WR SuperPi 1M and Pifast using Chilled AIR ?????

[Oldscarface]

BigTyphoon is the suckiest cooler for subzero temps like all heatpipe coolers are..
I tried my Opt 146 last winter with -10'C ambient temp, liquid in pipes frozed = CPU temps around +50'C
Best temp for TT BigTyphoon is -2'C..

Best cooler (no heatpipes) for real low subzero ambient temp is ZM7700 with 120mm Delta EHE

Indeed, the Big Typhoon (all heatpipes coolers for that matters) are not the best coolers for subzero temps.
I'am busy with creating a home made cooler from aluminium.
Hopefully that will work for subzero temps.

[charlie]

Why?

because right now we're all very interested in subzero AIR cooling and the air cooled TEC is a poor performer in 24C ambient conditions... call it "geek curiousity"

[Oldscarface]

Nice air cooled record .. just ahead of mine

http://img180.imageshack.us/img180/5...aircooliv0.jpg

I have to wait for mother nature to provide my cold air and this global warming is playing havoc with my overclocking plans.

I'll see if I can beat your score this weekend, however i have just moved to an nvidia 680i board and reports indicate that they are slow for Superpi so I might be lucky to get below 12s I think. Should be better for 3d.

Regards

Andy

Very nice score zakelwe .
What kind of Cooler did you used and what were the temps ?
Did you use just AIR or also Chilled AIR like me ?

[wittekakker]

because right now we're all very interested in subzero AIR cooling and the air cooled TEC is a poor performer in 24C ambient conditions... call it "geek curiousity"

It will be even worse below zero.

[charlie]

It will be even worse below zero.

lol... and why do you believe that?

The hot side of a pelt will easily reach 80C-100C, resulting in heatsink temps similarly high...cooling the heatsink off by even 40C would result in great temps. I think what you're TRYING to justify is the fact that TEC's don't gain efficiency at very low temps on the "hot side". But with the inherant inefficiency of a air cooled heatsink on the hotside this would be no concern. I doubt even with -40C ambient that the hot side of pelt would EVER be below 20C.

Class dismissed.

[wittekakker]

Ah okay, I'm finally see what you want to know, I thought you wanted to know if it would be better to use a TEC with extreme aircooling.

Well, while xtreme air + high-end TEC might not work, it could be possible that a low-end TEC's combo might result in better CPU temps. Remember that Italian dude with his extreme TEC chiller

[charlie]

Water cooled TEC's actually work pretty well... so I figure maybe frigid air > 25C water??

[SLi_dog]

12.313s @ 4132MHz ~20c ambient with really slack sub-timings (ie default). I'll try to get on the case this weekend, but I have been sidetracked by playing around with vista.

Chat later J,

Maff

Those Cellshocks should do it

J

[zakelwe]

Very nice score zakelwe .
What kind of Cooler did you used and what were the temps ?
Did you use just AIR or also Chilled AIR like me ?

Hi,

It was a tuniq tower with 200cfm 170mm fan blowing on it. Ambient was 4C and that is just air in my shed. Asusprobe reported the cpu temp at only 35C at 1.65v.

Now I have gone to 680i chipset so might have problems replicating that feat, however I got it as I mainly do nvidia 3d benching. I was messing around with it last night and could do 3dmark2001 at 4100 but when I tried to boot at 4300Mhz it would not. I think that if I could use clockgen when available or could get ntune to work properly I might be in with a chance however 680i seems to be getting a reputation of being slow for Superpi, at least with the current BIOS. I did do a 12.5 last night at 4100, not sure how that compares though as I am no way a Superpi master at all. My feeling is though it should have been about 12.2-12.3.

I think it may be a long time before I see the right side of 12s again, however it is still getting colder and I do have 1.8v to play with now for cpu ( 1.75v including droop ).

Good luck with your new cooler and future runs, post them up so we can see if you can crack 11.5

Regards

Andy

[zakelwe]

Water cooled TEC's actually work pretty well... so I figure maybe frigid air > 25C water??

I agree Charlie, I think a TEC will work quite well with very cold air and these new large area heatsinks. In the old days the heat capacity of the heatsinks was not enough for the cpu + tec and also heat used to soak back through, however I did some testing with a BT a while ago in ambients of about 7C and it did manage to hold the Peltier on it's own at about -10C. However no Cpu was involved in that test so I think the ambients would have to be a lot lower, say -10C and lots of cfm applied.

I still don't understand how heatpipe heatsinks do not work well in cold weather. The temp mentioned by Dani was -10C but if the cpu is running at 50C then the heatpipes will be well over 0C . The liquid in them is a type of oil isn't it ? If that is the case then oil should not freeze at all. maybe it gets very sluggish but if that is the case then the cpu should heat up and so should the liquid so acting as feedback. Puzzling

I'm hoping to get to find out myself but it rarely gets as cold as -10C in the SE of England. Damn the Gulf Stream!

