CPU and MOBO temp spikes, why?

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lksmithuk

lksmithuk

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So I have recently installed an i7 7700k into my ASUS Maximus Ranger VIII, I bought this CPU after doing my research tp make sure the MOBO was compatible, it seemed to be fine. After installing and reisntalling with fresh thermal paste (Artic Silver 5) the CPU and MOBO temps seem to spike up to the 60-70 mark. At idle they sit at 35-40 but when I run any kind of application (even Spotify or Steam) they spike and I hear the fans speed up! Can anyone shed any light on this? Cheers guys

 
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Karadjgne
I have a h55, sitting on a i5-3570k at 4.3GHz. No worries on that cooler for the i7. There's a couple things to think about. Liquids have a very large capacity to absorb heat energy, far greater than metals. It honestly takes a lot of heat energy to raise liquid temps by even 1°C, metals change temps almost instantly. Huge difference. The spikes you see are normal for that cpu, especially if you are pushing a 1.32 VID. You have a K cpu, undervolt it! I don't ever see temps over 55°C unless I'm stress testing p95 small fft, and then it reaches 67°C, after 1/2hr test. My i5 runs at 1.114v. So higher stock voltages are going to result in higher load temps. They will also result in higher mobo temps as the VRM's and other voltage regulatory...
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Sedivy

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7700k does run hot so it's not too surprising. That being said, steam alone should not spike it that high. Can you run hwmonitor when this happens and screenshot the output? What is your cpu cooler? How well mounted it is, is usually the first suspicion in spiky cpu temps. Or if it's a particularly poor model for a fairly hot cpu. Your idle temps look ok but it's strange your system temps are this high as well. Which case and how many fans do you have? Which gpu? How clean is your case inside (meaning how many obstructions from wires, cages etc. are there to airflow)?
 
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Karadjgne

Karadjgne

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It's Intel. The temp registers are actually on the cores, so any deviation in temp is almost instantly registered, usually before that temp can be effectively dissipated by the cooler. You are talking electronic speeds vrs physical heat transfer speeds, so yes, Intel cpu's will spike. Alot. Upon opening any app, doesn't matter how small, even just opening another window will make the cpu spike. It's work, so will happen. This is entirely normal behavior. So no worries there.

What's more important than spike temps is sustained average temps. And this is affected by several sources.
Ambient temps. If it's 40° in the room, best case scenario is that the cpu would see 40° at idle, but that never happens, cpus usually sit about 10° or so above ambients.
Case cooling. No matter what ambients are, if there's no decent airflow in a case, the heatsink can't work effectively, temps sit high.
Heatsink. A heatsink can only do so much, affected by both ambient temps, case temps, airflow, size and source. Sticking a core2duo TDP cooler on an i7 is a recipe for disaster.

That said, what's missing in your system? Small cooler? High ambients? Bad airflow? Any combination? Doesn't take much to add 2-3° on one thing, spread that across 2 or 3 things and you got an extra 10°. Windows can also be an issue, updates have a bad habit of changing a few settings without telling you.
 
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lksmithuk

lksmithuk

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I am using a Corsair H55 liquid cooler, pretty small I know, but I thought it would do until I can buy a custom EK loop for the CPU/GPU. I am running a GTX 1080 which is also pretty new. I am starting to wonder if my 550W PSU might not be able to support my current system and maybe its causing spikes??
This is idle
qsux61.png

Then this is after opening up Spotify
v6m52o.png

 
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lksmithuk

lksmithuk

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33vkf3b.jpg


These are my temps whilst playing PUBG, I will be getting a Phanteks Enthoo Pro M case soon which im sure will provide better airflow until I get my liquid cooling loop in there. I have 2 120mm front case fans pushing air into the case and the fan/rad from the Corsair H55 on the rear, then another 120mm at the bottom pushing air onto my gpu which is a blower type. Unfortunately there is no more room for a fan to pull air out of the case, hence the decision to buy a better case.

Thanks for all your advice, I appreciate it.
 
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Sedivy

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56 for gaming PUBG is quite acceptable actually, as are your graphics card temps. They will go down with a bit improved intake airflow with the new case. Get your most powerful case fans for the front intake. This is a nice video on temps and airflow in case https://www.youtube.com/watch?v=8OmkmluAYAQ

As for sudden spikes on spotify, keep in mind that the length of these spikes matter. Opening anything, a youtube video, an application, will cause a momentary spike in my cpu and cpu temps, that's just the way intel/windows is. But it comes right back down. If this is what you're seeing, then don't worry about it. If it lasts much longer then a 5-10 secs, for just spotify, then something might be revving it up other than just spotify and time to get into task manager and resource monitor and see what's bogging down your cpu. 60C for spotify and 56 on PUBG just looks very odd.

The most curious part of that second image is the mobo temp sensor. Motherboards can have several. If you load up AI suite 3, can you see where this temp sensor is located? I'd be curious to see if it's something to do with vram/mosfet, if it's near the 1080 or if it's far away from most heat sources and just reflecting poor system cooling.
 
