Core i7 8700k temps

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sanitarium16

Limp Gawd
Joined
Dec 5, 2007
Messages
328
Had my old 4790k running at 4.6ghz all cores and highest temps got were 85C using a thermaltake frio 140. Stock my temps on my 8700k are 30C idle and 91C load running prime 95 using a corsair h60 water cooler. Trying to run all cores at 4.7ghz results in thermal throttling. Does the extra 2 cores really generate that much more heat?!
 
120mm AIO water coolers are generally inferior to high end air coolers.

Skylake architecture also does far more work per clock, especially in AVX2 that prime95 tests.
 
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What voltage?

I’m at 1.28 volts 4.8ghz and prime small FFT gets about 74C after half an hour. Blend goes up to 82C.

This is on a kraken x62
 
My temperatures are getting high also but I'm using a corsair hyrdro H100i v2. If I use the new Prime95 ver 29.3 I get around 89C, and if I use Prime95 ver 26.6 I get around 69C (small FFT) This is with no over clocks. I installed the cooler with the stock tim on the cooler so I'm going to reapply with better tim, manually set the voltage, and try to overclock.

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nanotube said:
My temperatures are getting high also but I'm using a corsair hyrdro H100i v2. If I use the new Prime95 ver 29.3 I get around 89C, and if I use Prime95 ver 26.6 I get around 69C (small FFT) This is with no over clocks. I installed the cooler with the stock tim on the cooler so I'm going to reapply with better tim, manually set the voltage, and try to overclock.

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I returned the h60 and got the h90. Its a 140mm fan and bigger radiator. Using prime 95 i am getting 89c too stock. When i stress test using the intel xtu software im getting 72c. 13c lower with the h90. When i OC all cores to 4.7 hitting 100c and still getting throttling.
 
Cali3350 said:
What voltage?

I’m at 1.28 volts 4.8ghz and prime small FFT gets about 74C after half an hour. Blend goes up to 82C.

This is on a kraken x62
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Didnt tweak the voltage left it on auto. I just wanted all cores to run at 4.7ghz
 
Have you considered a delid? If Coffee Lake is anything like Kaby Lake, you're looking at a potential 20°c drop. Specialized delidding tools like the Rockit88 make the process about as simple and safe as can be.
 
sanitarium16 said:
Didnt tweak the voltage left it on auto. I just wanted all cores to run at 4.7ghz
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worse error *EVER*, one does not simply go to BIOS and set an overclock with autovoltage.

your issue it's that, when on auto the mobo will provide excessive amounts of voltages even at stock if certain features as Asus multicore enhancement are enabled (which are by default).. since Ivy Bridge I always, always recommend to utilize a -0.005v offset to voltage to avoid that kind of issues.
 
Araxie said:
worse error *EVER*, one does not simply go to BIOS and set an overclock with autovoltage.

your issue it's that, when on auto the mobo will provide excessive amounts of voltages even at stock if certain features as Asus multicore enhancement are enabled (which are by default).. since Ivy Bridge I always, always recommend to utilize a -0.005v offset to voltage to avoid that kind of issues.
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Yeah I personally see what multiplier is stable with a very small offset like you use. Then I'll start ramping it up as required. If you don't want to spend any time I guess auto voltage is useful along with whatever auto OCing features boards may use. Shouldn't be surprised though if you use those features for it to just throw tons of voltage at the CPU to keep it stable. As another note make sure you are not applying too much thermal compound. That can easily cause an increase of ~10C+
 
Araxie said:
since Ivy Bridge I always, always recommend to utilize a -0.005v offset to voltage to avoid that kind of issues.
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I haven't done any serious overclocking in a while...is 5mV really enough to make much of a difference?
 
EchoWars said:
I haven't done any serious overclocking in a while...is 5mV really enough to make much of a difference?
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Voltage has a huge influence on temps. Even that small of a chance will likely make a noticeable difference.
 
EchoWars said:
I haven't done any serious overclocking in a while...is 5mV really enough to make much of a difference?
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yes it does that difference because it work as a cap for the voltage, so it wont go wild or with crazy amounts that some motherboard provide, that's the huge difference it can make in temps, as most motherboard on auto can even apply a huge 0.200V over stock voltage while are under heavy stress like prime95 and such kind, applying a minimal negative offset also help to know the closest value to *Stock* voltage of every CPU
 
Araxie said:
yes it does that difference because it work as a cap for the voltage, so it wont go wild or with crazy amounts that some motherboard provide, that's the huge difference it can make in temps, as most motherboard on auto can even apply a huge 0.200V over stock voltage while are under heavy stress like prime95 and such kind, applying a minimal negative offset also help to know the closest value to *Stock* voltage of every CPU
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Ah! So it's not the 5mV per se, it's the effect that a manual adjustment has on capping the auto function of the bios.

I got that right? Sorta?
 
sanitarium16 said:
I returned the h60 and got the h90. Its a 140mm fan and bigger radiator. Using prime 95 i am getting 89c too stock. When i stress test using the intel xtu software im getting 72c. 13c lower with the h90. When i OC all cores to 4.7 hitting 100c and still getting throttling.
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Dont feel bad. I use a full custom loop with an EK block and big powerful pump. Guess what.... these things are friggin hot as hell. Nothing we can do about it except take the lid off and put a better compound down.

I will probably order a delid tool and whatever the forums recommend for a TIM solution. I am still debating whether or not I want to keep the I7. I have a killer Threadripper 16 core build as well and it games perfectly fine at high resolution. The intel is still faster at gaming overall though.
 
I feel like this is a fad that only started recently. Possibly spearheaded by youtube reviewers. It was not always like this. For mainstream ststem cooling, $100 solutuions were the max.
 
Intel could do a much better with their thermal interface material ( TIM ) choice. The biggest reason they don't it not because of cost but rather they want you buying new CPU's much more often. It's not a design feature or cost feature but a marketing decision.

Intel has clearly stated in the past that some of their quarterly growth issues were directly linked to people keeping their CPU's longer.
 
SixFootDuo said:
Intel could do a much better with their thermal interface material ( TIM ) choice. The biggest reason they don't it not because of cost but rather they want you buying new CPU's much more often. It's not a design feature or cost feature but a marketing decision.

Intel has clearly stated in the past that some of their quarterly growth issues were directly linked to people keeping their CPU's longer.
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On the Tim, yes everyone bitches but what what you recommend?
 
delid is the way to go.
I love my rockit 88 & 99 i have so far delidded 7 cpus this year with them most recently yesterday delided a brand new 7740x (x299 7700k) saw the biggest temp drop by far post delid on this one a whopping 30C drop in load temps! the 1151 cpus usually drop about 10-20C depending on how bad the original TIM job was from intel.
 
Frito11 said:
delid is the way to go.
I love my rockit 88 & 99 i have so far delidded 7 cpus this year with them most recently yesterday delided a brand new 7740x (x299 7700k) saw the biggest temp drop by far post delid on this one a whopping 30C drop in load temps! the 1151 cpus usually drop about 10-20C depending on how bad the original TIM job was from intel.
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I'm uncomfortable with the phrase "TIM job".
 
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