how close to ambient?

[mrsteve0924]

i just replaced my stock amd cooler with a CM Hyper TX3. dropped my temps like 15° so happy with the purchase.

my question is about the temp drop between running the fan at 50% and 100%. i only get a 2°-3° when going from 50%rpm to 100%rpm. i would think it would be more.

ambient is about 21-22°. at 100% rpm cpu temps are about 26°-28°. i guess if i think about it, it's probably difficult to get closer to ambient temps. i'm not sure.

any thoughts?

 

[EarthDog]

You are pointing out the known facts really.

Cranking on fans really doesn't help a terrible amount, especially the 'stock' fans that come with a heatsink.

Its going to be impossible to get to ambient temps without having something cooler than ambient cooling things.

 

[idkfa]

Without a coolant under your ambient temperature you won't achieve ambient temperatures. 26°C with 21°C is pretty good

+1 for ED and thermodynamics

Just to explain you the little effect of 50% RPM vs 100%

CPU Temp = Heatload / heattransfer-coefficient * Surface Area + Ambient Temp

Even while assuming a pretty big surface area it would be around 5*10^-³ m²
The variable changed by chaning your RPM is the heattransfer-coefficient, let's say it maxes out at 300 W/m²K for 100% RPM and is 150 W/m²K for 50%.
Heatload is 11W

A low CPU temperature is achieved by a big denominator.
Whether you use 150 or 300 times 5*10^-³ m² does not change that much.

Bear with me, I kept it simple, however I come to 30°C and 27°C for 50% RPM and 100% RPM

 

[doyll]

At low load/heat the heatpipes don't do their cooling cycle as fast as when there is more heat. And even at full load the fan speed often doesn't make a huge difference unless you are pushing the cooler toward it cooling limits.
I idle 27c @ 700rom and load 47c @ 1000rpm. If I unplug the fans it idles at 33c but load goes to 73c.. but raising the fan speed is only a few degrees cooler. Now if I was to overclock with more voltage added fan speed would make much more of a difference.

 

[mrsteve0924]

great. thanks for the feedback.

seems it's doin' what it's supposed to be doin'