Core and Uncore ratio doubts
Core and Uncore ratio doubts
Hi guys, how are you all?
I have a question: I have an i7 4770k with a 4.5 GHz clock and 1.3V core voltage. While checking the BIOS, I noticed that the uncore ratio is set to auto, and the suggestions say the uncore should match or exceed the core ratio. Is this accurate? Should I disable auto and set the uncore to 45 as well? Could this lead to some real performance gains? Might there be any risks like instability?
Also, another point: I’m using a 1.31V core voltage at 4.6 GHz. Do you think I can achieve a stable OC with less power? I understand that going above 4.5 usually requires something around 1.3V or higher. Or am I misunderstanding?
You can configure 1.30Vcore and run rum prime95 for around 12 hours without issues. If there are no problems, you can lower the voltage a bit more, though I don’t mind. Proper cooling will help you avoid any concerns.
the uncore or bus and cache ratio refers to the CPU's cache speed. Only after achieving stable overclocking on your CPU should you consider boosting the uncore. Then, try to match the cache speed to your core clock if you can. However, the uncore is mostly unnecessary for overclocking unless you're willing to experiment with it, as it only offers a small performance increase.
TechnicalInAZ:
the uncore or ring bus or cache ratio refers to the cache speed on the CPU. You should only overclock the uncore after achieving stable performance with your core. Once that's solid, try overclocking the cache to match the core clock speed if you can.
However, the uncore is not essential for overclocking unless you're willing to experiment. It won't significantly improve performance.
Thanks for being right
I recently increased the uncore to 45 directly and the PC froze
I also have a question if you can assist me
I'm using 1.31v to reach 4.6, is this a typical Vcore? Do you think I can maintain stability with a lower setting? I've seen that main 4770k usually requires more than 1.3 for 4.5 or higher. Are you correct?
Thanks again
You can configure 1.30Vcore and run rum prime95 for around 12 hours without issues. If there are no problems, you can lower the voltage a bit more, though I don’t mind. Proper cooling will help you avoid any concerns.
Maintain an Uncore Ratio of 100 MHz under the CPU Core Ratio. For instance, Core to Uncore ratios such as 4.7 / 4.6, 4.6 / 4.5, and 4.5 / 4.4.
Here is your rewritten text:
Hi everyone, how are you all?
I have a question—I’m using an i7 4770K with a 4.5 GHz clock and a 1.3V core voltage. While checking the BIOS, I noticed that the uncore ratio was set to auto, and the system suggested keeping the uncore equal to or higher than the core ratio. Is this correct? Should I disable auto and set the uncore to 45 as well? Would that give a real improvement? Could there be any problems like instability?
Edit: Another point—I’m currently running a 1.31 Vcore at 4.6 GHz. Do you think I can achieve a stable OC with less power? I know that once the core voltage goes above around 4.5, we typically need an uncore ratio closer to 1.3 or higher. Am I mistaken?
EXPLANATION
The uncore setting is straightforward and works across various motherboards (like Gigabyte or Asus). It affects the cache frequency of the CPU. You’ll need to adjust the uncore ratio in the BIOS manually because it stays fixed at the default 35 (3.5 GHz) even after overclocking the CPU clock. My Gigabyte Z170 board advises setting the uncore equal to or above the CPU clock ratio. They’re right!
Ideally, the uncore should match the core ratio at stock speeds, or be higher during overclocking to avoid bottlenecks. On my Intel i5 6600K, I set the core to 46 (4.6 GHz) and the uncore to 49 (4.9 GHz)—definitely higher than the core. I tested stability on a 2H Prime95 Blend test up to an uncore of 52, and it worked well beyond that, though performance drops after 49.
For testing, I measure how long it takes for the system to finish the Prime95 800K benchmark across four workers. Setting the uncore to 49 instead of 40 cuts the time by about 7 minutes (from 48 to 41 minutes). That’s roughly a 14.5% boost in raw processing speed. The temperature only slightly increases, staying around 84°C with 26°C ambient and 104.5W power draw. I had to raise the Vcore from 1.355V to 1.390V for stability.
The PC’s stability (no BSODs or crashes) has improved significantly—very much noticeable.
Games that usually need all four cores (like 96-98-100-97%) now perform better with 83-85-93-84% settings, showing a clear gain in CPU performance. This is truly amazing! 😄
I am now operating my 6600K at 4.6 GHz following the manual adjustment of VCore to 1.380 V in the BIOS. With this configuration, I configured the Uncore Ratio (cache) to "49" (or 4.9 GHz)—a significantly higher setting than the Core ratio! It remains exceptionally stable against any stress Prime95 can apply, and it continues to perform reliably for as long as desired...