Question About Restrictions on 14900 Non-K
Question About Restrictions on 14900 Non-K
I found several 14900, 14900K, and 14900KF CPUs. I recall the 14900 doesn’t match the performance of K versions in multi-threaded tasks, likely due to the default 65W PL1 limit. I’m curious if the K version only lets you adjust the multiplier, or if it also allows other changes. If I have a non-K CPU nearby, can I set its PL1 and PL2 values to match those of the K models? (I usually stick to 180W or less for 14900Ks, depending on the cooler size). For a non-K chip, I’d like similar settings—perhaps around 150W each with possible undervolt adjustments. I have an idea for that one. Thanks.
Using the appropriate board allows adjusting power limits while keeping clock speeds constant. The 14900 model should include Thermal Velocity Boost; maintaining sufficient cooling will help it surpass base clocks permanently. Models below the i7 lack TVB and will throttle once standard time limits are reached. These can be set to extremely high values on Z boards.
Wow, this Thermal Velocity Boost is something you haven't encountered before. It's unclear whether it affects only the idle clocks or also the Turbo Boosts. If you're using a new massuve Thermalright PA140 SE on a regular 14900, what changes are you expecting? The clock speeds remain unchanged. Also, regarding the ASRock Phantom Gaming Z690I LIGHTNING board, how similar in performance can the 14900 non-K model be to the 14900K version? You mentioned a significant difference in scores: 18K versus 22.5K on cinebench multi-core.
14900 stands out in comparison to earlier CPUs that used TVB. I think all the maximum boost frequencies are 5.6Ghz, so normally it would just add a small extra bit, but now it seems it will increase by 100Mhz when the temperature allows for it. For example, if it were to run at 5.4Ghz with Turbo Boost, it would then output 5.5Ghz provided the temperature stayed under 70°C.
The main difference between K and non-K models lies in the sustained power budget. With less power, you receive fewer clocks, plus a smaller boost range to begin with.
You can only adjust by extending the time limits on PL1 and PL2.
Understood. What targets should I aim for on the Turbo Time Limit to replicate the 14900K setting? For PL1 and PL2, I’ll likely set around 150W to 180W, with a maximum of 200W. Does this really ensure the numbers are enforced? I recall the K variant can reach over 300W, but its default PL2 is about 240W.
I generally rely on the standard 56 second turbo time limit. Intel previously favored 28 seconds. I usually adjust PL1 and PL2 to match the cooling solution's performance. It’s unnecessary to restrict CPU power unless cooling is insufficient.
Many motherboards include a BIOS performance option that sets both turbo limits to the maximum, 4095 Watts. The CPU doesn’t actually hit this number, but it’s implemented to prevent power limit throttling. Boards reviewed on sites are often configured at this high setting.
The desired turbo limits must be applied once they’re correctly set in the CPU. ThrottleStop provides access to the Power Limit Clamp feature. Most BIOS versions don’t allow this option for users. When Clamp is enabled for both PL1 and PL2, the CPU should not exceed the specified turbo power values for more than a few milliseconds.
It took some time, but I discovered a YouTube video that evaluates a 14900 non K chip with increased power limits. The creator begins at the default 65W and gradually raises it to over 300W.
View: https://www.youtube.com/watch?v=ZRgN_MUaKbE
It’s disappointing that few people understand what the 14900 non K can do. This chip is sometimes available at reasonable prices because it’s rarely sought after.
I don't be a Linux user, so I can't assist with that.
As long as the BIOS correctly sets PL1 and PL2, activating Clamp might not be required. Some BIOS versions automatically turn on the PL1 Clamp feature. Very few or none enable the PL2 option.
Most issues you encounter stem from certain BIOS versions setting both power limits to unlimited, 4095W.
I'm glad I found that YouTube video. Most review sites have chosen to completely overlook non-K processors. Maybe Intel wanted them to keep this quiet. It would be simple for Intel to restrict turbo power limits via a microcode update if they truly wished to.
The 14600, 14700 and 14900 non-K models all gain this powerful feature once power limits are raised. A high-end air cooler is usually the main constraint, regardless of whether you're using a 14900 or a 14900K.