Ok, after a quick test with the meter I think I can put the horse back in the stable: The radiator fan IS Dynamic.....It's just a LOUD fan 
 
Voltages on the fan header ranged from 8.2v@25˚ to 11.7v@55˚. So it would seem EVGA's advertising is correct, as is some of their techs
 
 
Hope that helps.
 
 
Next Job: Replace the fan and run it off the motherboard...me needs silence
 
 
 

Puddles.Next Job: Replace the fan and run it off the motherboard...me needs silence

That will help for sure! I used Speedfan and 2xNoctua NF-F12 on the rad. Fan speed was controlled with Speedfan based on the GPU temperature.

Puddles.
So *scratchhead* just to clarify, the Radiator Fan is meant to be dynamic and not run at a constant speed?  
 
I've owned this card since December and the Rad fan has been the loudest fan in my case since day one, annoyingly so, but just accepted that this is the norm for the Hybrid. 

are you 100% sure its not the blower fan you are hearing. set the blower fan speed to like 20-30% fixed and see if the noise is any better.
 
with my 980ti hybrid SLI setup i noticed the back of my cards, the tubes, the radiator and reservoir were getting extremely hot to the touch, especially the top card (along with the radiators fan noise). it made me think the rad fans weren't doing a good enough job. i dont think they were fast/powerful enough.
 
i know its not the answer or solution you want to hear but...
 
i changed them with noctua fans. i used a fan header adapter to use them with the cards fan port. this did fix the noise issue, but they still seemed very under powered. one of them wouldn't even spin at times. maybe the stock fans are made to run at lower voltages?
 
so i connected them to a single motherboard header (using a splitter) and control them with fan expert 3 (asus fan controller software). they are now way more quite then stock fans. and the heat issue is much better as well. i still think my 295x2 ran cooler even though it was a dual gpu setup using a single 120mm rad (vs each of my 980ti's having their own 120mm rad). but its not as bad as before.

cmoney408
 
 
are you 100% sure its not the blower fan you are hearing. 

Yup, I'm 100% sure it's not the hamster wheel fan. 

Sorry for bringing this thread back, does anyone know if the rad fan is still dynamic if you replace it with a 4 pin fan and plug it right in where the stock fan plugs in to the GPU?

I want to replace the stock fan with a different fan (Corsair ML140) but from what I've been reading I kind of get the impression that only the stock fan will be dynamic and that any 4 pin fan I might plug in will just run at 100%, is this true?

RipGroove
Sorry for bringing this thread back, does anyone know if the rad fan is still dynamic if you replace it with a 4 pin fan and plug it right in where the stock fan plugs in to the GPU?

I want to replace the stock fan with a different fan (Corsair ML140) but from what I've been reading I kind of get the impression that only the stock fan will be dynamic and that any 4 pin fan I might plug in will just run at 100%, is this true?

Somebody tested the output of the +12v (2 pins) output of the header and it drops as low as (8.2v) or lower depending on either load or temp (not sure which). It uses variable voltage to control the fan.

So you have to make sure the fan you are replacing it with won't shut off below a certain voltage. Noctua fans are capable of running as low as 7v (except their industrial ppc fans) so check with the fan manufacturer.

timmyboy04

RipGroove
Sorry for bringing this thread back, does anyone know if the rad fan is still dynamic if you replace it with a 4 pin fan and plug it right in where the stock fan plugs in to the GPU?

I want to replace the stock fan with a different fan (Corsair ML140) but from what I've been reading I kind of get the impression that only the stock fan will be dynamic and that any 4 pin fan I might plug in will just run at 100%, is this true?

Somebody tested the output of the +12v (2 pins) output of the header and it drops as low as (8.2v) or lower depending on either load or temp (not sure which). It uses variable voltage to control the fan.

So you have to make sure the fan you are replacing it with won't shut off below a certain voltage. Noctua fans are capable of running as low as 7v (except their industrial ppc fans) so check with the fan manufacturer.

Nice info thanks. Turns out my motherboard actually reads GPU temp through the PCIE slot so I can actually use any fan I want on my GPU and just connect it to my motherboard and set the temp source to GPU.

RipGroove

timmyboy04

RipGroove
Sorry for bringing this thread back, does anyone know if the rad fan is still dynamic if you replace it with a 4 pin fan and plug it right in where the stock fan plugs in to the GPU?

I want to replace the stock fan with a different fan (Corsair ML140) but from what I've been reading I kind of get the impression that only the stock fan will be dynamic and that any 4 pin fan I might plug in will just run at 100%, is this true?

Somebody tested the output of the +12v (2 pins) output of the header and it drops as low as (8.2v) or lower depending on either load or temp (not sure which). It uses variable voltage to control the fan.

So you have to make sure the fan you are replacing it with won't shut off below a certain voltage. Noctua fans are capable of running as low as 7v (except their industrial ppc fans) so check with the fan manufacturer.

Nice info thanks. Turns out my motherboard actually reads GPU temp through the PCIE slot so I can actually use any fan I want on my GPU and just connect it to my motherboard and set the temp source to GPU.

