I7 4790k hitted 95c, is it okay?

[Maeg_DK]

So after I wad done rendering my video, I went to check how my temps was under the procces and to my big suprise i noticed that it have ran around 90-95 degress. So now I basicly just want to know if my cpu could be damged?

Im also using the standard cooler, but have bought an h100i

 

[Darkbreeze]

For not running a stress test, and simply rendering video as a normal process, your temps are WAY too high. You either have insufficient case airflow, incorrect cpu cooler mounting pressure, applied the CPU thermal paste incorrectly or the cpu fan isn't facing the right direction.

 

[Maeg_DK]

I am totally aware of that my temps are to high, I just want to know if my cpu is okay? And not suffered any damage.. Might want to add more thermal paste when I change the cooler

 

[Darkbreeze]

No, you don't want to ADD more thermal paste. What you need to do is clean off ALL the thermal paste using isopropyl alchohol and a lint free cloth or coffee filter from the cpu lid and then apply an uncooked rice grain sized amount of thermal paste directly to the center of the CPU lid prior to installing the water block/heatsink. Be sure to follow the directions for mounting pressure exactly. Make sure you have sufficient case airflow and that all fans are oriented facing the correct direction.

Front and bottom fans should be intake and rear or top fans should be exhaust, unless you have a top mounted radiator in which case orienting the radiator fans as intake is probably the best option so long as you have a good 120 or 140mm rear exhaust installed. Bottom or front mounted radiator configurations are a lot more efficient, so that the top fan locations can also be used as exhaust in addition to the rear exhaust.

At that temp it's doubtful you damaged anything yet, since it only begins throttling the 4790k at 100°C and thermal shut down doesn't occur until about 15-20°C beyond that.

 

[The Original Ralph]

if it helps, i'm running an i7-4790 (locked or non-K) and render quite a bit of video. This was my first build - I ran this computer for 3 months rendering a ton of vids, some files that took 1 - 3 hours to render and for whatever reason, downloaded XTU and saw my temps were at 99-100C nearly 100% of the time while rendering those files. My motherboard mfgr's performance utility never showed cpu temp above 67C and i've since un-installed it, but that utility gave me a false sense of safe temps.

I've since corrected the issues and when i run XTU (intel's Extreme Tuning Utility) benchmark tests, i post scores that are within the top 2 benchmarks posted on the web (once you run the benchmark, the utility will go online and compare your score to others. The CPU has built in safety limits and will throttle power & current when thermal limits are hit. I haven't seen any damage to my CPU but from what i've learned, i've probably shortened the life of my CPU - it's been 2 months since i corrected the overheating issue and computer running fine.

One thing i would do while you're waiting for the new cooler, check that your intel cooler's push pins haven't popped out - mine had two that had popped, and that alone kept heat from transferring into the cooler.

Two links on the intel community's web that you might want to read thru

Troubleshooting Intel® Core™ i7-4790K / i5-4690K overheating

and this 2nd one is a 39 page discussion thread - you can speed read the first 15-18 pages but there's some helpful info in there

How best proceed with overheating i7-4790K?



There are links in both those threads to various intel documents, but fwiw, intel's specs call for recommended max temp of 74C (+/- 5C) and absolute max temp of 100C

and what grandmaster said about the thermal paste, you do NOT want to put too much - there are stickies here on Toms as well as vids on youtube, but basically some folks state 1/2 the volume of a green pea or the volume of a lentil of thermal paste (after cleaning the heatsink and cpu contact areas with 91% alcohol) - some folks put 2 or 3 thin lines (again, total volume = the volume of a lentil), some put 5 small dots of thermal paste, - there are a ton of variations, but main point, too much thermal paste is counterproductive. It's purpose is just to fill microscopic voids between the two surfaces

 

[Darkbreeze]

No, that's wrong. It's right, but it's wrong. Those are not the correct specs for Intel I-series Haswell refresh CPUs. Thermal trip won't occur until about 115-120°C and throttling won't even begin until about 98°C

The TCase specification is intended for mass system builders only. That 66.8 degree number or whatever it is for your CPU is useless information for the individual end user. This temperature can only be correctly measured by cutting a groove into the top of the heat spreader and then you need to mount a calibrated thermocouple at the geometric center of your CPU. No one that just shelled out $1000 bucks for a CPU is going to take the Dremel to it No software can be used to accurately measure the TCase temperature so you are left with a number that means nothing to the individual end user.

Intel CPUs determine thermal throttling and thermal shut down based on the core temperature. The data coming from this sensor is like a reverse thermometer. As the CPU gets hotter, the data from this sensor counts down. When it reaches zero, you have reached the maximum safe operating temperature. The temperature this occurs at is commonly called TJMax or the maximum junction temperature. When it reaches this temperature, thermal throttling begins to try and keep the CPU core temperature from going any higher. Core i CPUs let you read the value for TJ Max by reading a register within the CPU. This register is fully documented by Intel for desktop and mobile CPUs. The throttling temperature is approximately 98C to 105C for the majority of their recent CPUs but you need to use software like RealTemp or Core Temp, etc. to find out what this value is.

