topic Recommended ACLL/DCLL values for Intel Defaults Profile for 14900K processor? in Mobile and Desktop Processors

Recommended ACLL/DCLL values for Intel Defaults Profile for 14900K processor?

SmartOne_2000 — Thu, 17 Oct 2024 18:35:38 GMT

Hi:

Intel guidance says the AC/DC load line values must be identical for the Intel Defaults Profile (IDP).

In my Asus z690 MCE profile, ACLL = 0.4mOhm and DCLL = 1.1mOhm.

What are the Intel's ACLL/DCLL values that were used to test its recommended profile to come to the conclusion that there was hardly a performance hit due to the microcode?

I'm currently getting almost a 20% performance hit between IDP (Extreme) and Asus MCE in Cinebench R23 Multi-threaded tests .... i.e. 35K - 36K (IDP) and 41K (MCE).

Re: Recommended ACLL/DCLL values for Intel Defaults Profile for 14900K processor?

SmartOne_2000 — Sun, 20 Oct 2024 00:34:21 GMT

bump...

Re: Recommended ACLL/DCLL values for Intel Defaults Profile for 14900K processor?

Earl_Intel — Fri, 25 Oct 2024 05:49:42 GMT

Hi SmartOne_2000,

Thank you for posting in the communities!

I will review the information you provided internally and provide an update on this thread as soon as possible.

Best regards,

Earl E.

Intel Customer Support Technician.

Re:Recommended ACLL/DCLL values for Intel Defaults Profile for 14900K processor?

Earl_Intel — Fri, 08 Nov 2024 07:01:34 GMT

Hi SmartOne_2000,

Thank you for patiently waiting, to answer your inquiries.

We tested on Intel Raptor Lake Reference Board which the AC LL = DC LL = 1.1mOhm.

Your MCE BIOS is OCed by default and we recommended you use the latest BIOS with Intel Default Settings.

Also note that our performance claim for 0x12B is: Intel’s internal testing comparing 0x12B microcode to 0x125 microcode – on Intel® Core™ i9-14900K with DDR5 5200MT/s memory - indicates performance impact is within run-to-run variation. Both 0x12B and 0x125 are using Intel Default Setting.

Best regards,

Earl E.

Intel Customer Support Technician

Re:Recommended ACLL/DCLL values for Intel Defaults Profile for 14900K processor?

Earl_Intel — Tue, 12 Nov 2024 08:05:29 GMT

Hi SmartOne_2000,

I wanted to follow up and see if you've had a chance to review the answer regarding to your inquiry.

Best regards,

Earl E.

Intel Customer Support Technician.

Re: Recommended ACLL/DCLL values for Intel Defaults Profile for 14900K processor?

SmartOne_2000 — Tue, 12 Nov 2024 14:11:59 GMT

Yes, Earl. Thank you for the answer. All is good now.

Re:Recommended ACLL/DCLL values for Intel Defaults Profile for 14900K processor?

Earl_Intel — Mon, 18 Nov 2024 00:57:15 GMT

Hi SmartOne_2000,

Thank you for the confirmation, I will close this inquiry now.

If you need further assistance, please submit a new question as this thread will no longer be monitored.

Best regards,

Earl E.

Intel Customer Support Technician.

Re: Re:Recommended ACLL/DCLL values for Intel Defaults Profile for 14900K processor?

diegodinizfsa — Tue, 09 Jun 2026 21:32:38 GMT

i´m having a LOT of crashes with my brand new 14900k here (NEW, not degraded).
Is it because my BIOS settings in Auto put these values when i leave LLC in Auto (Level 3) :

AC = 0.55
DC=1.00

???

When i´m playing games...PC freezes and Reboot.

I´m trying LLC level 6 to stop these crashes. And with LLC on Level 6, the values are:

AC = 0.55
DC= 0.49

Which settings i have to use to stop these crashes? i´m pretty sure this is BIOS settings about voltages doing something wrong.

Re: Re:Recommended ACLL/DCLL values for Intel Defaults Profile for 14900K processor?

PC1997 — Wed, 10 Jun 2026 02:59:13 GMT

Hello @diegodinizfsa ,

Before tuning loadlines, I'd check:

1. Is the motherboard running the latest BIOS with Intel's recent stability/microcode updates?

2. Are Intel Default Settings enabled, or is the board using vendor-enhanced settings?

3. Is XMP enabled? If so, test with memory at JEDEC defaults.

4. Have you run memory diagnostics (MemTest86)?

5. What motherboard model are you using?

6. What are Vcore, package power, and temperatures under load?

Random freezes and reboots during gaming can be caused by:

RAM instability (very common)

Motherboard auto-voltage behavior
CPU instability
Power supply issues
BIOS bugs

Also, LLC6 is significantly more aggressive than LLC3 on many boards. Increasing LLC raises load voltage and reduces droop, which can sometimes improve stability, but it can also create voltage overshoot. If LLC6 appears more stable, that doesn't necessarily mean LLC3 was the problem—it may simply mean the CPU is receiving more voltage.

I'd first load Intel Default Settings, update the BIOS, disable XMP for testing, and verify stability there before manually tuning AC/DC loadlines or LLC.

Your motherboard's automatic voltage/loadline configuration may not provide sufficient margin for your particular CPU sample. Before changing LLC further, test with Intel Default Settings and verify whether the instability remains.