont get too worked up about fiddling with a K6 or P2
but I get very serious with the Opterons and 4GB of ECC :p
 
You must log in or register to reply here.
Back
Top