The thermal throttling temperature has nothing to do with the thermal shutdown temperature. There is a signal in the CPU called THERMTRIP. This goes active and forces the CPU to do a thermal shutdown when the core temperature gets approximately 25C higher than the thermal throttling temperature. If the throttling temperature is 100C to 105C then the shut down temperature is not until 125C to 130C.

Asus software like their AISuite II shows more useless temperature information. The sensor being sampled may be 100% accurate but it is so far away from the hottest spot on the core that it doesn't matter what it says. It's just a number. You need to use core temperature monitoring software like RealTemp or Core Temp.

Too bad Intel doesn't hire someone to answer their phones that has actually read some of their documentation. The person you spoke to had about as much useful information about Intel CPUs as the greeter at Wally-Mart has.

As per the Intel temperature guide by Computronix, who knows his shiznit better than just about anybody else around:


4th Generation 22 Nanometer: 4790K (TDP 88W / Idle 2W)

Standard Ambient = 22C
Tcase (CPU temp) = 74C
CPU / Core offset + 5C
Tjunction (Core temp) = 79C
Tj Max (Throttle temp) = 100C

And thermal tripp, which is the absolute max temp at which the system will shut down, is about 15-20°C beyond the Tj Max spec.

 

[The Original Ralph]

No, that's wrong. It's right, but it's wrong. Those are not the correct specs for Intel I-series Haswell refresh CPUs. Thermal trip won't occur until about 115-120°C and throttling won't even begin until about 98°C

The TCase specification is intended for mass system builders only. That 66.8 degree number or whatever it is for your CPU is useless information for the individual end user. This temperature can only be correctly measured by cutting a groove into the top of the heat spreader and then you need to mount a calibrated thermocouple at the geometric center of your CPU. No one that just shelled out $1000 bucks for a CPU is going to take the Dremel to it No software can be used to accurately measure the TCase temperature so you are left with a number that means nothing to the individual end user.

Intel CPUs determine thermal throttling and thermal shut down based on the core temperature. The data coming from this sensor is like a reverse thermometer. As the CPU gets hotter, the data from this sensor counts down. When it reaches zero, you have reached the maximum safe operating temperature. The temperature this occurs at is commonly called TJMax or the maximum junction temperature. When it reaches this temperature, thermal throttling begins to try and keep the CPU core temperature from going any higher. Core i CPUs let you read the value for TJ Max by reading a register within the CPU. This register is fully documented by Intel for desktop and mobile CPUs. The throttling temperature is approximately 98C to 105C for the majority of their recent CPUs but you need to use software like RealTemp or Core Temp, etc. to find out what this value is.

The thermal throttling temperature has nothing to do with the thermal shutdown temperature. There is a signal in the CPU called THERMTRIP. This goes active and forces the CPU to do a thermal shutdown when the core temperature gets approximately 25C higher than the thermal throttling temperature. If the throttling temperature is 100C to 105C then the shut down temperature is not until 125C to 130C.

Asus software like their AISuite II shows more useless temperature information. The sensor being sampled may be 100% accurate but it is so far away from the hottest spot on the core that it doesn't matter what it says. It's just a number. You need to use core temperature monitoring software like RealTemp or Core Temp.

Too bad Intel doesn't hire someone to answer their phones that has actually read some of their documentation. The person you spoke to had about as much useful information about Intel CPUs as the greeter at Wally-Mart has.

As per the Intel temperature guide by Computronix, who knows his shiznit better than just about anybody else around:


4th Generation 22 Nanometer: 4790K (TDP 88W / Idle 2W)

Standard Ambient = 22C
Tcase (CPU temp) = 74C
CPU / Core offset + 5C
Tjunction (Core temp) = 79C
Tj Max (Throttle temp) = 100C

And thermal tripp, which is the absolute max temp at which the system will shut down, is about 15-20°C beyond the Tj Max spec.

don't know if you were responding to my post or not, but the specs you posed from Computronix are basically what i said but your statement "...thermal tripp, which is the absolute max temp at which the system will shut down, is about 15-20°C beyond the Tj Max spec." I believe is incorrect -

only reason i state that, is that i've seen mine throttle at 100C in intel's XTU utility - and continually throttle - temp will fall to 99C, then climb back to 100C and it'll throttle again. Where shutdown is I have no idea, mine never shut down as the throttle kept temps limited to 100C.

 

[Darkbreeze]

Thermal trip is the point at which the system shuts down, in the event that throttling isn't sufficient to reduce temps below Tj Max. For instance, a shorted CPU, a unit where cooling has entirely failed or a grossly overvolted cpu could all be possible situations where throttling does not prevent temps to continue increasing.