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Helium results!!! Window air con chill box build. - Page 11

post #101 of 118
Thread Starter 
I understand overall power consumption will go up...I was thinking more specifically of just the cpu, Leakage of current in the cpu increases with increased voltage and higher temperatures, this in turn leads to increased power consumption and heat production in the cpu.

I was just hoping that the already low temps I'm operating at will have reduced the cpu's power consumption to a level that the pelt I've bought can deal with as Drew was suggesting the pelt may be a little under powered to cool the cpu.....but it's something I'm just going to have to try to know for sure.

There you go...just found a graph of what I'm talking about with the 3770k, other sites are quoting a power draw of 240watt for the cpu at 4.5GHz under ambient cooling, so by reducing the temp to +30c the power draw is reduced by 50% to 115w...If this translates to the quoted psu calculator power usage for my Q6600 of 200w at its current oc and voltage then it should only be drawing about 100w at my current loaded temp of +30c and be well with in the pelts ability...I'm actually hoping to hit -10c loaded not +30c as that's my current temp...which will only make it more likely that the pelt will cope fine.

powertemp.png

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And here's a graph for overclocked prestler which shows similar results, so it's not just an Ivybridge characteristic.

prestler.jpg

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Edited by technogiant - 7/15/12 at 3:25am
post #102 of 118
I would just take some insulation material and make a little koozie for the capacitors, wrap them in a little bundle and they'll probably keep plenty warm.
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post #103 of 118
Thread Starter 
Quote:
Originally Posted by LtStinger View Post

I would just take some insulation material and make a little koozie for the capacitors, wrap them in a little bundle and they'll probably keep plenty warm.

I'll have to get the misses knitting lots of tiny little woolen hats...lol
post #104 of 118
Thread Starter 
I've been reading some more info on pelt/tecs and it seems that you have to have a qmax about twice as large as the load you want to cool...so don't think the one I have is powerful enough......tbh although I wanted to add some heat load to the chamber I think the wattage I'd need to use with a pelt would be too much and be detrimental to chamber temps.

I'm going to knock the pelt idea on the head, I'm more than happy with my cpu temps and flood back doesn't seem to be an issue even when the chamber dropped to -30c during longer periods of inactivity...so think I was solving a problem that wasn't there really.

As regards getting a better heat sink...I'll just get myself a zalman 7500cu series...solid copper construction so no worries about heat pipe freezing.

Yeap...think this is pretty much job done.....during gaming session the other night my gpu's barely rose above 0c (although gpu usage was only 30-40% due to nvidias active vsync) and cpu temps weren't registering in core temp......put that together with chamber temps that were varying between -30c to -25c and tbh I'm more than pleased with the results.

Next job will just be upgrading my system.....probably go for a SandyB......so anyway guys....thanks for your interest in my build and all your help and support...it's been great fun.thumb.gif
post #105 of 118
Wowo.

Happy to stumble on to this, great working OP and keep trucking!

...lachen.gif

knit little hats.

althought

..foam rubber would be very appropriate for that. It could then be shaped.into little top-hats.
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post #106 of 118
funny i was thinking little rubber caps or nubs. This thread will make for good quotes. :>
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post #107 of 118
Excellent job Technogiant!!

Did you ever get updated hardware? I am dying for an update on this. I think it would be fun to pick up some older hardware and just see how far you could go with it in these temps.

I was just thinking, I live in alaska and I bet it wouldn't be difficult to do this here as some of the state maintains -10F or lower during the winter.
    
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post #108 of 118
Thread Starter 
Yeah sorry guys for the loooong period without an update.

Yes I did indeed update my hardware......I'm running a Gigabyte Z77X-D3H with a 2700K.......I'm really pleased with the result.....I can run her at 5.5Ghz and vcore 1.49v and she's stable for normal use.

For the intel burn test highest is 5.4Ghz at 1.51vcore...but that benchmark is a beast and drives my cpu temps up to between 60-70c at those settings .

I got my self a solid copper cpu heat sink...Zalman 7500cu led......gives much better cooling than my old akasa.....I've also reversed the chamber air flow so that it blows directly from the evap onto the mobo which shaved several more degrees off the temps.

In the next few days I'm going to be experimenting a little further and I've got some longer term plans I'm hoping this will also work towards......I'm going to change the gas in the cooling chamber.....I've toyed with the idea of several different ones but I've decided on helium.....firstly because it is inert and I need an inert gas in the chamber for the next stage of my plans....also it has the potential to cool more effectively than air....it has 5X the specific heat capacity of air and 7X the thermal conductance of air.....also as it's lighter I'm guessing the fans will push around more cfm although it is more viscous and that may impede it passing through the evap.

My main concern with this is that it will escape from my chamber too rapidly and be too expensive to keep it topped up.....but it's not overly expensive to try at least as an experiment.

