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  1. #1
    ROG Guru: Green Belt Array Henkenator68NL PC Specs
    Henkenator68NL PC Specs
    MotherboardRampage V Extreme
    ProcessorIntel Core i7 5960X
    Memory (part number)G.Skill Ripjaws V
    Graphics Card #1R9-290X
    Graphics Card #2R9-290X Matrix Platinum
    Graphics Card #3HD 6970
    Graphics Card #4HD 5970
    MonitorAcer Predator XB720H 144herz 1ms
    Storage #1Samsung EVO 850 1TB
    Storage #2Seagate 2TB
    CPU CoolerCustom Watercooled loop
    CaseCooler Master HAFX and Storm Stryker
    Power SupplySeasonic Gold 1250W
    Keyboard Logitech G19
    Mouse RAT 7
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    Henkenator68NL's Avatar
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    Fan Xpert 2: What can it do for you?

    Fan Xpert2: What can it do for you? Setting up fans, control your fans.


    Asus Fan Xpert 2: A nice solution to control your Fans by using the Fan Xpert 2 Software, so it seems.
    I have put it to the test. For the record: I do know there are separate fan controllers –and I use them to. However I always try to figure out the benefits of the options that are offered, like in Fan Xpert 2. I have worked with the previous versions as well. I also know about the stories that the 4-pins power fan headers on the Asus ROG boards are not using the power control function as they are developed by the industry. I believe that the Fan Xpert 2 controls the fan speeds by simply dropping the voltages that are directed to the fans (but correct me if I am wrong). Also, I am not going to explain how Fan Xpert 2 works here.

    After having made those remarks, I do think Fan Xpert 2 has some real benefits.
    For a product feature that is being advertised as one of its features for the Maximus and other Republic of Gamers series motherboards, the lack of complete and sufficient information is surprising.

    If you are a buyer of one off these ROG products, you at least qualify as an PC enthusiast, right? So it should be possible to connect a cooling solution that goes far beyond 1 CPU fan, 1 Front Case Fan and 1 Back Case Fan.


    The Cooling Solution I use is setup like this:
    Click image for larger version. 

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    So the things that I was interested in – when setting up my build- where:
    • How many fans can I connect to each fan header? Why? Because most of the time those fan headers have a maximum power output; i.e. what is the maximum Wattage per connector.
    • Which fan headers are actually controlled by Fan Xpert 2?
    • Where do I put the RPM signal of my Water Cooling pump(s).
    The manual has poor information on this subject:
    1. It states that the CPU_FAN connector supports the maximum of 1 Ampere fan power.
    2. The CPU_FAN and the CHA_FAN connectors support the FAN Xpert 2 feature.
    According to an answer in another thread about the power, all fan headers are 1A. The formula for Watt = Volt x Ampere. So PSU supplies 12 Volt, therefor the total wattage per header is 12 Watt. I checked how much Watt the Fans are drawing, this can be found in the manufacturers specifications.


    So it seems that 4 Fan headers can be controlled by the Fan Xpert 2 software, but this is not really true because the FANS connected to the CPU_OPT fan are “ mirrored” from the CPU_FAN header. So In fact we have 5 headers that can be used to connect FAN(s) groups to, that can be controlled by Fan Xpert 2
    [IMG]file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.jpg[/IMG]





    It would be useful to have the same fans, that are on the same location, to be connected to 1 fan header. So I will use y-splitters to connect more than 1 fan to each fan header. I get the following groups:
    Click image for larger version. 

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    But what if I would like the software also to control the RPM from my Water cooling pump? This depends on the total amounts of Watts from the Pump. I decided not to connect the pump to the motherboard, because I use a separate-external controller/thermal sensor for the pump. I do this because the controller has a very loud speaker that signals if the pump should fail. Also I decided to connect the Front intake fan (group F) to the OPT_FAN1 the reason is that this Fan cannot slow down by decreasing its Volts (it stops running immediately). So it would not take any controllable Fan Header I switched it to the optional fans.


    On the Maximus VI Extreme the following fan headers are available:
    Click image for larger version. 

