[SOLVED] Questions about CPU frequencies

[AMT11]

Hello

I have a few questions about the i5-11400 processor:

The base frequency of this processor is 2.60 GHz and the turbo frequency for only one core is 4.40 GHz. But the turbo frequency of all cores when working together is 4.20 GHz.

Now in many software the single core frequency is important and my questions are in this regard.

1. In this processor, is the single-core frequency considered 2.6 GHz or 4.4 GHz?

2. How many seconds or minutes can the Turbo frequency stay on a single core at 4.4? Assuming it is needed. For example, if needed, can it stay at 4.4 GHz for an hour or more?

3. Suppose we are doing heavy rendering. Do you think all cores run at 4.2 GHz all the time rendering?

4. The processor is based on the base frequency of 2.6 and turbo 4.4. Do you think that if this processor was based on the base frequency of 3.6 and turbo 4.4, it would have an effect on single-core performance? Because in both cases, the frequency of the single-core turbo goes to 4.4 GHz. However, I do not know if the value of the base frequency really matters, and assuming that the turbo frequency in the single core and the turbo frequency in all cores are the same, does the base frequency affect performance? What percentage is effective?

5. Suppose we are doing rendering. Do you think CPU cores are involved one by one or all cores together and equally? For example, the first core starts working when its capacity is full, the second core also enters into operation, and so on until the end, or the rendering operation is spread on all cores, assuming that at the beginning 30 or 40% of all cores are involved in processing. If necessary, the percentage of involvement of all nuclei together will increase to, for example, 90%.

Thank You

 

[rgd1101]

1)2.6 to 4.4. depend on temp and power usage
2)30-60seconds, need to find detail
3)no
4)yes. most of the time it run on base freq
5)no, not unless you working on some old and badly written software. it will spread out

 

[punkncat]

Your question is very technical and there is a lot to it based not only on the CPU, but the motherboard manufacturers adherence to Intel's "power management rules" (I think they actually call that something else P state maybe?), as well as temperatures, power delivery ability of the board as compared to the CPU...I mean, there really is a lot to it.

In addition to running at 2.6-4.4, it can also run less than that when under light load, multi threaded load, and so on.
Really hoping someone more technical will chime in, but the max boost isn't going to stay that way on a permanent level unless you change that parameter in BIOS. Even while in that timer, the boost can be lowered by the temperature and power use.

Even that same CPU can act and perform completely different based on the motherboard it's in. It is likely not to perform as well on a B series chipset with poor power delivery, as it would in a really nice Z series with good power delivery.

 

[RodroX]

Hello

I have a few questions about the i5-11400 processor:

The base frequency of this processor is 2.60 GHz and the turbo frequency for only one core is 4.40 GHz. But the turbo frequency of all cores when working together is 4.20 GHz.

Now in many software the single core frequency is important and my questions are in this regard.

1. In this processor, is the single-core frequency considered 2.6 GHz or 4.4 GHz?

2. How many seconds or minutes can the Turbo frequency stay on a single core at 4.4? Assuming it is needed. For example, if needed, can it stay at 4.4 GHz for an hour or more?

3. Suppose we are doing heavy rendering. Do you think all cores run at 4.2 GHz all the time rendering?

4. The processor is based on the base frequency of 2.6 and turbo 4.4. Do you think that if this processor was based on the base frequency of 3.6 and turbo 4.4, it would have an effect on single-core performance? Because in both cases, the frequency of the single-core turbo goes to 4.4 GHz. However, I do not know if the value of the base frequency really matters, and assuming that the turbo frequency in the single core and the turbo frequency in all cores are the same, does the base frequency affect performance? What percentage is effective?

5. Suppose we are doing rendering. Do you think CPU cores are involved one by one or all cores together and equally? For example, the first core starts working when its capacity is full, the second core also enters into operation, and so on until the end, or the rendering operation is spread on all cores, assuming that at the beginning 30 or 40% of all cores are involved in processing. If necessary, the percentage of involvement of all nuclei together will increase to, for example, 90%.

Thank You

It all depends as others wrote already. It depends on your motherboard and BIOS settings, there are decent B560 and Z590 mobos, and really horrible ones (power delivering wise), some mobos don't folow intels guidelines and make the CPU turbo last longer.
It will also depend on your cooling solution and how good is the airflow inside your case. If you are going to use it for rendering then a decent aftermarket unit should be on your buying list (make sure is compatible with the cpu, the mobo and your case)


1.Single core frecuency refers to the frecuency that a single core run. You can have one core boosting to 4.4 GHz while the others are runing at 2.6GHz. Or you can have all cores "sitting" at 2.6GHz while youre doign basic stuff with the system. Heck you can have all core using different frecuencies depending on the load.

The term "all core" max frecuency refers to the theoretical max frecuency all cores can run at the same time. Once again it will depend on your Mobo, Power Limits configuration in BIOS, and your cooling solution.

2. On your question I think with power limits enable (intel's way) is 28 seconds, then it will run slower.

3. No, they will run at 4.2GHz but for only 28 seconds (with power limits enable), then they will run slower.

4. A highest base frecuency (and if max boost is the same) should yield to better performance if power limits are in place.

5. The render workload distribution will depend on what you are rendering and what software is been used. Some apps handle workload distribution better than others (some, not many don't support more than 1 core) and some tasks you perform may just use 1 core.

Lets not forget that a decent PSU it also need it for any system but even more if you are thinking about removing the power limits. This is not because of how high the load is, but because you need the power delivering to be stable and reliable.

