Hyperthreading = Cooler CPU@idle?

CoolColJ · Post by **CoolColJ** » Fri Oct 10, 2003 1:52 am

Hmmm

I have a P4 2.8c that is overcloked.

Anyway it idles at pretty low temps, and it made me wonder, because according to Asusprobe and MBM it idles at around 30 degrees in XP, but when in the bios page the temps are around 40 degrees. But when I boot into XP, the temp starts at 40 degrees and then starts to drop back to 30 degrees at idle.
But then shoot back up under a period of time udner load.

Now when I disable Hyperthreading and boot into XP the idle temps stay at 40 degrees...

anyone notice this?

Inexplicable · Post by **Inexplicable** » Fri Oct 10, 2003 4:22 am

Yes, I've noticed this as well. If HT is disabled the extra logical CPU seems to be looping and consuming power. The temps are definately a couple of degrees higher.

CoolColJ · Post by **CoolColJ** » Fri Oct 10, 2003 11:37 pm

well mine is more than a couple of degrees cooler!

right now my CPU is idling at 27 degrees! And it's overclocked from 2.8 to 3.5 gigahertz. Motherboard is at 26 degrees. Ambient is around 15-17 degrees. And all my fans are running at 5 volts and under in my Sonata. PSU modded with Pananflo M 80mm.

Hyperthreading is pretty amazing.

Henrik · Post by **Henrik** » Sat Oct 11, 2003 2:25 am

CoolColJ wrote:Ambient is around 15-17 degrees.

Where are you/your PC, in a fridge or something?

Inexplicable · Post by **Inexplicable** » Sat Oct 11, 2003 3:38 am

In that temp my teeth would be the loudest component.

CoolColJ · Post by **CoolColJ** » Sat Oct 11, 2003 2:07 pm

Henrik wrote:
CoolColJ wrote:Ambient is around 15-17 degrees.
Where are you/your PC, in a fridge or something?

Sydney Australia! Remeber this celius degrees

It's been very cold the last 2 days even though is supposed to be spring now

Henrik · Post by **Henrik** » Sat Oct 11, 2003 2:20 pm

We use Celsius here in Sweden too (The scale was acually invented by a swede, Anders Celsius). I still think it is very cold, even when the temp is in Celsius. I went to Australia last year, and when I come to think of it, you guys don't have radiators now, do you? AC is far more common. Opposite to Sweden, here everyone has radiators, no one has AC.

CoolColJ · Post by **CoolColJ** » Sat Oct 11, 2003 2:31 pm

we have both

We do have seasons here, it goes from cold to very hot and dry. Summer is in december and winter in the middle of the year - yeah it is weird

It actually hit 8 degrees this morning - brrrr. Probably at 12-14 right now. CPU idling at 25 degrees, MotherBoard at 23 at the moment. Both my Seagate Barra IV at 24 each

It's great that the Barracuda IVs have an inbuilt temp sensor.

Henrik · Post by **Henrik** » Sat Oct 11, 2003 2:41 pm

Well, to say that you don't have radiators might have been an overstatement. But AC is still much more common, right? I spent most of my time in Brisbane (Hear the Mighty Lions roar...), which doesn't get as cold as Sydney, that might have been the reason to why I said that about the radiators.

[Really really OT] When is THE world championship starting, isn't it soon?

Go Wallabies !!! 'em All Blacks suck!!!

CoolColJ · Post by **CoolColJ** » Sat Oct 11, 2003 3:02 pm

ehhe

yeah Brisbane stay around the same temps all year round.

Yep Rugby World Cup into day 2 now

Oysterman · Post by **Oysterman** » Sat Oct 11, 2003 3:54 pm

Henrik wrote:(The scale was acually invented by a swede, Anders Celsius

Although he somehow got the idea that it was better to have 0 C as the boling point for water and 100 as the freezing point. IIRC.

blakerwry · Post by **blakerwry** » Sun Oct 12, 2003 1:06 am

With a CPU at idle it's not abnormal for the temps to be just a couple degrees fahrenheit above case temps. I have noticed this on AthlonXP CPUs when the HALT command is honored.

This does require a completely idle CPU, and background tasks like p2p programs, seti, and F@h will jack up CPU usage.