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    The total amount of wattage of the fan groups that I want to connect to each header does not exceed the 12 watts, so no problems there.


    So I dug up the technical details for each fan:
    Click image for larger version. 

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    I checked the minimum and maximum RPMs for each fan, as found in the specs, as stated by the BIOS (with no active BIOS fan profiles, so all at 100%) and as found by Fan XPERT 2.

    Strange thing is going on when you look close at the stated RPM of fan group F1 and F2: both groups have the same fans: Noctua NF-F12 PWM fans that both are mounted as “pull” fans on a 360x120mm radiator (I use 2 of them). I connected group F1 to the CPU_FAN header and the BIOS and Fan Xpert 2 give a maximum speed of 1200 RPM, but they are rated for 1500 RPM! I connected fan group F2 to the CPU_OPT fan header (again the same Noctua fans are used), the BIOS gives a maximum speed of 1400 RPM and FAN Xpert 2 gives only 1200 RPM. If I switch FAN Xpert 2 to Full Speed …. The RPMs of the Noctua Fans on CPU_OPT read: 1425 RPM !! That’s strange.


    Here you can see the maximum RPM stated by Fan Xpert 2

    Click image for larger version. 

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    The CPU_FAN reads 1197 rpm and the CPU_OPT reads 1425 rpm, even though they are the exact same fans, the get different maximum speeds. I don’t know why and I am not going into discussions about that, I simply observe, make a note and get on with it.


    After running the Fan Xpert 2 fan tuning program I get the following 4 Fan Profiles:


    For fan group F1 and (since the CPU_OPT header is linked to this) also group F2
    Click image for larger version. 

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    For fan group F3:
    Click image for larger version. 

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    For Group F4:
    Click image for larger version. 

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    For Group F5:
    Click image for larger version. 

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    These are the fan speeds after tuning them, with the system pretty much Idling:

    Click image for larger version. 

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    The difference is huge, not just in RPM but much more in the noise!!

    I do not own the correct official equipment for measuring sound. I did use an app on my smartphone, that –as they state- should give some indication to the sound level.

    The Sound level in my room (yes I live in a very small an quite town) with my PC turned off, no other machines running, no people etc. Just to establish a baseline is: 23 dB


    Now the sound level with the PC switched on, everything (except the external radiator+5 fans) is enclosed in the case, like any normal user out there.

    Click image for larger version. 

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    So with the tuning that Fan Xpert 2 did, the system produces 46 dB and when stressed maximum of 48 dB.


    All tests are run with: Maximus VI Extreme, Core i7 4770K, Sapphire 7970, 8 GB Corsair Platinum, 2 x Intel 520 SSD in RAID0 (YES finally supporting TRIM). All mounted in a custom modded HAF X case, with complete high end custom water cool loop. For the test I have used these settings:
    CPU overclocked@4400MHz, Dram overclocked to 2400MHz, GPU running in Oc mode 1050/1500 MHz. The CPU and GPU are watercooled! The influence off the tuning –and down scaling of the fan speed – by Fan Xpert 2 on the temperatures in the different parts of my PC will be shown a bit further down.


    Now Let’s see what the sound level is when all fans run at 100% speed. It averages around 59 dB!

    Click image for larger version. 

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    So the difference of running all fans on top speed or tuned by Fan Xpert 2 is 11 to 13 decibel.
    For comparison: an normal conversation at a distance of 1 meter is something like 70 dB of sound, the sound of a bussy street is about 80dB. That is around the same difference in noise level!


    To see what the temperatures do when the fans are either tuned by Fan Xpert 2 or running at full speed (100%), a ran a number of tests:
    1. System Idle
    2. Playing a round off Battlefield 4 Multi play for at least 30 minutes
    3. Run AIDA64 system stability test for at least 30 minutes
    4. Run 3DMARK Firestrike Extreme in Timed loop
    5. Run 3DMARK Vantage, performance level, 3 loops
    The results are shown in this graph:
    Click image for larger version. 

