Should I lower the voltage on my Ultra 7 265K or just restrict boost power?
Should I lower the voltage on my Ultra 7 265K or just restrict boost power?
Hi,
I recently assembled a Windows 11 Pro PC equipped with an Ultra 7 265K processor on an MSI Z890 Gaming Plus Wi-Fi motherboard. The system features 32GB of RAM, an 850W MSI PSU, and a Palit GeForce RTX 3060 graphics card. I installed the latest BIOS for the motherboard, updated the chipset, graphics drivers, and the NPU drivers for the CPU, as well as the newest NVidia drivers for the RTX.
In terms of CPU performance, I run CPU-heavy games, do video editing, and experiment with AI tools like Whisper. During CPU testing with OCCT, I noticed the processor was throttling both thermally and via power management. I opened XTU and adjusted the power throttling limit to 200W, which eliminated thermal throttling (though occasional brief spikes still occurred). The current setting is 105°C at 200W, and it remains stable around 90°C at 210W, throttling every few seconds.
I’m wondering if I should maintain the power throttling level or consider undervolting to achieve a similar effective power cap. I’m trying to avoid throttling altogether since any reduction in voltage feels less smooth than simply limiting it. However, I haven’t overclocked before, so I’m unsure if this approach is sound.
Could anyone please advise? I’ve attached some screenshots illustrating the current configuration—showing the updated thermal limit and the unmodified voltage settings in XTU.
You likely cannot achieve the ideal of both performance areas at once.
Optimizing for video editing means having all processing threads ready, which overclocking can help with.
This will create heat similar to what OCCT is experiencing.
On the other hand, gaming will utilize only a portion of the available threads.
The key is ensuring the primary processing thread runs quickly.
Employing the turbo feature can push one or two cores beyond what a full-core overclock achieves.
I tend to stick with the system defaults and observe the results.
Specifically, how does your gaming look?
You probably won’t be too disappointed if batch editing takes a little longer.
Adjusting voltage settings might lead to surprises if you’re not experienced.
A note from an Intel engineer:
"If you rarely adjust to 100c, you might be missing out on performance."
I don't really like OCCT because it employs some aggressive AVX techniques that cause the CPU to work harder than usual and raise temperatures beyond what it normally handles. It relies on a mixed AVX approach (last update) which is mostly irrelevant for most games. Whisper, on the other hand, depends on AVX for its AI processing, making it essential for speed. I'm skeptical OCCT will help you achieve good temperature performance at your current power limits.
Personally, I'd skip using OCCT for measurements and opt for Whisper instead—putting more workload on the CPU than usual and then figuring out the right wattage.
AVX works well with vector and particle analysis; some games use it sparingly for effects like smoke or debris after explosions, but it's only active briefly, so it only slightly increases power draw. Whisper requires constant AVX usage, which is a significant advantage, particularly on turbo cores and multi-core setups.
Thank you for your detailed input. It has been really helpful.
To clarify a few points, the cooler is a quiet model! Dark Rock 5 and the case is a Corsair 300R (which has housed an i7-6700 for the past decade). The room temperature is around 20C.
I chose the Dark Rock 5 because it performed well without needing a dual radiator or AIO. I could possibly add a dual air cooler or two fan AIOs in the 300R, but it would be quite tight.
This marks my first use of OCCT as a testing tool (previously I used XTU, FurMark, Prime95), and it’s also my first time seeing a CPU outperform an air cooler (as I mentioned I don’t overclock).
I ran Cinebench 2024 yesterday and achieved around 2000 with the boost set to 200W and short boost at 250W (the same result with both boosts at 300W). I got slightly lower scores using XTU open, but no thermal throttling and low temperatures even at 300W caps.
Playing Arma 3 (which is old but CPU-heavy) didn’t cause any problems.
For now, I plan to stick with it and monitor real-world usage more closely, instead of focusing too much on OCCT results. I’ve always aimed to ensure the cooler can handle whatever the CPU throws at it, but here I might need to be a bit more practical.
If real-world tasks start causing issues, I’ll upgrade to a better cooler—probably double air rather than AIO, which I’m not keen on. I might repurpose the old i7-6700 into another setup, like an Unraid server or a bigger case for this new rig.
I’ll try Whisper processing later to see how it performs.
Your advice on undervolting is also greatly appreciated; it’s clear that if needed, more cooling will be a better solution than undervolting.
Thanks again for all the guidance.
A larger case doesn't automatically mean better performance. MATX dimensions actually offer superior airflow potential compared to other sizes. The key factor lies in balancing fan power against volume. A 120mm fan set can quickly clear all heated air from an mATX case. Switching to a standard ATX with 3/2 120mm fans takes a few minutes, while a super tower may require up to six minutes. Meanwhile, the warmed air from the case ends up feeding your cooler, which is already running hot.
Size isn't the main concern here, and it remains a solid cooler choice in most cases. The only real drawbacks are two: first, the 300R rating isn’t ideal for airflow, and the rear fan is mainly for air coolers; second, power consumption matters. For a 200W cooler, using that much power from the CPU will cause the chip to overheat quickly unless you reduce usage.
The best approach is to choose a cooler that handles twice the wattage. Intel’s recent advancements in AIO 360mm designs are pushing this limit. If you’re consistently using around 200W, aim for a minimum air cooler rated at 300W. For example, my mITX full loop supports up to 500W, and with a combined CPU/GPU load of 280W, temperatures stay well below 100°C—even during heavy stress tests. The coolant never exceeds 36°C, regardless of fan setup.
Even if you prefer AIOs, a decent 280mm air cooler such as the nzxt Kraken X60/X61 can deliver around 350W of cooling. Mount it on top for exhaust, remove the rear fan, and use a magnetic filter over the back holes. This setup should eliminate temperature problems entirely.
In your situation, a dual tower cooler should work well if you prefer something smaller. The Cooler Master Hyper 612 Apex performs nicely and matches the dimensions of your current setup.
The 265K model uses less power when fully loaded, especially with DLVR enabled. The maximum power I observed was about 230W at stock settings. For better control even in extreme cases, a cooler that offers slightly higher performance would be preferable.
My reading indicates your case suits a 170mm high cooler. This applies to most twin tower models. Keep an eye on performance; if cooling feels inadequate, a more powerful twin tower cooler can be added. Your setup allows for two front 140mm intakes, offering increased airflow at lower RPMs compared to 120 fans. I don’t like adjusting voltages, whether high or low. Lacking detailed knowledge might lead to problems that didn’t exist before. Occasional throttling is acceptable as long as it’s brief and infrequent—this is how the processor safeguards itself. Stress tests use commands not typical for gaming or apps. The most accurate evaluation comes from your own app usage.