12-26-2017 07:10 AM - last edited on 03-06-2024 09:36 PM by ROGBot
12-26-2017 07:43 AM
12-29-2017 11:27 AM
12-30-2017 02:09 AM
Skunkfoo wrote:
Anyone experiencing differences in voltages?
PCH Core set to 1.01875 in BIOS
- BIOS reports 1.032
PCH Core set to 1.02500 in BIOS
- BIOS reports 1.040
Aida64 in Windows 10 FCU also reports the same higher voltages.
I'm still hoping someone can tell me if 1.04 - 1.05 volts is safe for PCH Voltages in either the setting or actual reading.
12-29-2017 03:28 PM
12-30-2017 08:03 PM
01-04-2018 10:30 AM
Amurtigress wrote:
Hi Skunkfoo,
I've had quite some experience with PCH voltages in the last 6,7 years. Also because it looks like my previous X79 PCH's default has been rather insufficient.
I can tell you for sure that 1.05V doesn't pose a risk for your system. My own x299 has been running on 1.05~1.10V with no issues. Also I have seen that Supermicro's and ASRock's X299 boards are using 1.05V as default.
Also, please don't read too much into the sensor readings. Such sensor readings are very rough compared to actual multimeters, and to my experience the actual settings of the BIOS are much closer to the real voltage than the sensors.
Ever since I found that my X79 PCH needed 1.275V over the 1.10V default I've had an eye on USB problems and PCH voltages. That had me confused especially because th BCLK has always been 100 MHz. So the PCH has never been overclocked.
Here's a list of problems that I have seen on my old Gigabyte X79 system:
x79 PCH Volt:
1.10v: Various problems. Up to 15 seconds delayed detection of connecting or disconnecting USB devices. Microsoft webcam was not found sporadically.
under 1.16V: GPU driver may crash.
under 1.20v: Bluetooth dongles may have trouble, i.e. with a Wiimote. Wiimote was found but the update rate was too low to actually play on the Dolphin Wii emulator
up to 1.25V: Latency of add-in network card (intel) was inconsistent.
1.275V: Generally better system performance and consistent benchmark results. i.e. Cinebench R15, Valley 3D benchmark, Linx.
Z97 PCH: ASRock used 1.225V on Auto over the official default of 1.05V-The same 175mV offset that I saw was needed on my X79. A friend of mine ran a Linux file server with several harddrives with an ASUS Z97 board on defaults. An external USB3 HDD threw an error in the BIOS upon every launch, and one of his SATA drives was not detected sporadically. His problems disappeared after I recommended him to increase the voltage to around 1.18V.
So, here is my conclusion:
USB problems seem to be a good indicator if the PCH voltage is sufficient or not. Even tho you only see USB problems, the rest of the PCH's internal units (SATA, PCIe hosts, etc.) are most likely not happy either-which may or may not lead to problems. I think especially the SATA controllers and thus data integrity are too crucial to run on too little voltage. And as you can see in my list of problems, even cards and onboard devices connected to PCIe lanes of the PCH can suffer in performance.
I wouldn't be surprised if your problems disappeared fully with a PCH voltage of between 1.05 and 1.075V.
Crossing fingers.
01-07-2018 12:21 PM
Skunkfoo wrote:
Thanks for the comments.
I'm going to start with 1.04 in the bios which will likely read more than 1.05 in Aida64 and see where I end up.
I don't know much about Z97 but when you ran PCH: ASRock used 1.225V with a default of 1.05V, what was intel saying the max PCH voltages were?