overclocked to 5.0 GHz and achieved multiplier lock at 46% after setting the 9900k multiplier lock.
overclocked to 5.0 GHz and achieved multiplier lock at 46% after setting the 9900k multiplier lock.
I have a Be Quiet Pure Rock - air cooled but it performs well enough in the bios to support 5ghz. The first time I overclocked it reached 5ghz then subsequent attempts were lower. If I can't improve further with my RAM, I'm wondering if the board itself is the issue, shouldn't be so difficult to reach that speed?
I'm beginning to suspect it might be my board. However, my BIOs clearly offers an option to raise the frequency to 5 GHz, which isn't functioning properly. Therefore, it can't be...
I'm struggling to improve my OC performance, it's stuck at 2133 and not reaching the 3200 it should be. This might mean my board isn't working properly.
I came across someone on Reddit who shared a post from a year ago about getting the 9900k to 5.0GHz on all cores with our motherboard. He didn't explain the process and hasn't posted since then. RIP. I plan to reach out to see if he's still active and maybe get his specs. If I receive an answer, I'll share it here.
I would initially look through your BIOS for settings that might restrict your TDP, and turn them off since any full-core processing above 4.6 GHz would likely surpass 95W TDP.
You may also prefer using Intel's XTU to fine-tune performance more precisely, as it allows gradual adjustment of maximum turbos based on core activity, voltage settings, and other parameters.
Staying in Balanced power mode is another option, letting you activate high clock speeds only when necessary.
Began using Asus AI Suite, currently operating at 5 on the first three cores and 4.7 on the rest. It appears stable, though I can't increase my RAM, it keeps refusing.
Remember that most i9-9900k CPUs aren't stable at a fixed 5GHz across all cores.
It's likely the issue isn't with the board or the RAM.
I wanted to mention this because I was unaware of it. My Google game is quite weak, and my CPU isn’t stable at 5 GHz.
Sharing this for anyone facing the same problem later, as noted at the bottom:
I struggled to get my CPU to run at 5 GHz despite adjusting my BIOS settings. Even after following every YouTube tutorial I found, nothing worked. I also read articles but didn’t find much useful beyond what Alceryes mentioned.
While browsing the forum, someone talked about Intel XTU software. I installed it, adjusted all cores to 5 GHz and set the voltage to 1.32 V, and suddenly it functioned properly. CPU-Z confirmed the speed was 5 GHz. I ran a stress test with OCCTS and immediately got a blue screen. After restarting, I reset everything back to 5 GHz (which then changed to 1.33V) and experienced another blue screen. This time, I heard strange noises from my water pump or CPU, which made me reconsider using 5 GHz altogether. This chip is costly, and I don’t want to risk it.
I used XTU to revert everything to default settings and removed XTU so I could test OC with the BIOS.
I set the BIOs to 4.9 GHz, but that didn’t work as well—even with the multiplier set to 50 in BIOS (as mentioned in post 1), the highest I reached was 4.7 GHz. Now I’m at 4.9 GHz and 1.29V, which crashes after about 15 minutes of stress testing.
At this stage, I’m thinking it’s best to skip this path. Maybe sticking to 4.8 GHz would be better. I tried to get as low as possible with 4.8 GHz, but the lowest I could reach was 1.27. I ran a stress test for 8 hours with OCCTS and 4 hours with RealBench. I’m comfortable at 55°C while playing VR Racing Games at full settings.
I suspect my BIOS prevented me from exceeding 4.7 GHz for a reason. I might have missed an important warning. I hope this helps someone in the future.
Cliffs:
BIOs couldn’t reach 5 GHz
XTU could reach 5 GHz
My CPU struggles with 5 GHz
I’m now running at 4.8 GHz and it’s fine
I managed to get through BIOS up to 4.7 GHz (even with multiplier set to 50), but the performance was poor—crashing after about 15 minutes of stress testing.
By this point, I’m deciding against this route. Let’s try a more stable option at 4.8 GHz instead. I pushed as low as possible to 4.8 GHz, but the lowest I could get was 1.27. I ran a stress test for 8 hours with OCCTS and 4 hours with RealBench. I’m comfortable at 55°C while playing VR Racing Games at maximum settings.
I think my BIOS limited me from going higher than 4.7 GHz for a reason. I should have paid more attention. I hope this is useful for anyone following.
I've never encountered such a high number of issues when overclocking a 9900K to 5GHz. It seems the board itself is causing the problems.
When adjusting, I stick to the BIOS only.
For 5GHz settings, I configure:
CPU Ratio - 50 All Cores
Ring Ratio - 47
CPU Core Voltage - 1.21V (minimum stable voltage for my setup) – starting at 1.32V and adjusting down
CPU Ratio Mode - Dynamic
CPU Core Voltage Mode - Override Mode
Intel C State - Disabled
5.0GHz, 5.1GHz, 5.2GHz