Regards

Andy

[wittekakker]

From what I've red before, it was more like that there was a gas inside working on the principle of phase change cooling. Heat-up at the base -> evaporate -> coold down due to the cooled heatsink -> forced flow back to the base. This mini phase change thingy is designed for 20°C ambient temperatures (a bit more or less, you know what I mean). Still I don't know why it doesn't function anymore at low temps. When the heatpipe fails the base will get hot. Since the heatpipe is vastend to the base it should follow to heat up. At a certain point you will see that there is no temp gain, although ambient temp might be 10°C lower. Maybe the heat pipe's mixture was frozen and it needs some time to work properly again.


Considering the air cooled TEC, what was the TEC's Qmax?

[DStealth]

I'm testing my new l629B475
20* ambient
Tt big Thypoon + crappy Titan 70cfm
1.575v set in bios 1.52-1.53 load
Can pass 4200 1M but my best time is @4176
12.156 sec


I'll test it, when the weather becomes colder and with better fan and would rise Vcore.
I like my CPU very much Orthos @ 3900 1.43v real under load 70*

[Oldscarface]

I'm testing my new l629B475
20* ambient
Tt big Thypoon + crappy Titan 70cfm
1.575v set in bios 1.52-1.53 load
Can pass 4200 1M but my best time is @4176
12.156 sec


I'll test it, when the weather becomes colder and with better fan and would rise Vcore.
I like my CPU very much Orthos @ 3900 1.43v real under load 70*

Very Nice score DStealth.
I have tested shortly my CPU with standard AIR (room temps where 21 degrees) and I was able to get around 4152-4164 MHZ with a time of 12.208 sec (don't know it exactly anymore).

Tommorow I will try to get as high as I can with Orthos and on standard AIR.

[HermS]

Ah, I had a go at beating this time, but I fell short I'm afraid, I think I've ran out of FSB. hehe, a 10x multi would come in handy now.

Here's where I got to last night:-

9 x 464 (4183MHz) 1:1 3-3-3-1
Vcore - 1.6v
VMCH - 1.9v
VDIMM - 2.56v


I've got a new-found respect for your achievement now oldscarface, that's an amazing time you got!

[splmann]

Here my best Chilled Aircooling Result !

SPLMANN/ E6700ES B1 @4196MHz/ 1,65V/ FSB 466/ 2x512 Mushkin Redline @466CL 4-4-4-4 1:1/ LuKü/ 12.078 s



I like Wintertime in Switzerland !!

[DStealth]

I'm testing my new l629B475
+12* ambient
Tt big Thypoon + crappy Titan 70cfm
1.55v set in bios 1.49-1.51 load
@4230mhz
12.000 sec


sooo close to 11.xxx mark

The time is done with 1066 bootstrap on my DQ6 and Win server2003 + ramdisk

[zakelwe]

Some excellent air cooled benching going on here. Not too far behind the LN2 guys ( semi joke )

Regards

Andy

[learners permit]

Have to say well done! Cheers firken incredible work there!

[Oldscarface]

I'm testing my new l629B475
+12* ambient
Tt big Thypoon + crappy Titan 70cfm
1.55v set in bios 1.49-1.51 load
@4230mhz
12.000 sec


sooo close to 11.xxx mark

The time is done with 1066 bootstrap on my DQ6 and Win server2003 + ramdisk

DStealth :
I must say that 4230MHZ with only approx. 1,5V real is very impressive.
If you can manage to bench a few time @ the same speed (4230MHZ) I know for certain that you wil get 11,xxx sec.

I have tested also the 1066 Bootstrap with the Asus P5B Deluxe WiFi, but I can not go further that a FSB of 460-465 MHZ.
So for me it is not faster.

[Oldscarface]

Ah, I had a go at beating this time, but I fell short I'm afraid, I think I've ran out of FSB. hehe, a 10x multi would come in handy now.

Here's where I got to last night:-

9 x 464 (4183MHz) 1:1 3-3-3-1
Vcore - 1.6v
VMCH - 1.9v
VDIMM - 2.56v

I've got a new-found respect for your achievement now oldscarface, that's an amazing time you got!

HermS :
Thanks
In the meantime I have a Superpi score which is better (11,844 sec.). I have a picture of it, but it is not complete, only the superpi score is in it. After that I wanted to make a picture with CPU-Z and CLockgen etc and the system rebooted. But I will manage this week hopefully to get another go for a faster time than 11,891 sec.

The home made cooler is not finnished yet, so I have to try it with the Termal Take Big Typhoon

[KingDingeling]

mhh, this subzero air cooling stuff you're all talking about gets me VERY interested in the topic! I should maybe move my PC to my balcony and have a nice OCing session (if it ain't raining >_>). anyways, lets get into OCing this 3700+ I have on air for now, maybe this turns out to be a good one.

and nice scores there mate! amazing for air!

[dinos22]

maybe you missed what he actually wrote, lol...

He said what is the WR for CHILLED AIR???????

farking hell W.R. for air while wearing red undies is that next

[runmc]

Awesome air scores guys Keep pushing Oldscarface

[Oldscarface]

Awesome air scores guys Keep pushing Oldscarface

runmc : I'am trying, but at this moment the wheather is not as I want it to be. It is still +10 till +15 degrees.
Also the home made cooler is still not finnished.

So, like everyone here, I'am praying for the winter

[TaPaKaH]

waiting for it to get really cold here...
Got a E6400 that`s capable of 4.2GHz on air 1M stable @ +10C ambient ...