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    This shows that the temperatures of the CPU, GPU and the motherboard are slightly lower when all fans run at full speed. In my opinion the difference is so small, that it justifies using the fan profiles created by Fan Xpert 2.

    The final cooling setup that I ended up with looks like this:
    Click image for larger version. 

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    Conclusion: Fan Xpert 2 is a good tuning tool for your fans, although it doesn’t seem to take full advantage off the possibilities of true 4-pins fan controller. You can easily setup your system and have the software control a large amount of fans. In my situation it controls a total of 11 Fans! The total noise level drops significantly, the negative effect on the temperatures is only a small (varying from 1 to 5 degrees Celsius).


    I thought this is reason enough to share with you all!
    Miniatura de Adjuntos Miniatura de Adjuntos Henkenator68NL_FX2_pic11.png  


  2. #2
    ROG Guru: Blue Belt Array twisted1's Avatar
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    Nice guide Henk!

    When using PWM fans you can also use a PWM splitter cable that draws power from a molex.

    Click image for larger version. 

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  3. #3
    ROG Guru: Green Belt Array Henkenator68NL PC Specs
    Henkenator68NL PC Specs
    MotherboardRampage V Extreme
    ProcessorIntel Core i7 5960X
    Memory (part number)G.Skill Ripjaws V
    Graphics Card #1R9-290X
    Graphics Card #2R9-290X Matrix Platinum
    Graphics Card #3HD 6970
    Graphics Card #4HD 5970
    MonitorAcer Predator XB720H 144herz 1ms
    Storage #1Samsung EVO 850 1TB
    Storage #2Seagate 2TB
    CPU CoolerCustom Watercooled loop
    CaseCooler Master HAFX and Storm Stryker
    Power SupplySeasonic Gold 1250W
    Keyboard Logitech G19
    Mouse RAT 7
    Headset Logitech G35
    Mouse Pad Steel series
    Headset/Speakers Logitech X 5.1 Surround
    OS Windows 10 Pro 64bit
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    Thanks, now I thought I must have had all kinds of connectors /splitters in my hands, but this one is new to me. Thanks for the tip. Ps to get the picture right, that cable, it takes power from the molex, the signal cable is connected to a 4 pins connector that is going to be connected to a fan header?

  4. #4
    ROG 師傅 Array Arne Saknussemm PC Specs
    Arne Saknussemm PC Specs
    Laptop (Model)Laptop?...No way! (Model?...Jun Amaki...yes way!)
    MotherboardROG ZENITH EXTREME
    ProcessorTHREADRIPPER 1920X
    Memory (part number)F4-3200C14Q-32GVK
    Graphics Card #1GTX Titan X
    Graphics Card #2SLI is dead to me
    Graphics Card #3Tri SLI is even dead to Nvidia
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    Sound CardXonar Essence STX
    MonitorASUS ROG Swift PG279Q
    Storage #1Samsung 950 PRO
    Storage #22x OCZ VERTEX 3/2x WD Caviar Black 500GB / 2x WD RED 2TB
    CPU CoolerCustom Loop: Dual D5s, Dual Alphacool Monsta 480s, XSPC Raystorm Neo TR4, EK TitanX WaterBlock
    CaseNope!...Phobya Bench...let it all hang out man!
    Power SupplySeasonic SS-1200XP3
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    Henk! FANtastic!

  5. #5
    ROG Guru: Green Belt Array Henkenator68NL PC Specs
    Henkenator68NL PC Specs
    MotherboardRampage V Extreme
    ProcessorIntel Core i7 5960X
    Memory (part number)G.Skill Ripjaws V
    Graphics Card #1R9-290X
    Graphics Card #2R9-290X Matrix Platinum
    Graphics Card #3HD 6970
    Graphics Card #4HD 5970
    MonitorAcer Predator XB720H 144herz 1ms
    Storage #1Samsung EVO 850 1TB
    Storage #2Seagate 2TB
    CPU CoolerCustom Watercooled loop
    CaseCooler Master HAFX and Storm Stryker
    Power SupplySeasonic Gold 1250W
    Keyboard Logitech G19
    Mouse RAT 7
    Headset Logitech G35
    Mouse Pad Steel series
    Headset/Speakers Logitech X 5.1 Surround
    OS Windows 10 Pro 64bit
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    Hahahhaahha Arne you blow me away