No prob.
Um, I could be mistaken but I think it reads your PCIE *ZONE* which means there is a thermal sensor on the board near your PCIE slot on your MOBO. I don't think your card physically *handshakes* with your motherboard software and reports GPU temp. I could be wrong but that's how it is on mine (Asus). If that's the case, your card might hit some pretty high temps before your fan ramps up, possibly catastrophic. 
 
Although, if that IS really how it works that is pretty cool and I've never heard of that. That was what the original OP could have done to avoid all of his issues and probably saved him a ton of headache lol. Care to contact MSI and report back?

timmyboy04

RipGroove

timmyboy04

RipGroove
Sorry for bringing this thread back, does anyone know if the rad fan is still dynamic if you replace it with a 4 pin fan and plug it right in where the stock fan plugs in to the GPU?

I want to replace the stock fan with a different fan (Corsair ML140) but from what I've been reading I kind of get the impression that only the stock fan will be dynamic and that any 4 pin fan I might plug in will just run at 100%, is this true?

Somebody tested the output of the +12v (2 pins) output of the header and it drops as low as (8.2v) or lower depending on either load or temp (not sure which). It uses variable voltage to control the fan.

So you have to make sure the fan you are replacing it with won't shut off below a certain voltage. Noctua fans are capable of running as low as 7v (except their industrial ppc fans) so check with the fan manufacturer.

Nice info thanks. Turns out my motherboard actually reads GPU temp through the PCIE slot so I can actually use any fan I want on my GPU and just connect it to my motherboard and set the temp source to GPU.

No prob.
Um, I could be mistaken but I think it reads your PCIE *ZONE* which means there is a thermal sensor on the board near your PCIE slot on your MOBO. I don't think your card physically *handshakes* with your motherboard software and reports GPU temp. I could be wrong but that's how it is on mine (Asus). If that's the case, your card might hit some pretty high temps before your fan ramps up, possibly catastrophic. 
 
Although, if that IS really how it works that is pretty cool and I've never heard of that. That was what the original OP could have done to avoid all of his issues and probably saved him a ton of headache lol. Care to contact MSI and report back?

You may be right, I'll contact ASUS and find out. My board is an ASUS Z270 TUF Mark 1

timmyboy04

RipGroove

timmyboy04

RipGroove
Sorry for bringing this thread back, does anyone know if the rad fan is still dynamic if you replace it with a 4 pin fan and plug it right in where the stock fan plugs in to the GPU?

I want to replace the stock fan with a different fan (Corsair ML140) but from what I've been reading I kind of get the impression that only the stock fan will be dynamic and that any 4 pin fan I might plug in will just run at 100%, is this true?

Somebody tested the output of the +12v (2 pins) output of the header and it drops as low as (8.2v) or lower depending on either load or temp (not sure which). It uses variable voltage to control the fan.

So you have to make sure the fan you are replacing it with won't shut off below a certain voltage. Noctua fans are capable of running as low as 7v (except their industrial ppc fans) so check with the fan manufacturer.

Nice info thanks. Turns out my motherboard actually reads GPU temp through the PCIE slot so I can actually use any fan I want on my GPU and just connect it to my motherboard and set the temp source to GPU.

No prob.
Um, I could be mistaken but I think it reads your PCIE *ZONE* which means there is a thermal sensor on the board near your PCIE slot on your MOBO. I don't think your card physically *handshakes* with your motherboard software and reports GPU temp. I could be wrong but that's how it is on mine (Asus). If that's the case, your card might hit some pretty high temps before your fan ramps up, possibly catastrophic. 
 
Although, if that IS really how it works that is pretty cool and I've never heard of that. That was what the original OP could have done to avoid all of his issues and probably saved him a ton of headache lol. Care to contact MSI and report back?

This is the reply i got from ASUS, not sure if its correct as it seems like he's dumbing things down for me as if I don't know how a PC works and starting going on as if I have overheating problems, which I don't and didn't mention at all in my email to them?!
 
 
Thank you for contacting Asus, my name is Matthew and I will try my best to assist you with your situation.
Please feel free to rate our service according to the solution provided in the questionnaire that will be sent to you shortly after our reply to  your inquiry.
I am sorry to hear that you are facing issues with your TUF Z270 MARK 1 motherboard.
Based on the provided information I understand that yu want to know where the graphics card temperature is collected from. The graphics card shoukd have a sensor that transmits the temperature to the motherboard.

If you are having overheating issues, I recommend you do a CMOS reset of the BIOS by by taking out the battery for 3-5 minutes while the PSU is unplugged. While the power cord from the PSU is still unplugged, press the power button down for 30 seconds to power discharge the unit. Then place the CMOS battery back in, plug in the PSU and try again.

After this test the motherboard in minimal configuration, outside the case and check if the issue persists.
Should you have any further questions, please do not hesitate to get back in touch with us.

Best Regards,
Matthew
ASUS Technical Support
http://support.asus.com/