8700k Idle 45-50 Scythe Fuma

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fab.lim1977

Feb 21, 2018
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PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i7-8700K 3.7GHz 6-Core Processor (£308.95 @ AWD-IT)
CPU Cooler: Scythe - FUMA 79.0 CFM CPU Cooler (£63.00 @ Amazon UK)
Motherboard: Asus - ROG STRIX Z370-E GAMING ATX LGA1151 Motherboard (£189.25 @ BT Shop)
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory (£176.80 @ AWD-IT)
Storage: Samsung - PM961 256GB M.2-2280 Solid State Drive (£98.99 @ Overclockers.co.uk)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive (£47.94 @ Aria PC)
Video Card: MSI - GeForce GTX 1080 Ti 11GB GAMING X TRIO Video Card (£894.24 @ Novatech)
Case: Deepcool - KENDOMEN Red ATX Mid Tower Case (£59.99 @ Amazon UK)
Power Supply: SeaSonic - 1050W 80+ Platinum Certified Fully-Modular ATX Power Supply (£243.90 @ Amazon UK)


CPU Core and Package temps in CPUID HWMonitor when I'm surfing chrome (no videos) and no other applications open are 40-50 degrees celsius. Have used the Scythe Fuma cooler since I've read it's one of the best performing coolers for it's size. Any ideas on why my core temps are so high?

MCE and XMP is enabled but besides that I have not applied manual OC and Vcore at 1.264V most of the time when I'm idling in desktop (i.e. just using chrome)

Something is wrong with my 8700k? Pretty sure the temperatures are not supposed to be this high when others are getting 50 degrees under gaming with their Scythe Fumas. I have all 5 fans in the case operating from the PSU. GPU temps are fine in idle around 37 degrees. Under MCE all cores are always clocking around 4300mhz. First time PC builder here so go easy! :)
 
Solution
EpIckFa1LJoN
I'm not saying the cooler is bad by any means. I just don't think it's quite as good as you think (specifically the 50C gaming loads) you also need to take into account these guys are testing with a 4770k. The 8700k runs MUCH hotter. Don't expect to see similar temps with anything but another 8700k.

I'm pretty sure it's just the paste in any case.
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EpIckFa1LJoN

EpIckFa1LJoN

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Check background CPU usage, you may actually not be "idle"

And I'm not too sure about those figures from other users with that same fan. I have a pretty good airflow case and a Corsair H115i and my gaming load temps on my 8700k stock are about 50-55C. No offense but I highly doubt that any air cooler that isn't a Noctua NH-D15 is matching/beating that performance.

Not only that, but on Tom's review of the 8700k they also have an AIO cooler (Alphacool Eisbaer 420 to be exact), and are reporting 65-70C Gaming temps @stock.

So the CPU itself does run hot.

My "idle" temps are around 28-30C also for reference, ambient temp around 21-22C.

So I'm going to say your "idle" temps are not necessarily idle and that the CPU already runs hot. If you are browsing you are using some of the CPU. If you have anything running in the background you are not truly idle.

Furthermore, if you're like me, everytime you browse the internet you are bombarded with ads, some that play video even in the background. Those also take up some resources.

The definition of "idle" means you're not doing anything. Browsing means that you are actively using your computer. It may not be gaming loads but it is by no means "idle"
 
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fab.lim1977

Feb 21, 2018
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Fair enough on your point regarding not truly idling, but even leaving my computer on idle (with only HWMonitor running) I see temps of about 35-40 so about 10 degrees more than you.

I'm not sure about the population being familiar with it, but the Scythe Fuma is widely recognised to be one of the very top few air coolers made in the world, with performance consistently beating even the NH-D15 (see http://www.overclockers.com/scythe-fuma-heatsink-review/ or https://pcpartpicker.com/forums/topic/244489-best-air-cooler#cx2543389 for a start) at half the price and size. It outperforms all 120mm AIOs and outperforms most 240mm AIOS as well and even some larger water-cooling systems. So please forgive me if I had high expectations for temps coming in for the cooler... thought there were other things I might have done wrong. I'll get Grizzly Kryonaut and reapply thermal paste since I was using stock paste from Scythe and see if temps go down more.
 
