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TEC with only ATX PSU?

E

euimin

n00b
Joined
Aug 20, 2005
Messages
39
Hello, my first post.

I am interested in going TEC. I like to keep the inside of my case clean and simple. So i started wondering that if i connect a TEC CPU waterblock to a standard ATX PSU. I would like to know whether

1. the TEC will "suck out" the rated wattage (say, 226W) from the PSU, stressing the PSU, or

2. the TEC will only get what the PSU "wants to" supply, or

3. I can control how much watts to give.

Thanks.
 
you are going TEC? you know that stands for "Toot Expensive Cocaine" ? right ?
well what you do with your money is your problem...

With Peltiers is better, I would say "A MUST" to use a external PSU to supply the little bastards enough juice, if you use your In-case PSU, depending on how many stuff
you got in your box and the power (wattage) the peltier may not get enough Current, so it would not cool, it would just heat up like a motherfu... well you get the picture, those little bastards suck a lot of juice and the efficency is around 40%. You could only control how many Current you give to them if you have a sophisticated PSU. When I started on peltiers I fry a CPU (a P2 300 SL2W8) using the in-case PSU !

NE more questions?
 
the pelt will draw as many watts as it wants to draw, and cook the PSU in doing so, if the pelt wants more than the PSU can put out. you need better than 200 watts for a CPU peltier, and those draw up to 25 amps, FAR more than a single 12 V rail on your PSU is rated to handle. it's more than both rails on most PSUs can do.

you can reduce how much current the pelt is using, by reducing the voltage across it. that also reduces cooling power. on something like a 226 watt CPU pelt, you don't have any performance to spare, to get things noticeably colder than straight watercooling would keep the core while overclocked.
 
so the answer is that no ordinary ATX PSU can handle a pelt, and if attempted, will set my case on fire. though i can lower the voltage going through the pelt, the performance will be no better than standard watercooling.

correct? thank you very much for great responses.
 
euimin said:
during the past few days, Enermax announced a kilowatt PSU.
http://www.hexus.net/content/beanz/beanz.php?dXJsX3Jldmlld19JRD0xNDk1
will this do the job?
Click to expand...
probably not.

that PSU's 12 V output capacity, although a titanic 66 amps, is spread across four rails. no two rails should be used to run a single device. since the power is delivered across two 18A rails, and two 16 amp rails, no single rail is enough to safely take care of a CPU pelt, since over-taxing one rail might damage other components if the one rail dies.

honestly.....with output like that, i fully expect that particular supply will cost a fortune. it might be cheaper to get a dedicated 12 V PSU of the sort that is conventionally used for pelt cooling. better still, get a 24 volt dedicated PSU, and then you can get better performing pelts in any given size that you need.
 
the problem with peltiers is that they need to be sized larger than the heat load. I just got done setting up a x800pro with a 172watt 24v@12v for ~90watts, on a DD GPU maze block. I'm getting around 7C load, but then again, this pelt, even at 24v, would get owned by a modern oc'd processor.
 
DFI Daishi said:
probably not.

that PSU's 12 V output capacity, although a titanic 66 amps, is spread across four rails. no two rails should be used to run a single device. since the power is delivered across two 18A rails, and two 16 amp rails, no single rail is enough to safely take care of a CPU pelt, since over-taxing one rail might damage other components if the one rail dies.

honestly.....with output like that, i fully expect that particular supply will cost a fortune. it might be cheaper to get a dedicated 12 V PSU of the sort that is conventionally used for pelt cooling. better still, get a 24 volt dedicated PSU, and then you can get better performing pelts in any given size that you need.
Click to expand...

not to mention that 2 of the rails are dedicated to dual CPUs
(or quad dependant on the mobo power distribution scheme)


EPS12V 6.1.1 12V Power Rail Configuration

There are two types of 12V rail configurations for systems: 'Common plane' and "Split plane' processor power delivery. The 'commob plane' system has both processors powered from a single 12V rail (+12V1) from the power supply. The 'split plane' system has both processors powered by seperate 12V rails (+12V1 and +12V2) one dedicated to each processor. The system in both cases, has an additional 12V rail to power the rest of the baseboard +12V loads and dc/dc converters. +12V1, +12V2 and +12V3 should not be connected together on the baseboard to ensure that 240VA protection circuits in the power supply operate properly

Table 6: 12V Rail Summary
........................................................................................................................................................................................
Common Plane System........................................................Split Plane System
+12V1........Processors.........................................................+12V1........Processor 1
+12V2........Baseboard components other than processors.......+12V2........Processor 2
+12V3........Drives and peripherals..........................................+12V3........Baseboards and components other than processors
...........................................................................................+12V4........Drives and peripherals
Click to expand...

like the PCP&C 850SSI, the Enermax Galaxy is a Server System Infrastructure Compliant EPS12V Split Plane Supply ;)
 
Ice Czar said:
not to mention that 2 of the rails are dedicated to dual CPUs
(or quad dependant on the mobo power distribution scheme)




like the PCP&C 850SSI, the Enermax Galaxy is a Server System Infrastructure Compliant EPS12V Split Plane Supply ;)
Click to expand...

therefore if you run it in a common plane system mode, you will have the extra 12V4 rail handy which is not limited in what it can be connected to, and thus can be connected in parallel with 12V3, giving a minimum of 32 and a max of 36 (i dont know which rails supply which current rating) amps, at 12 volts, thats like a max of 432 watts or so, that should be enough to power a decent pelt, a pretty decent system and all the drives and whatnot, i'd say for sure

however, you are getting close to maxing out a power supplythat probably costs over 400 bucks, i'd just use your normal 4-500 watt psu for your system (which, btw, is more than enough for any dual proc sli system out there, nobody NEEDS 600 watts for a home computer, not even dual proc sli unless you have like 4 hard drives and a couple optical and like, well, you get the idea

either way, i guess its nice to have a little over-rating, but the kW psu is just pointless, get two psu's if you really want to do pelt, otherwise jsut go water ;)
 
no
the "extra" rail is attached to the 24 pin mobo connector

Id recommend ordering the wire harness custom (which you can do at PCP&C) or do it yourself

and just for general info, My PCP&C 510 has no problems running dual 244 Opterons, 4GB of PC2700, 10 HDDs, FDD and DVDRW w\ a Quadro FX3000

and thats a single +12V rail supply (w\ 1% load regulation of course)
Ive never seen the +12V even blip
 
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