Originally Posted by Jodiuh
Sure. I should have probably given the caveat that I'm a total noise snob. My previous card, a Galaxy GTX 580 had 3 fans that spun slower and a much larger heatsink. It was below the noise floor of my case fans. The ACX goes way, way past that. Also, my temps would routinely hit 77, sometimes 80C w/ stock clocks and volts. The Galaxy kept the 580 to 65C. So the difference between the two was quite large.
Asus DC2 goes for the same $, cools MUCH better, and makes MUCH less noise.
I'm not complaining. I'm EXPLAINING just how BADLY the card's cooler is compared to others.
X-Bit had this to say about the EVGA ACX cooler...
"As for the EVGA card, it is, unfortunately, rather loud according to our measurements...The only downside we can see about it is its rather noisy cooler."
And Hardware Canucks had this to say about the Asus DC2 cooler...
"One of the main reasons behind such an impressive showing in the overclocking category is the spectacular heatsink design. It allowed the core to remain blissfully cool, effectively reducing power consumption and ensuring the card doesn’t run headfirst into NVIDIA’s Power Limit roadblock. The Temperature Limit is also deftly avoided leading to voltage being the only thing holding the GTX 780 DirectCU II back from smashing through even more barriers.
So this leads us to our final question: is ASUS’ latest engineering marvel worth its premium over a reference card? Absolutely. Whether or not you want to access the DirectCU II OC’s significant overclocking powers or you are just someone that appreciates a whisper-quiet high end card, it should beckon. This GTX 780’s relatively low pre-overclock speeds are rendered insignificant by its other overwhelming benefits."
So for the same amount of money, you have a card that's cooler, quieter, and uses less power. Have you heard the thing @ full tilt? Vrrrrrooooo....vrooooo...vroooo...it sounds like the fan is constantly revving up and down. GOOD is not a word I would use to describe that monstrosity.
edit: And if you STILL need a reason why the DC2 is better than the ACX, it's $50 cheaper.
like i was saying all you prove here is the the DirectCU II cooler is better
that doesn't meen the ACX is crap
Finally let’s take a look at noise. The GTX 780’s reference cooler was in part tuned for very good idle noise levels, so it’s not something that’s easily surpassed. In this case the 780SC ACX ends up being just over 1dB louder, an unsurprising outcome given the competition and the fact that twin fan open air coolers as a whole typically fall into this scenario.
Meanwhile load noise looks quite good. Based on our data it looks like EVGA has tuned the 780SC ACX to slightly favor temperatures over noise, but even so they’re still easily beating the reference GTX 780. This ends up being a 1.5dB advantage under BF3, while the more punishing (and ultimately worst case scenario) FurMark sees the card beat the reference GTX 780 by just under 6dB. Or compared to Titan the advantages are even greater, with a 4.4dB advantage to the 780SC under BF3 and a similar advantage under FurMark. In the end, unlike the 780/Titan reference cooler, the ACX cooler doesn’t need to significantly increase its fan speeds to handle the extra load presented by FurMark, which is why we see noise levels almost identical between that and BF3.
Ultimately EVGA’s ACX cooler performs very well under load, which is no less than what we’d expect given the design and EVGA’s expertise in the matter. Like other open air coolers, the ACX cooler provides lower temperatures and lower noise levels than the equivalent reference blower, delivering Titan-like performance for under 47dB. Of course it goes without saying that this is a tradeoff; an open air cooler pushes more of the cooling load onto the chassis itself, so while the ACX cooler is highly effective in a large, airy case like our Spedo, it’s generally not the best choice for small and/or low airflow scenarios, those scenarios being where the reference blower best excels.
Cooling & Noise Levels
The NVIDIA reference coolers are great, but they follow the temperature target of 80 degrees C. With the ACX cooler the GPU will get 450W of cooling power thrown at it. As a result the temperature target might remain at roughly 65 degrees C, we have never seen the card pass 63 Degrees though. An added benefit of that is that the dynamic clock frequency will go higher up to the point it reached its power target. So this is why the card is so close and sometimes a small notch faster then the GTX Titan.
And if you wonder about noise ... it's so little that I do not even want to mention is. So you are good there
For all temperature testing, the cards were placed on an open test bench with a single 120mm 1200RPM fan placed ~8” away from the heatsink. The ambient temperature was kept at a constant 22°C (+/- 0.5°C). If the ambient temperatures rose above 23°C at any time throughout the test, all benchmarking was stopped..
For Idle tests, we let the system idle at the Windows 7 desktop for 15 minutes and recorded the peak temperature.
In order to hit its high Boost clocks, the ACX SC needed to keep the GK110 core as cool as possible and it does just that. It actually manages to beat out Gigabyte’s well-regarded WindForce heatsink in this key metric.
What you see below are the baseline idle dB(A) results attained for a relatively quiet open-case system (specs are in the Methodology section) sans GPU along with the attained results for each individual card in idle and load scenarios. The meter we use has been calibrated and is placed at seated ear-level exactly 12” away from the GPU’s fan. For the load scenarios, a loop of Unigine Valley is used in order to generate a constant load on the GPU(s) over the course of 15 minutes.
On paper, the GTX 780 ACX may seem louder than the Gigabyte WindForce OC but truth be told, it’s almost impossible for the human ear to distinguish one from the other. Remember, we’re talking about readings in the sub-50 decibel range which is as quiet as most fans get. With that in mind, these are some impressive results for EVGA’s first in-house designed heatsink.