Can you use a seperate psu to power a watercooling system?

pastymuncher

pastymuncher

pastymuncher

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As in the title. If so how do i get it to power up without a motherboard. I know there is a way you can short, presumably, the 20/24 pin plug but is this safe or is there a safer way as this will be permanent.

My watercooling rig will be cooling only my 2x BFG 7800gt's and nothing else. The pump, reservoir, radiator and fans, psu etc will be in a purpose built box bolted to the underside of my desk with a slot cut in the desk top to fit the rad and let it blow its hot air upwards. The reason i am doing this is that at the moment my 2x BFG's are blowing air out the front of the case straight at me and it gets ridiculously hot when they are working hard. On top of that the heat that can't get out of the case is building up in the case and temps are rising. Yes i could get AC heatsinks but i don't trust AC anymore after a Freezer 64 let all its fluid go everywhere inside my case one day. Anyway i don't want to go back to dual slot cooling. Zalman coolers would be just as bad as it is now, if not worse.

The answer, get the heat out via water cooling.

So rather than run a very, very long extension from my psu to the box i want to put it's own small psu in there to power the pump and fans etc. Can it be done?

Many thanks in advance for your replies/advice.
 
Thanks for the replies so far guys. It won't be a problem forgetting to turn the extra psu on as it will be plugged into the same antisurge extension as the pc. What i want is for it to run seperately so that i can leave it on after the pc has shut down for 10-15 minutes so it will keep circulating water for a while. Just like some psu's keep the fan running after shutdown. Also this would greatly help with setting up, bleeding the system and the initial 24hrs leak test.
 
That is excellent and just the info i was looking for. Am i right in thinking then that these AT psu's were of the old type when the operating system told you it was ok to turn off your pc? If so sounds just what i need then. Is a Eheim 1250 240v mains with a standard 3 pin plug? I looked on their website and everybodys that sells them but it does'nt actually say. The DD D5 which is 12v is either out of stock or ridiculously overpriced at the ones who do have it so it looks like the Eheim anyway.
 
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