 

[AMT11]

It is assumed that a good motherboard is used, for example, a very good model B series or Z series. Also, there are no restrictions on the CPU on the motherboard, and the CPU can use its full capacity. Also, very good power is used and the required electricity is supplied. I just want to know the mechanism of the CPU when there are no restrictions on hardware or software. For example, the software has the ability to use 6 cores and 12 brittle simultaneously. Please answer the questions with these assumptions.

 

[RodroX]

It is assumed that a good motherboard is used, for example, a very good model B series or Z series. Also, there are no restrictions on the CPU on the motherboard, and the CPU can use its full capacity. Also, very good power is used and the required electricity is supplied. I just want to know the mechanism of the CPU when there are no restrictions on hardware or software. For example, the software has the ability to use 6 cores and 12 brittle simultaneously. Please answer the questions with these assumptions.

If you have a decent mobo, power supply cooler, and you remove the power limits, then if you hit the CPU with a workload that can use its 12 threads simultaneously it should stay close to 4.2GHz for as long as the workload last. The same applies to the one core max frecuency, it will remain close to the 4.4GHz as long is it has a workload to work with.

But keep in mind that doing this will void your warranty, because this is not how intel "designed" the CPU to work.

Another thing to keep in mind is that for example a Ryzen 5 5600X at stock settings (stock means no need for strange vooodo, fancy coolers, expensive mobos or similar) will be able to match or exceed the performance of the core i5 11400 with it power limits disable. And I bet similar thing can happend with a Ryzen 7 3700X or a Core i7 10700.

So for me its not as easy as I will buy big mobo, psu and cooler and remove power limits and be done with it.

Cheers

 

[AMT11]

5)no, not unless you working on some old and badly written software. it will spread out

Explain more if possible

 

[SamirD]

Explain more if possible

Software that is designed for multiple threads and cores will almost always operate this way, spreading the load evenly and continuously. Software that is not optimized in this way, may be clunking on how it chooses and uses threads/cores and may not use them optimally.

 

[AMT11]

4)yes. most of the time it run on base freq

In your opinion, if the single-core frequency is important to someone, it is better to buy a processor that has scored more points in the benchmarks and in the single-core, or to buy a processor that has a higher base frequency, because you said that most of the time the processor works on the base frequency. But in benchmarks, turbo frequency performance may not really show real results in long-term rendering.

 

[rgd1101]

why not both, higher based freq and good benchmarks.

 

[RodroX]

In your opinion, if the single-core frequency is important to someone, it is better to buy a processor that has scored more points in the benchmarks and in the single-core, or to buy a processor that has a higher base frequency, because you said that most of the time the processor works on the base frequency. But in benchmarks, turbo frequency performance may not really show real results in long-term rendering.

You know, it wil be easier and faster to answer your questions if you share with us:

1. What software are you going (or want) to use with this CPU? and...
2. If you are doing this "work" professionally and you want to make money and make a leaving out of it? and...
3. Whats the budget for the CPU?, Or Whats the budget for the whole PC (will this money include the displays, keyboard and mouse or only the PC)?
4. Where are you in the world?

And If you think theres something else you can tell us to clear out whats really going on with this CPU, please do.

There are no really bad answers buying a CPU this days. What can make the difference is the amount of money you need to spend trying to make that cpu work its best in your system.

Cheers

 

[Zerk2012]

Hello

I have a few questions about the i5-11400 processor:

The base frequency of this processor is 2.60 GHz and the turbo frequency for only one core is 4.40 GHz. But the turbo frequency of all cores when working together is 4.20 GHz.

Now in many software the single core frequency is important and my questions are in this regard.

1. In this processor, is the single-core frequency considered 2.6 GHz or 4.4 GHz?

2. How many seconds or minutes can the Turbo frequency stay on a single core at 4.4? Assuming it is needed. For example, if needed, can it stay at 4.4 GHz for an hour or more?

3. Suppose we are doing heavy rendering. Do you think all cores run at 4.2 GHz all the time rendering?

4. The processor is based on the base frequency of 2.6 and turbo 4.4. Do you think that if this processor was based on the base frequency of 3.6 and turbo 4.4, it would have an effect on single-core performance? Because in both cases, the frequency of the single-core turbo goes to 4.4 GHz. However, I do not know if the value of the base frequency really matters, and assuming that the turbo frequency in the single core and the turbo frequency in all cores are the same, does the base frequency affect performance? What percentage is effective?

5. Suppose we are doing rendering. Do you think CPU cores are involved one by one or all cores together and equally? For example, the first core starts working when its capacity is full, the second core also enters into operation, and so on until the end, or the rendering operation is spread on all cores, assuming that at the beginning 30 or 40% of all cores are involved in processing. If necessary, the percentage of involvement of all nuclei together will increase to, for example, 90%.

Thank You

This might help a bit the speed really depends on several factors.
https://www.guru3d.com/articles-pages/intel-core-i5-11400f-processor-review,2.html

1. Both depending on the load if your just like surfing the web their really no reason to jump to turbo speed although it will do it back and forth.
2. Always if the core load is their. Again depending on the temp and if another part of the PC is slowing the CPU speed because it's waiting on data to process.

3. yes as long as you don't thermal throttle or the processor is waiting on data from the drive or something.
4 the base speed of 2.6 if that is correct (I did not look it up so taking you word on the base speed) is when nothing is taxing the CPU although as in answer 1 they still jump around in speed even with nothing really going on.

5. No real answer to this. if your program can use all the cores then they all will be used if they run 100% it gets a bit more complicated if your slowest part of your PC doing that task is another part then no.

 

[AMT11]

why not both, higher based freq and good benchmarks.

Hi

Which CPU do you think has both?

If possible, introduce a 6-core processor and an 8-core processor that have both.