5). How to configure PBO? Feat. GIGABYTE B450 AORUS Pro Wi-Fi
Before we continue on how to configure PBO on the B450 AORUS Pro Wi-Fi motherboard, on the BIOS we did the tests (F2b), Precision Boost Overdrive Scalar is not within the options. After testing many times PBO enabled/disabled, I think I can confirm, once you activate PBO, it uses the 10x prefix by default. Our suggestion on how to lower the voltage while using PBO is explained in this section.
Reminder: With PBO activated, the voltage that is fed to the CPU increases and the limiter on current is amplified. Therefore, you will see higher CPU temperatures and higher temperatures on the VRM. To see the best results, we suggest a good cooling system. Taking the 2700X as example, changing the Wraith Prism to a 280 CLC liquid cooler, yields -20 to -25 degrees Celsius lower temperatures.
Reminder #2: We recommend having a good power supply (80 Plus Bronze or above) because, even though this might not be considered overclocking by everyone, the demand on the system with PBO activated is more demanding, similar to manual overclocking. Never cheap out on your power supply.
Step 1: To access the PBO option within the B450 AORUS Pro Wifi, it is under the AMD CBS Option (Peripherals Tab).
Step 2: Inside AMD CBS, go to the NBIO Common Options.
Step 3: Inside NBIO Common Options, go inside XFR Enhancement.
Step 4: There will be a warning message, press accept. Please do not use this option with cheap power supplies (though in the case of a 2700X, it would not make sense to pair it up with cheap PSU).
Step 5: Change the option of Precision Boost Overdrive to Enabled.
Disclaimer: Before testing PBO enabled, we would suggest to ensure there is no issues with RAM whatsoever and the system is stable.
It is that simple. I remind you once again, depending on the cooling solution you have, you will get better results. According to our testing, it is most likely that a Ryzen 5 2600X will work without any worries to the end user in every type of tasks, including heavy productivity workloads.
Using a Ryzen 7 2700X, if it is only gaming, gaming + streaming and not so demanding productivity workloads, this product should not have too much issues. We will discuss the temperature of this board later and in the conclusion with a more in-depth analysis.
The last section on this page will talk on how to reduce the voltage on the CPU so it can benefit on lower temperatures on both CPU/VRM and longer silicon life and surprisingly a small tad of extra performance.
Pro tip: How to decrease voltage and temperatures using PBO?
By activating PBO, the voltage fed to the CPU and temperatures rises, to levels close enough to manual overclocking. To subdue that, the easiest way on this motherboard is by using “Offset Voltage”.
If you ever used Intel XTU (Extreme Tuning Utility) or ThrottleStop with laptops, to decrease temperatures, what we are about to suggest is the same concept. We will give a negative “offset” to the CPU.
The process to reach a stable negative Offset might take some time and patience. I cannot give a precise number because every processor is different (silicon lottery) and some might need a lower or higher negative offset voltage to be stable on all tasks.
Dynamic VCore (DVID) is the option you want to work around in this motherboard to use negative Offset Voltage. It is under Advanced Voltage Settings. After many days of testing, I found stability in all kinds of workloads by using -0.090v (-90mv). This value can differ from CPU to CPU.
My personal experience: I started with -0.120v (-120mv), but with that voltage the PC did not booted up. Do not worry; after a few retries the PC boots itself and one can access BIOS. It might show a message of the configuration you applied could not post and one can choose to enter the BIOS again. Just to make sure to go to AMD CBS PBO Enabled since sometimes it goes back to default when there is boot issues.
After that, I tried with -0.116v and PC booted, went into Windows, but had a BSOD (Blue Screen of Death) soon afterwards. Within some attempts, I went to -0.102v and it was stable on CBR15 loads, but on single core tasks, the system hanged up. After some tries I reached the -0.090v (-90mv) and it has been stabled in all kind of tasks for many days.
The process can be take a while and might be tedious for some people, but it is really worth it since you will see lower temperatures on the CPU and less stress on the VCore VRM. Theoretically, it should increase the CPU lifespan instead of just enabling PBO.
I would suggest playing ranked matches or do important work while testing. Like in overclock, take a weekend to test little by little and make progress.
For those who do not want to tweak a lot, I will give a random number of -50mv. Probably most of the CPUs are stable with that offset and your CPU will appreciate it.
Those who want to tinker the most, probably can start with -100mv and see if it needs less or more voltage.
Spoiler: The best results in Cinebench R15 in these days of testing with PBO enabled, using the B450 AORUS Pro Wifi motherboard + Ryzen 7 2700X.