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4790k chirping and some temperature questions

post #1 of 11
Thread Starter 
Hi,

my system specs are:
Asus z97i-plus mobo
i7-4790k
Corsair A380t case
Corsair 650W modular PSU
16G corsair DDR3 ram (2x8)
Deepcool Gammaxx 300 cooler (largest tower cooler I could find that fits the case)

My problem is that it's chirping under load (coil whine-like mixed with hdd rattling-like sound on high frequency, and it's a quiet but faintly audible). Easiest to notice when scrolling image-heavy webpages as fans don't disturb it.

If I run on stock clocks with everything set "auto" in bios, it's easily audible.
If I run it oc at 4.6 GHz letting the motherboard set everything it's almost inaudible.
If I run it at any clock with all 4 cores synced to the same ratio it's completely inaudible.

I tried listening to it with a paper tube, and the sound seems to come from somewhere around the cpu, it's fainter around the PSU than at the CPU, however I'm not sure of the source as they are pretty close together in this case. Any ideas what it is and if it's dangerous?

Also, I've tried to make this as quiet a system as possible, so I created a manual curve for the case fans so they would not turn on unless the CPU reaches 55c. This makes it idle at around 40-42c and when overclocked it runs at around 65-67c while stress testing (with an initial spike reaching 80c due to the time needed for the case fans to start and to blow the accumulated warm air out). Is this a problem, do a bit higher than usual idle temps hurt or do only load temps count? I'm not worried about the initial spike, as under normal circumstances (gaming, rendering, etc) it doesn't reach 70c ever.

Another thing I noticed is that on many settings I get thermal throttling. Obviously not on the one I described above, but for example if I set bios to the Asus optimized settings, according to the Intel xtu benchmark I get thermal throttling at around 50c and temps never go above 55c. Why is that? Is xtu reading something wrong (like maybe it reads some power throttling as thermal), or is there a setting in bios that lowers the thermal threshold? With my usual settings I can reach 80c and run at almost 70c for a long time without getting any throttling at all and I think that's normal, but throttling at 50c is not.

Thanks for your time and input, I hope I was clear as English is a second language for me.
post #2 of 11
Could it be your graphics card?
post #3 of 11
Which Corsair 650W PSU are you using?

RM-650W? CX650?
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post #4 of 11
Thread Starter 
Quote:
Originally Posted by kl6mk6 View Post

Could it be your graphics card?

At first I thought it was the hdd, then my second guess was good old coil whine from the GPU, but it's much louder on the right side (when looking at it from the front), and the GPU is on the left side, so I would say it's not the GPU.
Quote:
Originally Posted by benjamen50 View Post

Which Corsair 650W PSU are you using?

RM-650W? CX650?

CS650M. Besides the RAM that's the only thing that is not new in the system, and it was working fine until now.

Thanks
post #5 of 11
Thread Starter 
A small update, hoping that someone might have an idea:

It goes away if in the bios the core ratios are set manualy. So despite what I wrote above, they don't have to be synced, they just have to be set manualy. I've tried other settings, manual core voltage, turbo boost settings (setting limits to maximum as it does that automaticaly when core ratios are set manualy), turning off VR faults, VR efficiency, etc, nothing seems to have any effect, only setting core ratios manualy, which completely removes the noise.
post #6 of 11
Quote:
Coil whine is mechanical resonance of the coil with the frequency of the signal passing through it. Physically, a coil is just loops of wire, sometimes with a core other than air. If the frequency of the signal is in resonance with the physical wires of the coil, the coil may vibrate.

So your hearing the coil vibrate as its hitting a frequency you can hear, at times the coil whine maybe occurring and as its not in the frequency of sound you can hear; so you'd be oblivious to it happening.
Quote:
Originally Posted by Erion View Post

It seems to be either the vrms or the capacitors whining.

Create a paper tube and then use that to hear and assess where sound is coming from.
Quote:
Originally Posted by Erion View Post

In the meantime I figured out that setting the core ratios manualy sets the CPU power phase control to "extreme", and while that setting stops the whining, it does cause me to thermal throttle at as low as 55c even on stock clocks, so it might overheat something on the mobo as it's obviously not the cpu that is throttling. However this also happens if i set a huge room fan right next to the open case and blow a lot of fresh air right at the vrms' heatsink.

