Delided temperatures, are they real?

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ubiquityman

ubiquityman

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Aug 30, 2017
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I've seen online where the read temperature can be 20'C lower with a delided CPU.

My initial reaction was "is that real?"

In other words, is it just reading 20'C lower, or is the die really 20'C lower?

Does anyone know where the CPU thermistor is? Does removing the IHS affect how this thermistor reads temperatures at all? i.e. is the IHS involved with the accuracy of the thermistor reading or is the termistor in the CPU die?
 
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chemmajorp53
The CPU temperature is measured from inside the Die by resistance as far as I know, so it's pretty accurate most of the time. Delidding can lower your temperatures by 20C, but it's going to vary based on which processor you have, how much voltage you're putting through it, etc. If you have an i5 7400 (which doesn't use a whole lot of power) on a hyper 212 then maybe your load temps go from 60C to 55C. However, if you have a 7700K at 1.3V on a 280mm AIO, then it's 100% possible for your load temp to decrease by 20C because the heat buildup between the IHS and die becomes more pronounced when heat has to be removed that much faster. The idle temp will probably stay the same. I delidded my 4670k and I saw about 12-14C improvement under load.
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chemmajorp53

chemmajorp53

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Apr 5, 2013
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The CPU temperature is measured from inside the Die by resistance as far as I know, so it's pretty accurate most of the time. Delidding can lower your temperatures by 20C, but it's going to vary based on which processor you have, how much voltage you're putting through it, etc. If you have an i5 7400 (which doesn't use a whole lot of power) on a hyper 212 then maybe your load temps go from 60C to 55C. However, if you have a 7700K at 1.3V on a 280mm AIO, then it's 100% possible for your load temp to decrease by 20C because the heat buildup between the IHS and die becomes more pronounced when heat has to be removed that much faster. The idle temp will probably stay the same. I delidded my 4670k and I saw about 12-14C improvement under load.
 
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ubiquityman

ubiquityman

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Thanks for the note. I'm using a 7820X (140W TDP) with Nepton 280 (water cooler). It overclocks quite easily and well. A real 20'C drop is huge, so I will attempt to delid sometime in the near future.
 
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chemmajorp53

chemmajorp53

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The most noticeable thing I saw after delidding was that all the cores were within a few degrees of each other. I used to have one core at 80C while all the others were at 65-70, which bothered me a bit. I didn't even do it the "right way" with liquid metal, just used Noctual NH-T1 and the floating IHS method. Works a lot better than that rubberized crap Intel ships their CPUs with.

EDIT: Just saw your note, if you're not familiar with delidding I might look into having a professional do it. Saving $30-40 isn't worth the chance of bricking a $700 CPU in my opinion.
 
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JackNaylorPE

JackNaylorPE

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1. Unless you have a custom loop, w/ high end water block like the EK Supremacy, I wouldn't invest the time, money, risk and effort. Make sure to use a delidding tool specifically designed for your CPU.

2. As with GPUs which peeps still seem anxious to water cool even when it brings no performance gains, it must be recognized that "extra cooling" doesn't deliver anything but bragging rights. If you have a self imposed limit under stress testing of 80C and you stopped at 78C because you hit the voltage wall, then getting 76C, 70C or even 50C isn't bringing anything to the table.

Let's remember the reason Intel switched to the cheaper process is because, in their view, spending more money wasn't delivering any performance improvements... in most cases, they're right.
 
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ubiquityman

ubiquityman

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Thanks, I hear ya.... i.e. 'make sure there is a problem to solve before delidding'.
The Nepton 280 has been super effective. Even at high overclock, I can keep temps just over 60'C but the fans get quite noisy. Lower temps would help reduce the fan noise. Whether that's worth the delidding risk, I'm not sure yet.
 
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