X³, my new cascade, three stages, and two evaps !

[the_new_guy]

with this rig, not air cooled wr, to set a air cooled wr go to Antarctica in the middle of the night, i fans all u need.

[Tyrou]

I achieved a 5383Mhz screenie, but it was corrupted :/

My current single stage is a bit screwed up, I can only get -2C idle @ 5Ghz / 1.7V, I'll fix it next week too

[the_new_guy]

what cpu?

[Tyrou]

P4 670 on an Asus P5WD2

just got a validation from CpuZ at 5367 :

http://valid.x86-secret.com/show_oc?id=39543

[Tyrou]

5404Mhz validated now : http://valid.x86-secret.com/show_oc?id=39553

I'll unmount my single stage, then wait for the X³ now

[gclg2000]

Anyone want to comment how ethylene holds load temps vs CO2 rather than just lowest temp???

-100C is -100C....can't believe he even said that.

[Tyrou]

Please, don't start a flame war here, we'll not fight for that kind of stupid things...

I hope I'll have my pzrs on next week, I want to bench, I've made a stock of good cpus, they're withing for xtreme coldness

[the_new_guy]

why do chips run more stable under extreme cold?

[Levish]

I think heat has something to do with processors leaking current, or something along those lines.

[metalman2785]

why do chips run more stable under extreme cold?

I wrote an FAQ on this for antoher forum, enjoy. First post!

As most of you know colder temperature, especially extreme cold, is very beneficial for overclocking. I am now going to explain why this happens from a Material Science standpoint.

First Equation that you need to understand is Ohms Law.

1. Ohms Law states that: V=IR

Where V is voltage, I is amperage, and R is resistance. Higher voltage means more amperage or less resistance.

A step up from this equation is the resistiviy equation. Resistivity is a mechanical property, different than resistance. The relationship between resistivity and Resistance can be seen in equation 2. Resistivity is dependent on Temperature, resistance is not.

2. R = P L/A

In this equation P is going to be resistivity, R is resistance, L is length (such as length of a wire), and A is cross-sectional area (of a wire). We can see that as P (resistivity) increases The resistance will increase. A larger cross sectional area will also increase Resistance.

The final equation to tie this all together is the conditions effecting resistivity. There are 3 major things that will determine the resistivity of a material. They are temperature, impurities, and deformation.

3. P (total) = P (thermal vibration) + P (impurities) + P (deformation)

P(total) is the total resistivity, and the other P's are the factors of resistivity. This equation shows that the higher the temperature, the more thermal vibrations will occur, thus causing a higher resistivity. At extremely cold temperatures such as -100 C the thermal vibrations of the atoms will be much smaller then at room temp. These smaller vibrations translate into a loss of less kinetic energy. This means that effiecency is greatly improved at cold temps. You will get a higher overclock with less voltage at these extreme temps. The other two factors, impurites and deformation also play a role in resistivity. A high purity copper with a mirror finish will have a very low resistivity.

[the_new_guy]

hey cool
thanks for info,
i had an idea that it had some thing to do with drop in Resistance

[OpTiX]

awesome pics man, i cant wait to see your ~-120C pics

[Tyrou]

nice idea to bump this thread

I'll post a ton of new pics today, including how to insulate a -100C evap without putting anything dirty on your motherboard

I may have my new third stage gas tomorrow, if that's the case, I'll keep the thread up to date

[Weee]

Nobody will give cookie a to the one who shows a -350C screenshot

No cookie, but you'd probably be bashed for a fake (or get nobel prize) since its almost 80K below absolute zero.

Beautiful cascade!

[Icy]

amazing work man. out of intrest where did you buy those liquid line filter dryers from?

[da-key]

Very nice temps! One hell of a setup. Good luck on the record breaking!

[boodhir]

tyrou

Beautiful cascade!

@+

[Tyrou]

Weee : I study physics at the university, that was not serious

I bought my dryers at a local HVAC shop, two with 1/4" flare fittings and a 3/8" flare for the first stage.

A friend of mine will provide me with some methane today, I'll have that this afternoon, so I'll be able to charge my third stage with a better mix, maybe we'll see -120C tonight

Pics will also come today

[RussC]

Wow, that system is huge, right up there with the "Mother of all Cascades". Nice work. Not sure why I didn't look at this thread before. Anyway, nice work, look forward to the results.

RussC

Weee : I study physics at the university, that was not serious

I bought my dryers at a local HVAC shop, two with 1/4" flare fittings and a 3/8" flare for the first stage.

A friend of mine will provide me with some methane today, I'll have that this afternoon, so I'll be able to charge my third stage with a better mix, maybe we'll see -120C tonight

Pics will also come today

[Tyrou]

thanks RussC

From the date I posted this thread, I also replaced the first stage compressor (1HP), which was not strong enough to hold the load of the two lower stages, I now have a 1.5kW rotary compressor, making the whole cascade draw 3kW

I'm turning nuts waiting for methane, this morning, I already double checked how everything is working and prepared the setup for the new gas

[LowRun]

I'll post a ton of new pics today, including how to insulate a -100C evap without putting anything dirty on your motherboard

[the_new_guy]

1.5kW

What are you blending with methane? or going just methane?

[serial_killer]

I'm expecting this :
First HX : -40C
Second HX : -90C
Evaps : -110C

I aim at -100C loaded, I don't care too much about unloaded temps

Well I think that -100c should not be any problen whit that cascade. Nice job man. That is very clean job.

[Tyrou]

So much grettings deserve more pics

that's how it performs :

first stage, alone :


both first and second stage on :


third stage, without methane :


I need to improve my second stage's capacity to use methane efficiently, for now, everything I got with it was higher discharge pressures and only a few degrees lower, that was not worth it.

I also made a few changes, now, my evaps are independants, each one has its own CPEV, so I can tunr on only the gpu evap, or the cpu evap, or both





More pics will come in a few days, I'm too busy trying to get some good numbers in 3D05

[piotres]

SWEET

Specially 1st stage works GOOD

Which comp do you have on which stage ?

Nice idea with those 2 CPEVs ...I have never seen that till now

Regards
Peter