Gigabyte Z270 overclocking assistance guide
Gigabyte Z270 overclocking assistance guide
Hey everyone,
I’m new to overclocking a CPU and have a few queries. I followed the instructions in the overclocking guide for the Gigabyte Z270 series motherboards here: https://view.joomag.com/gigabyte-z270-ov...1483933769. I managed to reach a stable overclock of 4.8ghz on the 1.31 CPU VCore using Prime95. Here are my questions:
1. How should I configure adaptive VCore? I’m not entirely clear on the full process, but I’ve heard that keeping my CPU at a constant high voltage might be risky.
2. Is 1.31v suitable for a 4.8ghz overclock on the 7700k? I saw some people achieve 4.8 under 1.31v, though I know chips vary and it’s not a one-size-fits-all solution. I’m also using a Fractal Design S24 240mm liquid AIO.
3. When idle, my CPU VCore reads 1.308 according to HWMonitor, which matches what I set in BIOS. But when Prime95 runs, it drops to around 1.2–1.3v. Is that typical?
4. How noticeable is the performance difference between 4.7ghz and 4.8ghz? With my current voltage of 1.31, I’m seeing temperatures in the high 60s to mid-70s. In contrast, at 1.26v for 4.7ghz I’m in the low to mid 60s, which is a threshold I prefer more of.
Let me know if you have any advice!
I basically have that setup already. Using a fixed vcore is generally what you do to determine the CPU's limits and requirements. First, reset your BIOS to its default settings. I followed this guide and it worked well. You can skip the "Skylake" section since the rules remain largely the same, just noting the CPU can handle another 300Mhz or so.
https://www.tweaktown.com/guides/7481/tw...index.html
Second, a 1.31 voltage is typical for around 4.8Ghz based on what I've observed.
Third, this phenomenon is called voltage droop. Load Line Calibration can help offset it, though it slightly raises the maximum voltage under load.
Fourth, the difference is minimal. If you're prioritizing temperature control over performance, that's essentially the trade-off you need to accept.
Adaptive voltage is beneficial. It lowers the multiplier and the related vcore when the CPU is idle. The naming conventions differ, but a tuning adjustment should exist in the advanced settings of your BIOS. In Windows power management, you must also set the CPU's busy percentage to decrease from 100% to a lower value.
2. A 1.4v Vcore is near the maximum for overclocking.
As of 6/9/17, how much can be overclocked with a reasonable 1.4v Vcore?
I7-7700K
4.9 83%
5.0 62%
5.1 29%
5.2 6%
4. Run at a multiplier that feels right to you. The change will be minimal compared to 4.7 versus 4.8.
You certainly have the means to compare this yourself.
Eximo has essentially completed the build. Setting a fixed vcore is generally the approach used to determine the CPU's capabilities and requirements. First, reset your BIOS to its default settings; this method proved effective according to the guide you referenced. The "Skylake" section can be disregarded as it doesn’t significantly change the general guidelines—just note that the processor supports another 300Mhz. A reliable resource is https://www.tweaktown.com/guides/7481/tw...index.html.
Typically, a voltage of 1.31 is considered standard for around 4.8Ghz performance. This phenomenon is called voltage droop, and Load Line Calibration can help mitigate it, though it slightly raises the maximum voltage under load. The difference is usually minor; if your goal is to balance temperature and performance, that’s the main trade-off you’ll face.
Thanks a lot for your assistance—the guide seems complex, but I’ll review it more carefully once I’m back. For your specific question about adjusting LLC settings so voltage adapts with usage without hitting maximum even when idle, you’d need to explore those options further.
The LLC only adjusts the scale for CPU voltage when under load. The power-saving options remain distinct. You might manually turn them back on, but starting fresh now makes things easier since you understand the CPU's basic behavior.
In Windows power settings, adjust the CPU busy limits to range from 20% to 100%. In your BIOS, the vcore setting might already adapt automatically. Confirm with cpu-Z. During idle mode, vcore and multiplier should decrease, but under stress tests they should reach their maximum levels.
Eximo:
The LLC adjustment only modifies the scale for CPU increase voltage when under load. The power-saving options remain distinct. You might manually turn them back on, but starting fresh now makes sense since you understand the CPU's basic behavior. In short, once I know the voltage needed for a 4.7 overclock, I revert to 'load optimized defaults' in BIOS and adjust just the CPU voltage and Multiplier. I assume the defaults already include the power-saving modes or LLC is enabled automatically.
Be cautious with "optimized defaults."
They might be too forceful.
The simplest approach is to raise the multiplier across all cores and keep the voltage set to auto.
This should yield a decent result.
Next, try adjusting adaptive voltage or whatever method you prefer for gigabytes.
1.35 was the standard voltage for an i7-7700k at that time. That setting was from the original BIOS for the Gaming 5; I don't remember what it defaulted to after an update a few weeks later. Running at 1.35 volts isn't too bad, but if you aim for 1.31 volts you might need to apply a negative offset, though that could cause issues during idle. It seems the LLC feature is likely still required, as I discovered. Generally, keeping all C states enabled allows the CPU to lower its clock speed when not needed. You should be able to leave the voltage at the default and let everything else auto-adjust. When I'm home, I can explore the BIOS settings more thoroughly. It's been a while since I've looked into there.
Eximo:
The default voltage for an i7-7700k was 1.35 as I remember. That setting was with the original BIOS for the Gaming 5; I don't recall what it changed to after a BIOS update a few weeks ago. Running at 1.35 is not problematic, but if you aim for 1.31 you might need to apply a negative offset, though that could cause issues during idle. LLC seems still important, at least I found that out. Generally, if all C states are left enabled, the CPU will slow down when not needed. You should be able to leave the voltage set and let everything auto-adjust. When I'm home, I can explore the BIOS settings more thoroughly. It's been a while since I've looked into there. If you have time, it would really help me understand how to set an offset or adaptive vcore. I'll figure it out eventually.