Endless reboot cycle at 5GHz
Endless reboot cycle at 5GHz
CPU: 9700k
mobo: Z390 AORUS PRO
bios version: F12d
cooler: Kraken x62
stress test used: Prime95 (Small FFTs)
I struggled to achieve a consistent 5GHz clock.
The board arrived yesterday, and I spent about an hour on the F11 BIOS attempting to reach a stable 5GHz at any voltage up to 1.4V.
At lower speeds (1.35-1.36), it would cause a BSOD upon booting at the login screen.
Above 1.37, it would display a blue screen immediately when starting a stress test.
With auto voltages, it stabilized at 5GHz, but I experienced thermal throttling at 100°C during testing.
Recently, I found an F12d BIOS update claiming to "Fix CPU Vcore and power behavior."
I remained hopeful, but improvements haven’t materialized.
I experimented with increasing the voltage to 1.37V while keeping clocks at stock, which worked.
Then I set clocks to 5GHz and instead of a blue screen, I kept rebooting at the login screen.
I’m still unsure what was happening back then.
Unfortunately, when using auto voltages at a stable 5GHz, I wasn’t aware that VOUT is a preferred reading over VID, so I lack clear details about the voltages I was applying.
HI - not every 9700K CPU can reach 5ghz with all cores. It seems your chip isn’t quite that powerful. Typically, when you overclock, you begin at a lower frequency and gradually increase it. The official maximum boost frequency for a 9700K is 4.6 ghz, so starting there makes sense. Locking all cores at 4.6 is still considered an overclock, and turbo speeds are usually only achieved briefly when temperatures are low.
Once you identify the lowest stable voltage at 4.6, you can try increasing it slightly. It looks like you’re nearly there to reach 5ghz, so the chip should handle it well at 4.8 or 4.9. The gap between 4.8 and 5ghz cores isn’t very noticeable.
Hey, thanks for the update.
I’ve upgraded mine to 4.7GHz with a voltage of 1.37v.
I’m not sure if you’re familiar with vdroop – I don’t know – but I’m starting to think it could be related. The Vdroop graph in the bios shows the steepest load-line. During my stress test at that frequency, my voltages dropped much lower than expected.
This photo might have been taken at a worse time; I usually noticed my readings falling into the 1.1xx range.
This Corsair TX650M works fine. My motherboard supports both 8-pin and 4-pin CPU power, but I’m only using the 8-pin version. I thought it would be sufficient since I wasn’t planning heavy overclocking and I don’t have the right cables.