65W vs. 95W – temperature differences

[neon joe]

Components:
Antec Solo
Abit IP-95
Zalman cpns7000
SeaSonic S12-330
Yate Loon D12SL-12, 5V

Former cpu: Pentium D 805 2.66Ghz. 95 W
Replaced by: Dual-Core 2.0Ghz. 65 W

Ok, so first of all, the Pentium D is the wrong processor to use if silence is a priority (the last time I upgraded, I hadn’t noticed the huge difference in heat output).

Anyway, I was able to upgrade this week, and I thought I’d post the difference in temps between these two.

I have one YL at the back of my HD tray (running at ~7V, using a Zalman rc56 cable, and angled toward the cpu), and the other YL replaced Antec’s stock fan (running at 5V).

Pentium D, with Zalman running at 1600rpm,
Idle temp 45 C, load 67 C

Swapped out Pentium D for Dual Core, set fanmate to lowest speed:
Idle 34 C, load 45 C

The results were much more dramatic than I expected - 10 C cooler at idle, 22 C colder at full load.



These temps were plenty low, and since I’m always looking for ways to make things quieter:
I used a Zalman ZM-MC1 to run the YLs at 5V, and the rc56 to run the Zalman fan at a constant 7V (approximate).

Results:
Dual Core, Zalman at 1300
Idle 34 C, load 50 C
Interestingly, the idle temps didn’t change (EDIT: after lowering the fan speeds)

[Joe Public]

Just for claritys sake, the Dual-Core would be an E2180 model?

Anyways, not surprised to see the difference, the Pentium Ds were pretty much an atrocity as far as heat dissipation is concerned. :p

[neon joe]

Just for claritys sake, the Dual-Core would be an E2180 model?

Anyways, not surprised to see the difference, the Pentium Ds were pretty much an atrocity as far as heat dissipation is concerned. :p

Yes, it's the E2180.

I was sure there was going to be a difference, but I didn't expect it to be so dramatic.

I wonder if the differences between 65W and 35W (like a Celeron 420) would be similar... I expect it wouldn't (diminishing returns), but I could be wrong...

[accord1999]

The 65W TDP is misleading, because it's used for virtually the entire Core 2-based family, up to the 3GHz E6850. The realworld power measurements place the E2100 series at <30W full-load.

[neon joe]

The 65W TDP is misleading, because it's used for virtually the entire Core 2-based family, up to the 3GHz E6850. The realworld power measurements place the E2100 series at <30W full-load.

I wasn't aware of that - know that, the results are making more sense.
Do the Celerons run much cooler than the Dual-Cores, or do they dissipate about the same amount of heat?

[accord1999]

I've only seen one review that has power measurements for the Celeron 400s:

http://www.matbe.com/articles/lire/385/ ... /page5.php

At idle, the lack of SpeedStep in the Celerons actually results in the Pentium E2100s using less power; the difference at full load is roughly ~10W-15W in favor of the Celerons.