Jump to content

does TDP directly correlate with CPU temp?

ie, since the TDP of the 3570k is lower than the new skylake cpus (by around 20 tdp, 75 vs 95 i think?), does the skylake cpu running at stock run hotter than a 3570k?

Link to comment
Share on other sites

Link to post
Share on other sites

TDP = Thermal Design Power

so yes but there are other things that must be taken into account like the voltage regulators being removed from the chip (thats a thing right) and thermal interface

Thats that. If you need to get in touch chances are you can find someone that knows me that can get in touch.

Link to comment
Share on other sites

Link to post
Share on other sites

ie, since the TDP of the 3570k is lower than the new skylake cpus (by around 20 tdp, 75 vs 95 i think?), does the skylake cpu running at stock run hotter than a 3570k?

No, TDP is just a measurement of the heat output, how effectively the heat gets "cooled"(removed is a better term) is what determines temps. Here are a couple examples: 

  • Core i3(65w TDP) on stock cooler vs FX 8550(125w TDP) on watercooling. The i3 will run at 60-70c in most cases, however the FX will run at 50-60c under water, so despite the lower TDP its not being cooled as efficiently as the watercooling.
  • Then the extreme: Any desktop CPU(lets even assume up to 220w TDP) with any cooling vs Dell Inspiron 11(7-14w TDP). Last I checked PC's running at 90c+ is bad, however its "normal" for the Inspiron. How does the 14w Inspiron kick out a wicked amount of heat? It doesn't remove the heat efficiently.
Link to comment
Share on other sites

Link to post
Share on other sites

 

No, TDP is just a measurement of the heat output, how effectively the heat gets "cooled"(removed is a better term) is what determines temps. Here are a couple examples: 

  • Core i3(65w TDP) on stock cooler vs FX 8550(125w TDP) on watercooling. The i3 will run at 60-70c in most cases, however the FX will run at 50-60c under water, so despite the lower TDP its not being cooled as efficiently as the watercooling.
  • Then the extreme: Any desktop CPU(lets even assume up to 220w TDP) with any cooling vs Dell Inspiron 11(7-14w TDP). Last I checked PC's running at 90c+ is bad, however its "normal" for the Inspiron. How does the 14w Inspiron kick out a wicked amount of heat? It doesn't remove the heat efficiently.

 

 

 

i think the word you're looking for is dissipate 

Link to comment
Share on other sites

Link to post
Share on other sites

No, it correlates to heat output.

 

If you have a low TDP chip, and a low TDP rated cooler on it, then the cpu will be of an, average temperature.

If you have a high TDP chip, and a low TDP rated cooler on it, then the cpu will be hot.

If you have a high TDP chip, and a high TDP rated cooler on it, then the chip will be cool/average.

 

A chips temperature is determined by how well the cpu heatsink performs.

Updated 2021 Desktop || 3700x || Asus x570 Tuf Gaming || 32gb Predator 3200mhz || 2080s XC Ultra || MSI 1440p144hz || DT990 + HD660 || GoXLR + ifi Zen Can || Avermedia Livestreamer 513 ||

New Home Dedicated Game Server || Xeon E5 2630Lv3 || 16gb 2333mhz ddr4 ECC || 2tb Sata SSD || 8tb Nas HDD || Radeon 6450 1g display adapter ||

Link to comment
Share on other sites

Link to post
Share on other sites

i think the word you're looking for is dissipate 

Remove, dissipate, same thing. Its all a part of a process...

 

CPU creates heat, heatsink removes/transfers it from the CPU, the heatsink dissipates it into the air(or other medium). Talking about the dissipation process is more of a discussion for the heatsink itself rather than the energy transportation from the CPU to the heatsink.
Link to comment
Share on other sites

Link to post
Share on other sites

ie, since the TDP of the 3570k is lower than the new skylake cpus (by around 20 tdp, 75 vs 95 i think?), does the skylake cpu running at stock run hotter than a 3570k?

On the same cooler, under the same load, with the same thermal conditions (such as ambient temp), yes. 

 

A higher TDP means it puts out more heat. If you're only dissipating a fixed amount of heat, the chip with the higher TDP will be hotter.

"Rawr XD"

Link to comment
Share on other sites

Link to post
Share on other sites

Also I should note that many Intel chips don't actually consume anywhere near their tdp under load at stock speeds. They use broad tdp brackets for segments of their lineup.

Finally tdp also assumes you are running the igpu which is much improved from the 3570k to the 6600k (but yet probably takes more power as well).

LINK-> Kurald Galain:  The Night Eternal 

Top 5820k, 980ti SLI Build in the World*

CPU: i7-5820k // GPU: SLI MSI 980ti Gaming 6G // Cooling: Full Custom WC //  Mobo: ASUS X99 Sabertooth // Ram: 32GB Crucial Ballistic Sport // Boot SSD: Samsung 850 EVO 500GB

Mass SSD: Crucial M500 960GB  // PSU: EVGA Supernova 850G2 // Case: Fractal Design Define S Windowed // OS: Windows 10 // Mouse: Razer Naga Chroma // Keyboard: Corsair k70 Cherry MX Reds

Headset: Senn RS185 // Monitor: ASUS PG348Q // Devices: Note 10+ - Surface Book 2 15"

LINK-> Ainulindale: Music of the Ainur 

Prosumer DYI FreeNAS

CPU: Xeon E3-1231v3  // Cooling: Noctua L9x65 //  Mobo: AsRock E3C224D2I // Ram: 16GB Kingston ECC DDR3-1333

HDDs: 4x HGST Deskstar NAS 3TB  // PSU: EVGA 650GQ // Case: Fractal Design Node 304 // OS: FreeNAS

 

 

 

Link to comment
Share on other sites

Link to post
Share on other sites

Specs for 3770k are TDP=77W, Tcase 67.4C and Tjmax 105C. TCC activation is at 105C and is designed to keep Tcase within spec at 77W. So Tjc = (105-67.4)/77 = 0.488C/W.

Unfortunately Intel does not publically supply Tcase for the 6700k so if Techinferno's spec of Tcase = 72C is correct then Tjc = (100-72)/95 = 0.295C/W

For example a cooler and TIM thermal resistance of 0.2C/W and local ambient temp of 35C then

i7-3770K Tja = ((0.488+0.2)*77)+35 = 88C

i7-6770K Tja = ((0.295+0.2)*95)+35 = 82C

So in this case the 6770K runs cooler even though it's using more power.

 

Edit: Found the Intel spec, techpowerup is wrong. Some changes as well, a 95W TDP with 130W cooling is rated at 91W TDP while a 65W TDP with 65W cooling is rated at 47W TDP.

 

So i7-6700K Tja = ((0.395+0.2)*91)+35 = 89C

Link to comment
Share on other sites

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×