In the longer term I want to put a cooling loop in the chamber similar to a water cooling loop but without any water. The loop will be attached by a breather tube to a large external expansion chamber and contain a gas that will liquify as the chamber cools to working temps......so the loop will have liquid gas pumped around it rather than water and the components will be cooled by phase change as the liquid gas is pumped through their cooling blocks.

Trouble is the only readily available gas that has a boiling point in the area I need is flammable, hence the need for a background inert gas in the chamber just in case of any leakage of the flammable gas into the chamber.

But the cooling loop will come later......hopefully helium testing in the next week.
Edited by technogiant - 10/25/12 at 12:22pm
post #109 of 118
Quote:
Originally Posted by technogiant View Post

Yeah sorry guys for the loooong period without an update.

Yes I did indeed update my hardware......I'm running a Gigabyte Z77X-D3H with a 2700K.......I'm really pleased with the result.....I can run her at 5.5Ghz and vcore 1.49v and she's stable for normal use.
For the intel burn test highest is 5.4Ghz at 1.51vcore...but that benchmark is a beast and drives my cpu temps up to between 60-70c at those settings .

I got my self a solid copper cpu heat sink...Zalman 7500cu led......gives much better cooling than my old akasa.....I've also reversed the chamber air flow so that it blows directly from the evap onto the mobo which shaved several more degrees off the temps.

In the next few days I'm going to be experimenting a little further and I've got some longer term plans I'm hoping this will also work towards......I'm going to change the gas in the cooling chamber.....I've toyed with the idea of several different ones but I've decided on helium.....firstly because it is inert and I need an inert gas in the chamber for the next stage of my plans....also it has the potential to cool more effectively than air....it has 5X the specific heat capacity of air and 7X the thermal conductance of air.....also as it's lighter I'm guessing the fans will push around more cfm although it is more viscous and that may impede it passing through the evap.

My main concern with this is that it will escape from my chamber too rapidly and be too expensive to keep it topped up.....but it's not overly expensive to try at least as an experiment.

In the longer term I want to put a cooling loop in the chamber similar to a water cooling loop but without any water. The loop will be attached by a breather tube to a large external expansion chamber and contain a gas that will liquify as the chamber cools to working temps......so the loop will have liquid gas pumped around it rather than water and the components will be cooled by phase change as the liquid gas is pumped through their cooling blocks.

Trouble is the only readily available gas that has a boiling point in the area I need is flammable, hence the need for a background inert gas in the chamber just in case of any leakage of the flammable gas into the chamber.

But the cooling loop will come later......hopefully helium testing in the next week.

Thanks for the update, and nice results with the new setup. 5.5ghz is quite impressive. Although your temps are quite high compared to your previous setup, so is your frequency, and I would imagine your thermal load as well. Let us know how the helium works for you, I am curious to see how it works. It should work better than atmospheric air due to its better thermal conductivity however I am no physics geek or scientist for that matter. I was unaware that helium is more viscous than atmospheric air, this could impact your CFM, but I am just speculating at this point. Let us know what you find when you make the switch.
post #110 of 118
Thread Starter 
Quote:
Originally Posted by Mattb2e View Post

Thanks for the update, and nice results with the new setup. 5.5ghz is quite impressive. Although your temps are quite high compared to your previous setup, so is your frequency, and I would imagine your thermal load as well. Let us know how the helium works for you, I am curious to see how it works. It should work better than atmospheric air due to its better thermal conductivity however I am no physics geek or scientist for that matter. I was unaware that helium is more viscous than atmospheric air, this could impact your CFM, but I am just speculating at this point. Let us know what you find when you make the switch.

I'm well pleased with the results, my previous system had some kind of a problem with the ram.....I couldn't push it as far as I wanted, the ram and mobo didn't seem to play nicely together.

It's night and day with the new setup which has allowed me to push it further......hence the higher cpu temps.
Tbh though I've read that anything over 1.5vcore can cause cpu degradation in the longer term so I've dialed it back to 5.0GHz and 1.36vcore......my system is now gpu limited in every game I've tried and there is no advantage in running at 5.5GHz as opposed to 5.0GHz.

Here's my IBT temps at 5.0Ghz.

ibt50ghzturbooffhyperto.png

Uploaded with ImageShack.us



Individual core temps from 23 -33c.....not too bad.

And in more normal use scenario......some temps after multiplayer BF3...which is quite cpu intensive. Cpu core ranging from 0-15c
and gpu's at 12-20c..completely maxed out.

bf3cpu50ghzgpu960mhz.png

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And some Unigine Heaven benchmarks.

heavencpu50ghzgpu960mhz.png

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Cpu temps 0 - 12c and gpu's 15c and 25c
Edited by technogiant - 10/25/12 at 11:30pm
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