does the i7 4790k really run cooler then a i7 4770k ?

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orndorf

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Apr 21, 2014
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I had a i7 4770k and I now have a i7 4790k . my i7 4770k ran 5c cooler then my i7 4790k at the same voltage . is this normal ? because I hear a lot of talk about i7 4790k's running cooler then the i7 4770k and I just don't see it .

I wound up deliding my i7 4790k using coollaboratory liquid pro and my temperatures are great now . I just don't get how intel can advertise that the i7 4790k runs cooler then the i7 4770k and it does not unless you delid it
 
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JackNaylorPE
The 4790k has an 88 watt TDP / the 4770k has an 84 watt TDP.

So while that says the 4790k should be hotter, It's all about "Delta T"

These aren't actual numbers but to give ya an idea. As the only change is inside the CPU, everything else is the same

Staring with CPU cores of 75C
Delta T of 10C thru internal CPU TIM (and gaps) means surface at 65C
Delta T of 3C thru external CPU TIM means surface of Cooler at 62C
Delta T of 5C thru Cooler base and pipes means surface of fins at pipe connection at 57C
Delta T of 25C thru Cooler fins at pipes means surface of fins where air passing over them at exit is at 32C

Now with the better TIM, whatever those actual numbers are in the last 4 lines is immaterial. If the 1st line changes from...
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It's not "cooler"
It simply dissipates heat better.
The TIM simply transfers heat to the metal plate, and a better one will simply make the CPU cooler, but the shield will be much hotter.
That is why the clocks can reach such a level, with the same temperature, since the cooler is removing more heat.
 
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I have a decent chip I am stable @ 4.7ghz with 1.28v under full load . I am just complaining because I had to delid my chip . before deliding my chip @ 4.7ghz @ 1.28v my max temp was 83c when running occt now after deliding my chip my max temp is 67c when running occt . I have a corsair h100i
 
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I checked out the link you posted . it is showing the i7 4790k running cooler then a i7 4770k

 
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so you are telling me that the TIM on the 4790k is better . but then why where my temps at the same voltage better on my i7 4770k ?
 
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yes I did run the same stress test and my temps were better on my i7 4770k at the same voltage . is it possible something is wrong with my corsair h100i ?

 
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Like I said, the better TIM means the CPU itself will be cooler, but that metal plate shielding it will be hotter, which is why the CPU also reabsorbs heat from the plate, and in conclusion is hot again.

 
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My mistake, You're correct... What i meant to say 😛 Hope the article helped you out a bit
 
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so it is normal for the temperatures to be hotter on a i7 4790k then a i7 4770k ?

 
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Depends on how good your cooler is for taking out all that extra heat created by the 4790k's high clock speed.
If you use a good cooler, it'll be a few degrees lower than an average 4770k.
If you use the stock fan or something, it'll run pretty hotter than a 4770k.
 
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the cooler I am using is a corsair h100i
 
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what is your cpu core ratio and voltage under full load in cpu-z ? and what do you consider normal use ? did you try running aida64 ?

 
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yes, on average.....the silicon lottery means that there will be exceptions.

EDIT: Read that last post too quickly ..... What I meant to say was that as I said above;

The 4790k should run cooler than the 4770k simply because it can move heat from the cores to the heat sink faster.
Click to expand...

However .... the silicon lottery is such that there will be exceptions. On average the 4790k will be significantly cooler than the 4770k but a bad luck 4790k can run hotter than a good luck 4770k.





 
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Erm, no. The i7 4790k runs cooler than the i7 4770k on average. Read countless reviews.
 
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yes, that's exactly what I said in my original post .... I phrased it wrong in the last one tho, thanks for pointing it out....will edit to correct. See EDIT 2 posts up.


 
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Well yeah, since the TIM moves heat better from the cores to the shield, it SHOULD mean the CPU is cooler.
But if the cooler isnt doing a very good job at taking that extra heat, them obviously the heat will just go back to the CPU.
 
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It's all about Delta T ..... The Delta T between internal temps and surface temps of the CPU was larger with 4770k .... reduce that and the CPU surface gets hotter. Then there's a delta T thru the TIM, reduce that and the cooler gets hotter but we can assume here it is the same if same TIM is used.

So if the surface is hotter, the TIM will be hotter, the Cooler bottom plate will be hotter and therefore the cooler fins will be hotter. The delta T between the cooling air and the fins will now be greater so the cooler will actually be more efficient and remove more heat faster with the 4790k.
 
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I think to an extent the 4790k is a victim of its own success. It's clocked so high and the good Tim that intel has used when combined with speed step voltages have meant that people can get away with really bad mounting. After my evga z97 was DOA I became paranoid and asked a shop to re do my build (this was a mistake) using artic silver 5 and a h100i with extra washers on the back I thought occt was lying when it rocketed up to 100.C when I re mounted with a sma thin line of Arctic 5 and lots of mounting pressure I was down to 68 on the prime95 torture test and an idle temp of 28.
With the h100i I would recommend using about 3mm of washers on the back plate and make sure it's oriented with the cut out at the top (the shop screwed up in this too). I also decided to tint the h100i heat sink first too and then used a thin line of paste from top to bottom. One other thing holding me back was my gigabyte bios which gave the cpu 1.47V this was addressed in an update. Many people say I should reduce it from 1.27 to 1.24 but I've left it and still don't go over 70.C
 
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A 4790K is basically a 4770K chip, with that better TIM and more capacitors, and clocked higher.
The 4790K gives off more heat than a 4770K cause of the higher clock and higher wattage, BUT since the TIM works especially well, the metal plate covering the CPU is hotter than the metal plate on the 4790K.
So how is it cool?

Since the TIM heats up the metal plate hotter than a 4770K, IT MEANS that in the reverse side, the 4790k is cooler than the 4770k because all the excess heat it generates is all moved to the plate, which the cooler...cools.
If you left the 4770k and a 4790k without coolers, I'm sure the 4790K would blow first.
But since the better TIM means better heat transfer to the CPU cooler, the chip in turn is cooler.
 
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The 4790k has an 88 watt TDP / the 4770k has an 84 watt TDP.

So while that says the 4790k should be hotter, It's all about "Delta T"

These aren't actual numbers but to give ya an idea. As the only change is inside the CPU, everything else is the same

Staring with CPU cores of 75C
Delta T of 10C thru internal CPU TIM (and gaps) means surface at 65C
Delta T of 3C thru external CPU TIM means surface of Cooler at 62C
Delta T of 5C thru Cooler base and pipes means surface of fins at pipe connection at 57C
Delta T of 25C thru Cooler fins at pipes means surface of fins where air passing over them at exit is at 32C

Now with the better TIM, whatever those actual numbers are in the last 4 lines is immaterial. If the 1st line changes from Delta T of 10C to a Delta T of 3C, then CPU temps will drop by 7C ... less about 5% for the extra 4 watts, so 6.7 C

You can read about this in detail here:

http://www.extremetech.com/computing/185512-overclocking-intels-core-i7-4970k-can-devils-canyon-fix-haswells-low-clock-speeds/2

But in the end it turns out that it doesn't mean a lot..... while it's nice that Intel bowed to pressure and gave the people what they wanted, in the end while temps are lower, overclocks are not increasing substantially as voltage rather than temps is most often the limiting factor. The article concludes that your chances of getting a 5 Ghz chip "on air" has gone up from a fraction of 1 % to 5%. From looking around at various reviews and tracking sites, typically instead of the 4.5 - 4.6 Ghz most peeps got on 4770k with excellent cooling, with the 4790k, ya probably looking at 4.6 - 4.7 Ghz
 
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