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EpIckFa1LJoN

EpIckFa1LJoN

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For starters, never trust reviews that come directly from manufactures. They are extremely biased.

https://www.tweaktown.com/reviews/8409/scythe-fuma-rev-cpu-cooler-review/index6.html
https://www.techpowerup.com/reviews/Scythe/Fuma/6.html

Secondly, no it's not a bad cooler, it's not quite as good as a NH-D15, and it certainly is not going to beat a good AIO cooler (of any size even the H80 beats it and that's a 120mm radiator), of which there are numerous, including Tom's test cooler (Alphacool Eisbaer 420). But your expectations of it are quite high.

I'm not saying you don't still have a problem just that the problem might not be as bad as you think it is. You could change out the paste, I always do regardless, because manufacturers for the most part use cheap paste and may not quite use enough. But even then I wouldn't quite expect to see temps equal to or even lower than what other people are getting with high-end AIO coolers.

Kryonaut Thermal Grizzly is the best paste there is, and if applied properly could potentially reduce the temps to what they are supposed to be.

But again I wouldn't expect to see gaming temps in the 50's unless it is not a really intense game. The LOWEST my gaming temps ever get are 45C on single threaded games. On good multi-core games it's in that 50-55C range. Your temps will more than likely be in the 55-65C range, possibly higher. It seems Tom's may have gotten a bad chip since their tests show 65-70C (my burn tests don't even go past 66C). I'd say idle, based on my experience with my chip, and scarce other reviews I've seen that show idle temp, you're idle temps should be about 32-35C depending on your ambient temps (and case fan orientation). You're not far off.

It may entirely be the paste, and with my estimated range, changing the paste may give you the temps you are supposed to have.
 
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fab.lim1977

Feb 21, 2018
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Tweaktown review is invalid - it's talking about the Scythe Fuma Rev B which is universally inferior to the original Scythe Fuma I was using that allows for substantial mounting pressure. Not sure what the second link is trying to tell me - it comes within 1 degree Celsius in ALL testing scenarios vs the DH-15 and beats it in OC AIDA64 performance (which is well within margin of error in temperature testing) which kinda supports my point as the best air cooler out there. Conclusion of the same reviewer also gives 9.1 indicating exceptional performance, so I would be well placed to expect the same temperatures as the DH-15 at least. Even the tweaktown review comes to a similar conclusion: 'The hardware is some of the best money can buy for a tower cooler.' But my seems drastically different from the idle temps indicated in the second review you provided, they're getting 23 degrees idle on coolers? https://www.hardocp.com/article/2017/01/12/scythe_fuma_scfm1000_twin_tower_cpu_air_cooler/3 shows that it is within 3 degrees of the best AIO coolers they have ever tested under idle temps, the Corsair H110i and Glacer 240L and is the third best cooler they have ever tested under overclocked performance, beating all other AIOs including the top ones mentioned above etc etc. The numerous reviews showing exceptional performance is a main reason why I am expecting a lot out of this, but I am talking only about the original Scythe Fuma cooler model which is the one I have.

Thanks for your help, I think I will try changing the paste and see how it goes.
 
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EpIckFa1LJoN

EpIckFa1LJoN

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Okay I assumed rev B was similar enough.

However, the H110 is not among the best AIO coolers and according to all the reviews it is what I would consider on par with that.

It's still not going to be anywhere near a H115i, Kraken x62, or Alphacool 420. And I'm personally telling you unless you have some fantastic chip that runs at stock at a stupid low voltage you're not going to see multicore gaming temps of 50C.

Did you change the paste to see if it helped?
 
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EpIckFa1LJoN

EpIckFa1LJoN

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I'm not saying the cooler is bad by any means. I just don't think it's quite as good as you think (specifically the 50C gaming loads) you also need to take into account these guys are testing with a 4770k. The 8700k runs MUCH hotter. Don't expect to see similar temps with anything but another 8700k.

I'm pretty sure it's just the paste in any case.
 
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mdd1963

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Jan 14, 2006
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HWMonitor will show what the temps are under load...

I would not expect to see 50c temps (that would be quite low!) under gaming loads, especially with XMP/MCE on/enabled, where the MB will try to clock your 6 cores as high as 4.7 GHz under load, if cooling is adequate....

My own 7700K runs 59C under Battlefield 1 loads (using Noctua D-NH15) with XMP/MCE on, at up to 4.5 GHz for quad core laods...; can't imagine a 6 core CPU at higher clock speeds running cooler
 
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