  6. #6
    ROG Guru: Brown Belt Array nikosa43's Avatar
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    Grats Henk! You 've made a hell of a job and you presented it with the best way for everyone to understand. In addition for the four pin PWM fans, the logic behind this, is similar of how mosfets produce Voltage for CPU or memory. Instead of having a circuit to increase or decrease voltage, you have constant power of, let's say 12 Volts, and with the fourth pin you control the duty cycle of this. In other words the circuit switches on for some time, switches off some time and so on. Now, the duration of ON and OFFs and the frequency the circuit uses for this determines the speed of the rotation of the fan. Of course you need PWM capable fans (which they include a special circuit inside) and a compatible circuit from the mainboard's side to have them both work correctly. During 100% of duty cycle the fan rotates close to the maximum of fan's specs but that depends on both circuits compatibility. When you disable monitoring through BIOS and you set everything to max your fans hit the highest rpm. I presume, to that stage, the circuit bypass the pulse modulation driver and just apply full 12Volts + for max speed.

  7. #7
    ROG Guru: Green Belt Array Henkenator68NL PC Specs
    Henkenator68NL PC Specs
    MotherboardRampage V Extreme
    ProcessorIntel Core i7 5960X
    Memory (part number)G.Skill Ripjaws V
    Graphics Card #1R9-290X
    Graphics Card #2R9-290X Matrix Platinum
    Graphics Card #3HD 6970
    Graphics Card #4HD 5970
    MonitorAcer Predator XB720H 144herz 1ms
    Storage #1Samsung EVO 850 1TB
    Storage #2Seagate 2TB
    CPU CoolerCustom Watercooled loop
    CaseCooler Master HAFX and Storm Stryker
    Power SupplySeasonic Gold 1250W
    Keyboard Logitech G19
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    Niko, That is very good information, this clarifies a lot of the remaining questions I still had. I think that looking back to this testing I did, it is interesting to see the effects of Fans, fans speeds, fan positioning, liquid temperatures, liquid flow rates etc on the Benchmarks when runnig for max scores @ max frequencies. Well I will add that to my to do list!

  8. #8
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    I think I wish Fan Xpert II have is the ability to adjust fan speed based on GPU temp instead of CPU temp. I get that CPU temp should be the main measurement in regards to CPU heatsink fans but in my case with the toasty R9 290, I really wish I can change two of the fan used on the aftermarket VGA cooler to change speed based on a GPU temp since some games will only bring temp of CPU up to mid 40s in my rig while GPU is running at 80+

  9. #9
    ROG Guru: Blue Belt Array twisted1's Avatar
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    Quote Originally Posted by Henkenator68NL View Post
    Thanks, now I thought I must have had all kinds of connectors /splitters in my hands, but this one is new to me. Thanks for the tip. Ps to get the picture right, that cable, it takes power from the molex, the signal cable is connected to a 4 pins connector that is going to be connected to a fan header?
    Exactly! I have one myself and it works great. If you connect a 3pin non-pwm it will just run on full speed though. So only PWM, all we need now is Schyte GentleTyphoons in a PWM version

  10. #10
    ROG Guru: Blue Belt Array twisted1's Avatar
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    Quote Originally Posted by Scblacksunshine View Post
    I think I wish Fan Xpert II have is the ability to adjust fan speed based on GPU temp instead of CPU temp. I get that CPU temp should be the main measurement in regards to CPU heatsink fans but in my case with the toasty R9 290, I really wish I can change two of the fan used on the aftermarket VGA cooler to change speed based on a GPU temp since some games will only bring temp of CPU up to mid 40s in my rig while GPU is running at 80+
    You can always connect a temp probe to the mobo-pins next to the OPT fans. And just connect the temp probe to the gpu. And done

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