Suddenly: Core i9-9900K so cool just because Intel decided to cheat

Recently, Intel released the Intel Core i9-9900K. The top eight cores with a frequency of 5 GHz to an impressive and originally very expensive even with the official price tag. About the real cost at the moment, I do not say anything.

So, here I have already introduced you to the first at that time tests this CPU. In particular, I noted very high CPU consumption. Let me remind you, Core i9-9900K under load consumes 30-50 watts more than the Core i7-8700K, although the value they have the same TDP of 95 watts.

Yes, the TDP does not indicate the real power consumption. Moreover, the modern budget CPU Celeron and Pentium (full, not “atomic”) consume much less than prescribed in the TDP. In the case of Core i9-9900K all the way around.

The question arose, how is it, exactly? Why at identical TDP novelty eats, not in itself, in comparison with the last top? It turned out, the answer is quite amusing.

So, first entry. Any modern Intel CPU (AMD system is approximately the same) can operate in a particular frequency range. For the same Core i9-9900K, which is 3.6-5.0 GHz. But, I think you all know that these values are relative. The first indicates the minimum frequency, which must reach the CPU when loading all cores (although in the mobile segment, as shown by the new Intel shestiyaderny, this condition is not already running) and the second maximum frequency to be achieved by the CPU under load only on one core.

It is easy to guess that in most real tasks, the frequency will be somewhere in the middle between the conditional extreme values. Limit values for each CPU are determined by the table of frequencies Turbo Boost technology. Here, for example, the table for some of the models eighth generation.

But you need to understand that these values are the maximum possible. In reality, as modern graphics cards, frequency overall, and for each set of loaded cores in particular, are regulated by the power limit. This is conventionally the same TDP.

Explain for better understanding. Take a couple processors: Core i7-8700K and Core i7-8700T. They have the same number of cores both have support for HT, and generally it is two absolutely identical piece of silicon. But the first TDP — 95 W, and the second is only 35 watts, that is almost three times lower. As you can see in the table above, the difference is not only in the extreme frequencies, but the frequencies for a specific number of loaded cores. For example, when loaded with only three cores, Core i7-8700T can work a maximum of 3.9 GHz, whereas the Core i7-8700K frequency is 4.5 GHz. Often values are selected so that in either mode the processor is relatively speaking not go beyond your limit power. But in our case, it is not so.

That is, make a Subtotal. We have a table of frequencies Turbo Boost, which shows maximum frequency for a given number of loaded kernels, and thus there is a limit of power that must fit the processor. If the limit is high enough, the CPU will work on those frequencies that are listed in the table. If the limit is insufficient, the frequency will be lower than the maximum.

I think it’s pretty clear. Now let’s go further. Core i7-8700K with its TDP of 95 watts under load, consumes just about the same. Of course, application-dependent, but conditionally it fits into your limit. Let me remind you, he’s got six cores and a frequency of 3.7-4.7 GHz. All six cores can work a maximum of 4.3 GHz. And now take Core i9-9900K. He has eight cores and a frequency of 3.6-5.0 GHz, and Intel promises that all eight cores can run up to 4.7 GHz. And TDP is the same. Magic? No, deceit or even false.

Here we come to the climax directly. So, the guys from TechSpot found that Core i9-9900K on any system Board, which they have been running out of its power limit. Simply put, Intel, together with partners, untied his “hands”, not limiting it thereby TDP of 95 watts. This was done precisely in order for the processor to work on all possible frequencies to maximize results. Without the transition to 10-nanometer standards Intel simply could not create such a productive eight-core processor, holds up to 95 watts.

They decided to test what would happen if I had to limit the CPU its official TDP. And that’s what happened.









 

As you can see, the gap in performance is quite significant. Now the Core i9-9900K not everywhere ahead of Ryzen 7 2700X, and if ahead of, it is often negligible. But they have a gap in price, even officially. And if not officially, then for the current European price of the Core i9-9900K you can buy two top Ryzen and will remain for two top-end air cooling.

And what happened to the temperatures and power consumption?


The temperature dropped just incredible, and the energy consumption was even lower than the six-core Core i7-8700K!

The results in the games I will not show yourself, you can look at the source. Do not show, because the difference is often either not at all or it is minimal.

And now the overall result. What to do and how to treat? Well if we are talking about ordinary users, and there is nothing in any way. Most simply don’t care what the limits are, why the CPU is works so how it works is that problems with the heating affect everyone but people just consider them when choosing a CPU. If to speak about us, who are interested in these issues more deeply, who write the news and who prefers to understand the details (I intentionally did not use the word “geek”), one can conclude on the basis of the information provided in this material. Actually we are cheating by Intel, since it pointed very far from the reality of the power limit. But on the other hand, we got really very powerful processor, which for most is much more important. You can tell that he works out of the box in overclocked mode.

What do you think? Correctly received Intel?

0 Comments on “Suddenly: Core i9-9900K so cool just because Intel decided to cheat”

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