If I set power phase control to "standard" or ASUS "optimized", there is no thermal throttling at all, but it is squealing.

Changing CPU Power Phase Control shouldn't create throttling IMO.
Quote:
CPU Power Phase Control can be set to Extreme to keep the number of active power phases of the CPU VRM at max for the whole time instead of powering down phases when CPU idles. This may gain a little more margin for stability when trying to achieve maximum core frequency. Alternatively, user can adopt Standard for down phase with respect to the change of the Intel PSI signal, optimized for better power saving, or define the custom down phase frequency manually. The faster the switch, the closer it is to setting CPU Power Phase Control to Extreme, just with the down phase capability.

Above from Link:- http://rog.asus.com/254052013/maximus-motherboards/recommended-settings-for-overclocking-maximus-vi-motherboards/

In your case I think custom would be setting CPU Power Phase Control to Power Phase Response, then you can select Ultra Fast, Fast, Medium, Regular.

I've read similar occurrence on ROG forum where posters eliminate whine by changing CPU Power Phase control.
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The Stilt Machine
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XPS - i5 4690K
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Hard DriveCoolingCoolingCooling
Samsung Evo 840 ThermalRight Archon IB-E X2 + 2x TY143 ThermalRight TY-143 2x front case intake Arctic Cooling F12 + 2x F9 as rear case exhaust 
OSMonitorKeyboardPower
Win 7 Pro x64 / Win 10 Pro x64 Asus MG279Q Cherry MX-Board 3.0 Cooler Master V850 
CaseMouse
SilverStone TJ06 Logitech G700S 
CPUMotherboardGraphicsRAM
i5 4690K@4.9GHz 1.255V Asus Maximus VII Ranger Sapphire Fury X@1145/545 HyperX Savage 2x8GB 2400MHz C11 
Hard DriveCoolingOSMonitor
Samsung Evo 840 TR Archon SB-E X2 Win 7 Pro x64 / Win 10 x64 Asus MG279Q 
KeyboardPowerCaseMouse
Cherry MX-Board 3.0 Cooler Master V850 SilverStone TJ06 Logitech G700S 
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post #7 of 11
Thread Starter 
I've just tried setting it manualy, OCCT stressing results:

Regular: Whine present, no throttling, max CPU package temp 72c
Medium: No Whine, throttling starts at CPU package temp around 65, max package temp reached 69c.
Fast: Whine present, no throttling, max CPU package temp reached 75c
Ultra fast: Whine present on a little bit higher frequency, no throttling, max CPU package temp reached 74c.

All of these are after AI suite fan tuning with profile set to standard, I tried medium with full speed, because all the fans are running at max 50% with standard, but same results, except max core temp reached is 63c and during the test it stays below 60 after that initial spike.

So it's only the medium setting that removes the whine and introduces throttling. I also touched the heatsink over the vrms during all four, no difference, it's pretty cool, feels a bit cooler than my finger. The white stuff that's at the bottom of the heatsink doesn't seem to be melted to my eyes at least, and it seems to be covering everything correctly.

Also, those max package temps are initial spikes just as the test starts, then it settles about 5c lower, IMHO my core temps are quite alright.
post #8 of 11
Thread Starter 
Intel xtu benchmark scores:

Regular: 76c, whining, no throttling, 917 marks
Medium: 72c no whining, no throttling (!), 908 marks
fast: 77c, whining, no throttling, 915 marks
ultra fast: less whining, no throttling, 913 marks
extreme: no throttling, no whining, 909 marks

After this I tried OCCT with extreme, no whining, but throttling fast. All these OCCT tests were done only for a few minutes and with small data set, and after seeing no throttling in xtu I tried medium data set in OCCT. With extreme setting, throttling starts after 2 minutes instead of 30 seconds as with small data sets, large data sets produces the same results. Setting power phase control to medium seems to produce the same results as extreme.
post #9 of 11
Are you sure it's not your fan when it spins up with CPU load due to temps? It could also be coil whine from the VRM.
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post #10 of 11
Thread Starter 
Quote:
Originally Posted by cookiesowns View Post

Are you sure it's not your fan when it spins up with CPU load due to temps? It could also be coil whine from the VRM.
Yes, sure, tried spinning them up one by one. Coil whine from vrms is the most likely suspect at this point, yes smile.gif
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