PCFormat Forum Archive

I managed to get some Dry Ice action going in the week, here's what happened:

Here's some pics of the rig:













And this is the most frost I got, seems my insulation job was pretty good:





Now for some results:

E8400

E8400 - 5244.36MHz on Dry Ice

E8400 - 4908.5MHz on Air

E8400 - 5000MHz on Air, POST only

E8400 - 9.000s 1M - 5204.8MHz - DDR2-1157 5-5-5-15 on Dry Ice

E8400 - 8.984s 1M - 5220MHz - DDR2-1160 5-5-5-15 on Dry Ice - INVALID

As you can see Windows broke before I could save a CPU-z shot as well.

E8400 - 10.58.2.5s 32M - 5007.5MHz - DDR2-1113 5-5-5-15 on Dry Ice

E6750

E6750 - 4640.17MHz on Dry Ice

Celeron 420

Celeron 420 - 3401.89MHz on Dry Ice

That's the absolute max for the CPU, more volts didn't help one bit. World Record on that CPU is only 3.9GHz though.

Note: You guys have probably noticed that my board is limited to 580FSB sadly. I'm reading up on GTL's to try increase the FSB and then I'll give it another bash.

8800 GTS 512

3D Mark 2001:

89188 - E8400 @ 5104.6MHz on Dry Ice - 8800 GTS 512 @ 810/1100MHz on Air

3D Mark 2005:

28164 - E8400 @ 5007.5MHz on Dry Ice - 8800 GTS 512 @ 800/1166MHz on Stock Air

And then my Dry Ice was finished. I didn't have a lot of time to do more 3D Benchies, but I'll do some reading regarding tweaks and whatnot, and then give it another go.

Cheers

WOW, that some hectic stuff...

nice job on keeping the DI at bay...

reading that right, -74? DAMN I wish we could get that all the time...

don't know the benchies on DI but those figures look quite "wikid"...

You could, you'd need to get hold of a cryo cooler. its basically a sterling engine but being driven by an electric motor rather than the engine driving the motor. you can get farily close to 0 kelvin with them.

but i don't know what they cost. hmmm


But anyway, dude thats some seriously impressive stuff.

8O

Stirling engines and Cryocoolers

Edit: the articles rather technical but at least it will give you an idea of what i'm talking about

How can a CPU even run at -74*C ??? Do you think that reading is accurate?

Reading isnt accurate but it gives u a very good idea of what it is running at, if you look in the wolfdale thread below Wik1d's you will see mine was at -89, it even spiked for about 40seconds at -96 degrees.

I was able to achieve 5.3ghz on my chip, Wik1d board seems to have a FSB wall, or maybe even the cpu its self.

None the less a great set of results.

Byron, that reading must be off hey Just not possible. Cpu @ 1.1v with my pot only got -87 so yea ;P

Yo, awesome stuff! If I may, at what temps below 0 do CPU's start having trouble? Or doesn't it matter as long as condensation and such are kept at bay?

I34z1k wrote:Byron, that reading must be off hey Just not possible. Cpu @ 1.1v with my pot only got -87 so yea ;P

Yea....when i got that temp my pc is was running stock. Could be possible coz there is less coppper to cool closer to the core.

hmmm not a bad idea to use a stirling engine. oooh now that sounds like something to try.

Off-The-Chart wrote:WOW, that some hectic stuff...

nice job on keeping the DI at bay...

reading that right, -74? DAMN I wish we could get that all the time...

don't know the benchies on DI but those figures look quite "wikid"...

lol thanks dude!

da_ripper wrote:You could, you'd need to get hold of a cryo cooler. its basically a sterling engine but being driven by an electric motor rather than the engine driving the motor. you can get farily close to 0 kelvin with them.

but i don't know what they cost. hmmm


But anyway, dude thats some seriously impressive stuff.

This sounds really interesting, and really expensive..

TheModDoctor wrote:How can a CPU even run at -74*C ??? Do you think that reading is accurate?

Yeah that reading is accurate(ish) as Dry Ice's temperature is -78.5C and it was on a stock E6750 with an AWESOME thermalpaste spread (saw it when I took it off, awesome stuff)

DoOb wrote:Reading isnt accurate but it gives u a very good idea of what it is running at, if you look in the wolfdale thread below Wik1d's you will see mine was at -89, it even spiked for about 40seconds at -96 degrees.

I was able to achieve 5.3ghz on my chip, Wik1d board seems to have a FSB wall, or maybe even the cpu its self.

None the less a great set of results.

Yeah Byron, your temp sensor is definately broken. You can get the CPU cooler than the product you are cooling it with, thus basically the CPU can only be -78.5C minimum, anything under and it's hax.

And it's definately the board that walls, both the E8400 and E6750 walled at 580FSB, I managed to get 5 more out of her yesterday, but it's not good enough.

I34z1k wrote:Byron, that reading must be off hey Just not possible. Cpu @ 1.1v with my pot only got -87 so yea ;P

hax I really need to get a proper thermal probe.

pienkie wrote:Yo, awesome stuff! If I may, at what temps below 0 do CPU's start having trouble? Or doesn't it matter as long as condensation and such are kept at bay?

CPU's sometimes perform better under cooler temperatures, but some refuse to work (Most AMD's have coldbugs). As long as you can prevent anything from shorting and blowing up you should be fine. People use LN2 which is -196C.