Question on Zalman CNPS7000B-Cu

[Wisey]

I installed this today...question is why are the temperatures still the same?

When I was using Intel original heatsink/fan, my northwood 2.6 Ghz was at 31 to 33C idle and 48 C full load.

With this new heatsink/fan, it is the same temperatures at idle and loaded.

Is this normal or did the shop install wrongly?

Or may be it's because of the new PSU? I replace the existing 350W Antec with a 420W OCZ PSU and the 12V, 5V and 3.3V are higher across the board.

 

[CraigRT]

Well, could be a bunch of things

Could be a generously low readout of temps to begin with.
could be the fact that the Zalman is not meant for major temp decreases, but rather major noise decreases. if my temps stayed the same with it, i'd be happy enough. a drop would be a benefit.
and yes it could be your voltages IF the CPU core voltage is higher than it was before.

either way, i'd be happy with those temps.

 

[Wisey]

Hi CraigRT,

If it is about simply noise reduction, then I would regret spending the money...sigh...

Any Zalman CNPS7000B-Cu users out there care to share your experience?

Would be grateful.

 

[V00D00]

I'm getting a zalman 7700 so mine is quieter. I don't expect temps to decrease, they will probably go up.

 

[Wisey]

It is really quiet to be honest.

Even with my PC's side panel open, I cannot hear the CPU fan. My Zalman fan is set to maximum 2500 RPM.

At full load, I did notice temperature to be lower by 2 to 3C which is not bad.

 

[Algere]

If your ambient temp is high, that could also explain why you're not seeing major temp differences between stock & Zalman. Even the best of air coolers won't perform at its fullest if you have hot air sucking from or blowing down on the heatsink.

 

[Tweakin]

I have a cu7000 that I'm getting ready to put up for sale. Yes it was quiet, but it is not up to the job of dropping the temps by any worthy value. I also had a problem with it blowing the hot air across my older motherboard.

I also don't like that way it sits on a S939 chip...the chip is just slightly larger then the base of the cooler. Just my opinion.

 

[wisdomtooth]

I have Zalman CNPS7000AlCus installed on several computers where I work. They DO do a better job of cooling than the stock Intel fansinks, if you apply it with some Arctic Silver 5 rather than that paste included with the heatsink.

Also, as mentioned before you need good case ventilation for ANY heatsink to work effectively. I find that the Zalman 7000 works best in a case that has a nice exhaust fan right behind the CPU and a good PSU with a 120mm exhaust fan (rather than the usual 80mm PSU fan).

The computers at work have Pentium-4 Northwoods 3.0gHz, Seasonic Super Tornado PSUs with 120mm fan, and two 60mm rear exhaust fans. Case temp 31C in 25C ambient room temp, CPU temp never rises above 47C under load. And best of all, they are QUIET!