Enzotech Ultra-X: If Looks Could Chill
by Wesley Fink on June 27, 2007 3:00 AM EST- Posted in
- Cases/Cooling/PSUs
Noise
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. Let's see how the Ultra-X compares with the other coolers we've tested in this area.
There are very few power supplies that do not have a fan. While Zalman and a few others do make expensive fanless power supplies, we have not seen a fanless unit larger than 500W, or one that would be used for seriously overclocking a system. With that in mind the noise level of the system with all fans turned off except the PSU was measured. The power supply used for the cooling test bed is the OCZ PowerStream 520, which is one of the quieter high performance power supplies.
We have also measured the Corsair 620W and Mushkin 650W power supplies which are reported to be quieter than the OCZ. Both the Corsair and Mushkin are indeed quieter at idle or start up speed. However, as soon as load testing begins and the PSU fan speed kicks up the measured noise level is almost exactly the same as the OCZ PowerStream 520W.
We are currently in the process of reevaluating our cooler test bed and planning some updates. The new configuration will include a "quieter" power supply with variable speed and noise levels. We will also update to a P35 chipset motherboard with all passive cooling to the chipset. Changes to the test bed will appear as part of a future roundup with the motherboard, PSU, and CPU all upgraded to more current configurations. We are also investigating a change to a quad-core processor as a further challenge to CPU cooling.
The noise level of the power supply is 38.3 dB from 24" (61cm) and 47 dB from 6" (152mm). The measured noise level of the test room is 36.4 dB, which is a relatively quiet room with a noise floor slightly below that of the OCZ PowerStream 520 PSU.
Noise levels were measured with the Enzotech Ultra-X fan at both low 1200 RPM speed and high 2500 RPM speeds. Both low and high measurements were taken at both the 6" and 24" distances above the cooling fan on an open case side. Results were then compared to the other coolers/fans tested in this category. Measured noise levels in this chart should be considered worst case. Measurements were taken with an open side of a mid tower case 6" and 24" from the HSF. Real world would be a completely closed case with a further reduction in noise. Please look for both low and high speed results in the noise graphs.
The measured noise levels at 6" and 24" do nothing to convince us that Delta fans are now quiet. When turned down to the lowest speed noise levels are below the noise floor, but air output is a fairly mediocre 35.8 CFM. Increasing fan speed to high raises CFM to a very respectable 83.7, but the price is noise levels that are clearly audible and among the poorest we have measured at 51.2 dB(A) at 24". There are other fans available that cool better at lower noise. Fortunately it is pretty easy to switch the stock fan for a quieter fan if that is your goal.
The Delta fan does provide a very wide range of cooling output, but there are better fans that provide higher output at lower noise at both the low and high output ranges. To our ears noise from the Delta fan was audible over much of the specified range. Overall noise results with the Delta fan are disappointing. There are many fans with similar output ranges - or even greater ranges - that are much quieter than the Delta used by Enzotech.
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. Let's see how the Ultra-X compares with the other coolers we've tested in this area.
There are very few power supplies that do not have a fan. While Zalman and a few others do make expensive fanless power supplies, we have not seen a fanless unit larger than 500W, or one that would be used for seriously overclocking a system. With that in mind the noise level of the system with all fans turned off except the PSU was measured. The power supply used for the cooling test bed is the OCZ PowerStream 520, which is one of the quieter high performance power supplies.
We have also measured the Corsair 620W and Mushkin 650W power supplies which are reported to be quieter than the OCZ. Both the Corsair and Mushkin are indeed quieter at idle or start up speed. However, as soon as load testing begins and the PSU fan speed kicks up the measured noise level is almost exactly the same as the OCZ PowerStream 520W.
We are currently in the process of reevaluating our cooler test bed and planning some updates. The new configuration will include a "quieter" power supply with variable speed and noise levels. We will also update to a P35 chipset motherboard with all passive cooling to the chipset. Changes to the test bed will appear as part of a future roundup with the motherboard, PSU, and CPU all upgraded to more current configurations. We are also investigating a change to a quad-core processor as a further challenge to CPU cooling.
The noise level of the power supply is 38.3 dB from 24" (61cm) and 47 dB from 6" (152mm). The measured noise level of the test room is 36.4 dB, which is a relatively quiet room with a noise floor slightly below that of the OCZ PowerStream 520 PSU.
Noise levels were measured with the Enzotech Ultra-X fan at both low 1200 RPM speed and high 2500 RPM speeds. Both low and high measurements were taken at both the 6" and 24" distances above the cooling fan on an open case side. Results were then compared to the other coolers/fans tested in this category. Measured noise levels in this chart should be considered worst case. Measurements were taken with an open side of a mid tower case 6" and 24" from the HSF. Real world would be a completely closed case with a further reduction in noise. Please look for both low and high speed results in the noise graphs.
The measured noise levels at 6" and 24" do nothing to convince us that Delta fans are now quiet. When turned down to the lowest speed noise levels are below the noise floor, but air output is a fairly mediocre 35.8 CFM. Increasing fan speed to high raises CFM to a very respectable 83.7, but the price is noise levels that are clearly audible and among the poorest we have measured at 51.2 dB(A) at 24". There are other fans available that cool better at lower noise. Fortunately it is pretty easy to switch the stock fan for a quieter fan if that is your goal.
The Delta fan does provide a very wide range of cooling output, but there are better fans that provide higher output at lower noise at both the low and high output ranges. To our ears noise from the Delta fan was audible over much of the specified range. Overall noise results with the Delta fan are disappointing. There are many fans with similar output ranges - or even greater ranges - that are much quieter than the Delta used by Enzotech.
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homonaut - Wednesday, June 27, 2007 - link
I was contemplating getting one of these after stumbling onto this 'review': http://www.coolaler.com/modules/news/article.php?s...">http://www.coolaler.com/modules/news/article.php?s... but now I don't know. How can the results be so different!?SilthDraeth - Wednesday, June 27, 2007 - link
Since I don't speak Chinese or Korean, etc, all I could do was look at the pictures. It is unclear what temps are load or not.Also, they use different processors. Anand uses a 6800 vs a 6600.
They both post a 43 degree celcius temp, on Anand thats a load temp at stock speed, so that might be load on the coolaler site. and the lower temps might be idel temps for the 6600.
idle temp might have been taken at a different time frame for how long the processor was running before the temperature was taken, etc.
The temps do not look to be a huge disparity though imo.
Wesley Fink - Wednesday, June 27, 2007 - link
The Enzotech could boot as high as 3.90 GHz, which is as good as any of the best coolers tested except the Ultra-120 eXtrme which reaches a stable 3.94GHz. All was fine at idle at 3.9GHz, but as soon as we began our stress testing with the game that is about 80% CPU load the system would fail with the Enzothec. This was with the fan on high, near 90 cfm at a pretty loud noise level. We could not even make it through one loop of the game demo, and our stress test procedure runs the game loop for 30 minutes to test load stability.We also tried adding a high output case can as some readers have suggested. This DID lower the CPU temperature, particularly at stock speed strangely enough, however it did not extend overclocking ability at all.