ZEROtherm Nirvana: Designed for Top Performance
by Wesley Fink on January 16, 2008 5:00 PM EST- Posted in
- Cases/Cooling/PSUs
Noise Levels
For many enthusiasts upgrading cooling the goal is maximum stable overclock, and they will live with the inconvenience of a louder system. For other users silence is the most important factor, and these users will forgo maximum overclocking if that increases system noise levels.
The specified 39 dB(A) seems realistic for a 120mm high-output fan, but ZEROtherm did not specify whether this noise measurement was at low speed or high speed. We expected the specification was low-speed noise, so the high-speed noise measurement was an unknown.
Test Results at stock speed with the Nirvana are spectacular, but you can see from the noise graphs that the performance comes with the trade-off of higher noise. You can clearly see the high noise levels at the high-speed setting in these graphs, and you can definitely hear the fan. However, the sound and frequencies are not high-pitched or whining and are generally easy to tolerate. Closing the case brings the noise levels down to near silence even at top fan speed. For most users with a closed case noise at top fan speed will not be a large issue unless they are sleeping next to the operating PC.
At low speed, the fan is essentially silent, but we found performance average at low speed with no real threat to the top performers. You can dial a nice balance in with the fan controller of the Nirvana, however. Performance at around 2000RPM is almost the equal of that measured with the fan on high, and competitive with the best coolers tested. Even better, noise levels at ~2000RPM are generally not audible in our test room and will be acceptable to most users.
Overclocks at 2000RPM do not reach as high, topping out at 3.87GHz. Most will find this compromise of performance versus noise very acceptable, and this is still one of the best coolers we have tested no matter how you measure the performance and noise.
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Spanki - Thursday, January 17, 2008 - link
Nice review.Was the Thermalright Ultra 120 Extreme's top overclock (3.94GHz) achieved with one SFlex SFF21F fan? Or two? On a retail cooler? Or a lapped and/or mount-modded one? It would help if you listed the fan(s) used in all tests/charts. Is it safe to assume one fan, unless you specifically state otherwise?
Aside from that, I agree with an earlier poster - a rise-over-meaured-ambient at the time of test would be a much better indicater when we're talking about 1-3C differences in coolers these days.
Amuro - Wednesday, January 16, 2008 - link
Are you sure those are Core Temp readings? They look like Tcase temps to me. I mean the stock Intel cooler idle @ 31C? That's incredible.I compared them to these articles of yours from a year ago, where you used Nvidia Monitor to messure the Tcase temps:
http://www.anandtech.com/showdoc.aspx?i=2937&p...">http://www.anandtech.com/showdoc.aspx?i=2937&p...
http://www.anandtech.com/showdoc.aspx?i=2943&p...">http://www.anandtech.com/showdoc.aspx?i=2943&p...
Wesley Fink - Thursday, January 17, 2008 - link
Those are the CoreTemp readings, which provide a temp reading for each core of the X6800. The results are very consistnet and repeatable across our tests, but they can NOT be compared to earlier nVidia utility readings. The CoreTemp readings are much lower than the nVidia readings, but they are consistent acrss test platforms.Amuro - Thursday, January 17, 2008 - link
That is weird. Core temps (Tjunction) are supposed to be higher than BIOS temps (Tcase). The difference between Tcase and Tjunction should be 15C or +- 3 degress for a C2D dual core, or 10C for a quad core.Amuro - Thursday, January 17, 2008 - link
That is weird. Core temps (Tjunction) temps are supposed to be higher than BIOS temps (Tcase). The difference between Tcase and Tjunction should be 15C or +- 3 degress with C2D dual cores, or 10C for a quad core.Amuro - Thursday, January 17, 2008 - link
That is weird. Core temps (Tjunction) temps are supposed to be higher than BIOS temps (Tcase). The difference between Tcase and Tjunction should be 15C or +- 3 degress with C2D dual cores, or 10C for a quad core.Amuro - Thursday, January 17, 2008 - link
That is weird. Core temps (Tjunction) temps are supposed to be higher than BIOS temps (Tcase). The difference between Tcase and Tjunction should be 15C or +- 3 degress with C2D dual cores, or 10C for a quad core.coolingwine - Wednesday, January 16, 2008 - link
Wesley - always like your analysis.But, what would be really useful is a performance (temp) to noise ratio chart. And make this standard in future analyses.
As you know, there is typically trade-off between temp and noise, much like price/performance. I may be willing to give a little on the OC potential (which is a factor of temp, all things except the HSF being equal) if the noise is less.
Just a thought....
soydeedo - Sunday, January 20, 2008 - link
I second this idea. I find myself swapping between the noise/temp pages constantly to get a better overall picture of cooling performance.PolymerTim - Wednesday, January 16, 2008 - link
Thanks for the great review. I really like how these reviews examine a large variety of coolers from different perspectives (idle/load, with/without OC, noise, etc). I was thinking a bit about the data and had a couple of thoughts/suggestions.I see in your test configuration that ambient temperature is maintained between 20-22 C. It seems to me that a 2 degree range can be important in some of the tests such as idle tests. At stock idle, half of the coolers fall into a 2 C range. I wonder if it is possible to record the actual ambient temperature during testing and then plot increase from ambient for each cooler. I think this could give a little more accuracy to the comparisons.
A minor detail along the same lines; I think it is unnecessary to start the scaling graphs at 0 C. I think a lot of blank space could be saved by starting at 20 C. What do you guys think? Also, maybe this is data overkill, but I would be curious to know the temperature of each cooler at the max stable OC.
-Tim