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lksmithuk

lksmithuk

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Yeah its the MOBO temps that are concerning me the most, I ws just playing a game and the CPU and GPU were around 5-60 under load, but the MOBO was reaching 70! Here are the sensor locations so maybe it is the GPU giving off heat to the sensor nearby?

9h536u.png
 
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Sedivy

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Hmmm. I don't have an asus board so I can't tell you what the screen looks like but in the MSI equivalent of the AI Suite, when I go to advanced, and then senors, it pops up an image of the mobo with readout of the temp and where the sensor is located.
The bios will have it for sure but the idea is to see the readout under load which bios isn't.
Here's a review of an asus board where images of ai suite 3 are features. Third image down has what I'm expecting you to see:
https://www.eteknix.com/asus-sabertooth-z170-s-lga1151-motherboard-review/5/

Ahh ok never mind I see you found it. Hmm it mentions 4+3 thermal sensors. Discarding for now the ext fan card 3 and 1 from the cpu, that leaves 3 sensors on the mobo it could be. Any chance you can tell which one it is by comparing temps in the suite with hwinfo or hwmonitor? The sensor names sound like what HWMonitor outputs but I'm not sure if they'll correspond. HWInfo I didn't see list the name of the sensor it used for mobo reading.

Or..wait that's a promo image for your mobo but not the ai suite? It should look similar to that somewhat. Check the link i posted above. The part of AI suite that does this should be called thermal radar. If you mouse over any of the sensors on the image of the mobo or on the list, see if the name pops up.
 
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lksmithuk

lksmithuk

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I have just checked thoughout the AI Suite 3 and cant find it, Im pretty sure my motherboard doesnt support the Thermal Radar software. Maybe I will just open up my case and make sure all the sensor areas are clear/clean and see how that goes until I can get myself a new case!
 
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lksmithuk

lksmithuk

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My case is an InWin 703, with a 120mm CPU liquid cooler rad/fan at the back, and 2 fans in the front. I know its a crappy case, got a bit carried away buying the components first, next up is a new case, going for the Phantek Enthoo Pro M.
 
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Sedivy

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Not a bad case, though the new one will be much better for that cpu. If you have the 2 fans in front and one in the back, without that drive cage that's ok amount of air moving. With the hdd cage populated, intake is admittedly less effective. Hum I guess it's wait and see approach. I'm still curious about the mobo temps, but without knowing which sensor it is, it's hard to say what the issue might be.
 
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lksmithuk

lksmithuk

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I just thought that the airflow wouldnt be very good with the 120mm radiator restricting it at the back, I took out the spare HDD trays as I could t find a way to remove the whole bracket. I also took out the PCI WiFi card as it wasnt being used anymore. I will get the new case at the end of the month so its not too big an issue
 
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Sedivy

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Ah i see. If that front cage is removable...well actually you know what? You're getting a new case, so don't worry about it. I was gonna suggest to try mounting it up front, to help not make it so cramped around the vram area, but since it's all going to be moved anyway, that would be a lot of work for little reward.
 
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Karadjgne

Karadjgne

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I have a h55, sitting on a i5-3570k at 4.3GHz. No worries on that cooler for the i7. There's a couple things to think about. Liquids have a very large capacity to absorb heat energy, far greater than metals. It honestly takes a lot of heat energy to raise liquid temps by even 1°C, metals change temps almost instantly. Huge difference. The spikes you see are normal for that cpu, especially if you are pushing a 1.32 VID. You have a K cpu, undervolt it! I don't ever see temps over 55°C unless I'm stress testing p95 small fft, and then it reaches 67°C, after 1/2hr test. My i5 runs at 1.114v. So higher stock voltages are going to result in higher load temps. They will also result in higher mobo temps as the VRM's and other voltage regulatory circuitry surrounding the socket area are having to deal with those voltages. 70ish is absolutely normal for that circuitry, if it starts broaching 90°C then I'd be worried.
You have an Aio. One of the minor drawbacks is lack of bleed air. Most aircoolers, aftermarket or stock have air that's either blowing down by design (stock type coolers) or has air that escapes the sides (bleed air from tower types) that provides a breeze across the components surrounding the socket. Aios having no fan at that location, just the pump, will suffer slightly for mobo temps. Best solution I've ever seen (especially for that h55) is to get a Noctua nf-f12. It's a much better, quieter fan than the stock h55 has and has a side benefit. Noctua cares enough to provide both a low voltage adapter (LVA @9v) and a ultra low voltage adapter (ULVA @5v). Swap the fans out, and use one of the adapters on the Corsair fan and zip tie it to the back of the optical cage.
Between lowering vcore voltages and adding the fan breeze across the socket area, this should solve ant temp issues you may have worries over.

Just remember, it's sustained temps that are important, spike temps are almost meaningless to an aio. Any aio temps need at least a half-hour for the cooler to acclimatize and stabilize, so fluctuations are very common until that happens.
The h55 is equitable in ability to a hyper212 if that helps any.
 
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