is it normal for i3 8100 have higher temp than i5 8400 ?

[gasolina]

I just tested last night and find it very strange that the i3 8100 give me 63*c prime95 while the i5 8400 only 58*c ,theoretically the the i5 have higher clock plus 2 more cores mean it will generate more heat ......

 

[Deleted member 24505]

Same cooler?

 

[gasolina]

yes, i used the cryorig a40 240mm radiator with a pair of noctua industrial fan

after searching google i found this https://www.kitguru.net/desktop-pc/kevin-pocock/pc-specialist-enigma-pro-i3-8100-w-gtx-1070/13/
this also hit 66*C , my environment temp is 29 , also the 8400 temp results around 4x to 5x depends on the cooler and environment temp

 

[kastriot]

And what temps you get if you disable avx extensions(in Prime95!) for both cpus?

 

[Flaky]

i3 has fixed clock.
i5 has turbo, and it's actual frequency is dependent on number of loaded cores and platform configuration regarding turbo itself, power limits, etc.
Doublecheck that the i5 actually runs at reasonably high frequency during test. Prime95 heavily loads the cpu, and that's almost certain that you are not getting 3800MHz allcore turbo (unless you tweaked motherboard settings).

 

[EarthDog]

I just tested last night and find it very strange that the i3 8100 give me 63*c prime95 while the i5 8400 only 58*c ,theoretically the the i5 have higher clock plus 2 more cores mean it will generate more heat ......

Heat and temperature are different things. Both output the same amount of heat (tdp is 65w for both cpus). Temperatures will vary depending on several factors, so yes, it sure can have a higher temp even with less cores and threads.

Think of it this way, which is hotter? A lighter with a yellow flame, or a bonfire with yellow flames? The answer, they are both the same temperature (yellow flame(s)) but clearly the bonfire has more heat energy.

 

[gasolina]

my specs is
z370i strix
adata 8gb x 2 2666 low profile memory
corsair vs 550w
cpu i5 8400/i3 8100/i7 8700k
the picture above is with the id cooling se 214 pro, i test i3 8100 which is 4 cores , i5 8400 6 cores , i7 8700k ( oc + normal 6c/12t ) and 9900k ( for df most of the time i guess ). i still have some 7700k, 6700k , 7600k but idk will people still use these or not. Will do many test include air, htpc coolers, aio, custom loops and some aio mod into custom

my bios setting is all auto but i remove the power limit

 

[EarthDog]

What are you doing? Like, what is the point?

 

[TheMadDutchDude]

It’s really simple. The i5 has a better mount than the i3 in terms of the IHS to die mating.

 

[EarthDog]

It’s really simple. The i5 has a better mount than the i3 in terms of the IHS to die mating.

That can be one reason.

 

[Vario]

The gap between the metal heat spreader (lid) and the die varies from processor to processor. Some have a big gap, some don't. Your temperatures are perfectly normal. The maximum Intel specified temperature (TJunction) is 100 degrees C.

 

[gasolina]

What are you doing? Like, what is the point?

i intend to open a modding pc or cpu heatsink store.....

 

[Vario]

i intend to open a modding pc or cpu heatsink store.....

Well no need to spend any money or time on cooling, it is perfectly fine for these CPUs to run in the 60s while under artificial load.

 

[EarthDog]

i intend to open a modding pc or cpu heatsink store.....

Wow.. GOod luck with that!

That said, your processes and procedures need to be tightened up a bit. Don't be the blind leading the blind. All of quite elementary questions are asked from an 11 year member about the process/other things... makes me nervous for you.

 

[gasolina]

Well no need to spend any money or time on cooling, it is perfectly fine for these CPUs to run in the 60s while under artificial load.

can i ask what to do when there is motherboard vr thermal throttling , this happen when i oc my 8700k to 4.7 the clock drop to 3.7 then back to 4.7 to keep the heat below 85 degree changing the vrm heatsink should solve this ?

 

[EarthDog]

Airflow around the power delivery area. Better heatsinks. The basics, yes.

What motherboard is doing this? 85C seems low temp for a quality vrm. I also thought vrm throttling knocked it back to 2.8 ghz. Are you sure it's the vrm doing this and not a current limit?

 

[gasolina]

Airflow around the power delivery area. Better heatsinks. The basics, yes.

What motherboard is doing this? 85C seems low temp for a quality vrm. I also thought vrm throttling knocked it back to 2.8 ghz. Are you sure it's the vrm doing this and not a current limit?

z370i strix asus the 85 degree is cpu temperature sorry my typing mistake. First i run into power limit show in intel XTU i go to bios set them to 4095 max all , this motherboard vr thermal throttling happen when i oc or whenever the cpu temp over 80*c ,

 

[EarthDog]

Does xtu show vrm thermal throttling?

The CPU temperature shouldnt cause vrm throttling.

But yeah, point some airflow at it and see if it stops.

 

[gasolina]

Does xtu show vrm thermal throttling?

The CPU temperature shouldnt cause vrm throttling.

But yeah, point some airflow at it and see if it stops.

yes XTU show vrm thermal throttling

 

[EarthDog]

Tiny arse motherboard with MEH VRMs... in presumably a tiny arse case... airflow.

 

[gasolina]

Tiny arse motherboard with MEH VRMs... in presumably a tiny arse case... airflow.

i took pictures above as post #7 a mini bench table room temp is 29 though. Thank you for suggesting the fan cooling the clock is stable now

 

[EarthDog]

29C ambient? Heh, that doesnt help at all. Most reasonable room temps are 22-23c. So you are already have an uphill battle.


I'd wait sometime to start your business...you have a lot to learn.

 

[eidairaman1]

It boils down to ihs and die quality and what heat transferring material is used between the die, IHS and HSF.

Remember core i3s are defective core i5/7s.

 

[gasolina]

29C ambient? Heh, that doesnt help at all. Most reasonable room temps are 22-23c. So you are already have an uphill battle.


I'd wait sometime to start your business...you have a lot to learn.

actually i'm in saigon south vietnam temperature here is quite high compare to EU or america , normally around 33-36 degree and not so many people use air conditioning though. I have few months to test around and learn more .

It boils down to ihs and die quality and what heat transferring material is used between the die, IHS and HSF.

Remember core i3s are defective core i5/7s.

oh........this remind me of amd phenom 2 3 cores

 

[Flaky]

Remember core i3s are defective core i5/7s.

With few exceptions aside, this is simply not true.

Up to 7th gen, i3s used 2 core die, and i5/i7s used 4 core die.
8th gen i5/i7 use 6 core die (U0). 8th gen i3s use 4 core die (B0 - the same thing as 7th gen i7/i5s were).

Only recently - due to intel's cpu shortages - we can find on MB support pages that some specific i3/pentium models might come in U0 flavor.
But, since OP's i3 cpuid is 906EB, it is B0 die - the full, non-defective 4 core.