[SOLVED] i5 8400 settings

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hifinoob

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Jun 12, 2016
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Hello,

How can I configure the i5 8400 for maximum performance?
System board: ASUS TUF B360-Plus Gaming
Ram: 2x 8Gb 2133mhz DDR4
Gammaxx 300 CPU Coller
Latest Bios.
Win 10 x64.

I tried a few settings and none of the cores go above 3.8 Ghz. I understand that one core can go to 4 Ghz, or 2 at 3.9 Ghz.

Does EIST reduce performance? If I set it to stay at 3.8 Ghz the voltage on the CPU is 1.2. Temperatures in 6 core benchmark sit at ~60 degrees, but 1.2 seems a bit much.
 
Solution
H
I managed to get it to x40 on a single core in idle and load.
1st picture idle, you can see cores clock and cores ratio go to x40/~3920MHz. Uncore goes to x37/~3690MHz.
2nd picture Core 0 is at 100%.
https://imgur.com/a/p3sbQ5h#tWGqrM4
In idle all the cores go to x40 very easily, in load the one core achieves x40 sporadically.
Some software will prevent the cores to go to x40 in idle or load, even if they are open and do nothing: Intel XTU, SpyHunter 5.


It needs to be on full load on one core and idle on the rest:
OCCT can assign itself to one core (with one thread).
Prime 95 (cpu stress) needs to be assigned to one core via Task Manager. Needs one or two threads, six will crash it.
CPU Burner will not get the core to x40 regardless...
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H

hifinoob

Honorable
Jun 12, 2016
78
1
10,565
It's locked, but I don't want to overclock it, I just want to get the Turbo Boost as per Intel's specifications:
4,000 MHz (1 core),
3,900 MHz (2 cores),
3,900 MHz (3 cores),
3,900 MHz (4 cores),
3,800 MHz (5 cores),
3,800 MHz (6 cores)

It has never gone over 3.8Ghz. Do I have to change the multiplayer manually from BIOS?
 
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hifinoob

Honorable
Jun 12, 2016
78
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10,565
Went through wall the bios settings.
Tried setting one core at 40 multiplier, the others at auto.
Maxed out all the settings, still nothing.

Does anyone with an 8400 can confirm if it can actually go to 4gh?
 
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hifinoob

Honorable
Jun 12, 2016
78
1
10,565
From Intel XTU:
https://imgur.com/a/iddh6tV

This platform does not support overclocking
Max core frequency 3.78ghz.
Procesor cache frequency 3.49ghz.
Power limit throteling- No.
Range - No - Yes.
Thermal throteling- - same as power limit.
Current limit throteling- - same as power limit.
System board VR - - same as power limit.

In the comparisons page on the website , besides the others having z370 boards, the Turbo Boost Power Max was increased.
Should I attempt to raise it as well?

Ran stress test on one core, stayed at x38 multiplier.

Disabled 5 cores from BIOS, here's what I got:
1x sits at 4000mhz, x40 multiplier.
Uncore is at 3700, x37 multiplier.

Disabled 4 cores in BIOS:
2x cores - 3900mhz, x39 multiplier.
Uncore is 3600mhz, x36 multiplier.
Tried setting the multiplier x40 for the 1st core, the 2nd left to auto, ran stress test on one core. No change.
4x cores, same as 2.

Intel speed step is disabled.
Intel speed shift is enabled.
ACPI timer is at 3580mhz.
Virtualization is enabled.
Cpu power enhancement is on. Is this the Multi core enhancement?

On 6 cores the Uncore sits at 3500mhz/x35 multiplier. Is this the problem?
 
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H

hifinoob

Honorable
Jun 12, 2016
78
1
10,565
I managed to get it to x40 on a single core in idle and load.
1st picture idle, you can see cores clock and cores ratio go to x40/~3920MHz. Uncore goes to x37/~3690MHz.
2nd picture Core 0 is at 100%.
https://imgur.com/a/p3sbQ5h#tWGqrM4
In idle all the cores go to x40 very easily, in load the one core achieves x40 sporadically.
Some software will prevent the cores to go to x40 in idle or load, even if they are open and do nothing: Intel XTU, SpyHunter 5.


It needs to be on full load on one core and idle on the rest:
OCCT can assign itself to one core (with one thread).
Prime 95 (cpu stress) needs to be assigned to one core via Task Manager. Needs one or two threads, six will crash it.
CPU Burner will not get the core to x40 regardless of the settings above, with one or more threads.
CPU Z only has one benchmark that gets one core to 100% (Version 17.01.64), but it uses the other cores as well. It resets the assigned cores via Task Manager.


When it goes to x40 the other cores do not go down in frequency as Intel's documentation on this technology claims.
I thought that it was a headroom issue, so I tried power saving and balanced power settings, and while the core frequency did go down in idle, in load the other cores would still go to 3.8/3.9GHz. The one core would still reach 4Ghz with these 2 power settings as well.

I noticed In Intel XTU while 5 cores were disabled in BIOS the Turbo Boost Power Max and Turbo Boost Short Power Max were set to Unlimited. I set them to Unlimited after I enabled all cores, but made no difference. This setting would resets itself after a reboot.

Support told me this is normal CPU behavior, set by Intel.

Also, can monitoring software display Max Core Frequency per core?
 
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