7). Temperatures/consumption and sensors
VRM Temperatures is one of the weak points of this motherboard, as long as you are using a demanding processor (2700X) in heavy workload scenarios. Within the B450 chipset motherboards, there are some models that have better performance on this department.
Our methodology normally uses a fixed voltage (1.425v VCore) and use a LLC Profile to reduce the possible VDroop so voltage remains stable. Then we stress test the board and measure the VRM temperature on the hottest spot. Since this model does not have fixed voltage and LLC, we opted to use stock settings.
In addition to our OCCT AVX stress routine, we decided to run a more realistic workload, Blender for one hour to measure the VRM temperature under such task, since OCCT AVX is unrealistic in daily situations.
The results we use are in Delta Temperature over ambient, this means we take off the ambient factor from the reading. Using the X470 AORUS Gaming 7 Wifi as an example, using OCCT AVX 1.425v LLC Extreme, the temperature readout ΔT over ambient is 64.5 degrees Celsius. If you would live on a place that has 30 degrees Celsius ambient, this would traduce on a temperature readout of 94.5 °C.
The tests are done in the worst case scenario, open test bench with no air flow.
CPU used on tests: Ryzen 7 2700X
The GIGABYTE B450 AORUS Pro Wi-Fi motherboard has VRM temperatures issues when using stock settings with a 2700X under OCCT AVX workload. The VRM temperatures reached 122 °C (106 °C + 16 °C) before frequencies started to throttle (VRM throttle).
122 degrees Celsius
For those who are not aware what VRM throttling is; the frequency of the CPU goes down as seen on the screenshot and performance is lost. This happens so the Mosfet on the VRM phase keeps going up on temperature. On the bright side, the mosfets show that have OTP (Over Temperature Protection) once they reach their max working temperature (120-122 °C).
If the Mosfets would not have OTP, they would keep rising on temperatures and that would be bad news.
OCCT AVX is a heavy workload and not realistic to day-to-day usage, so we tried using Blender (1 hour), which can be a real task an end user could use.
The results were better, with a maximum of 81 °C Δ T over ambient (97 degrees considering ambient temperature). Giving another approach, if the test would take place in an ambient temperature of 30 degrees Celsius, the reading would be 111 °C.
On a side note, using the Ryzen 7 2700X (using PBO -90mv) we did not see the temperature of the mosfet go above of the 55 °C.
The consumption tests are pretty simple and straightforward. The X470 AORUS Gaming 7 Wi-Fi consumes more than B450, which is no surprise. There is one exception and it is during OCCT AVX workload. The logical assumption is that the B450 ends up consuming more because of the higher temperatures on the VRM and power efficiency goes down, increasing the current demand. The graph is Total System Consumption and we use the same testing hardware for all of them, unless specified.
The sensors of voltage is probably my highest criticism on the motherboard, because sensor readout while using software is totally broken in a specific scenario. We will begin with HWInfo64 (CPU Core Voltage SVI2 TFN) when using stock configuration (no PBO). The voltage difference here is not bad and is acceptable (except idle voltage readout).
What worries me is when you apply +/- Offset Voltage through BIOS. The measurement on HWInfo64 becomes totally broken and is not reliable. To assess this, we will use a Multi-meter to read out what are the readings behind the socket, which gives us a real time measurement of what is going on. We will use three different scenarios (Idle, Cinebench R15, PUBG) and different types of setups:
-Voltage under Stock Configuration (no PBO/XMP enabled).
-Voltage using Precision Boost Overdrive (PBO).
-Voltage using Precision Boost Overdrive + Offset Voltage (PBO + Offset).
According to our testing, when using stock settings and PBO without offset, the software readings are not precise, but they give an approximate. Software sensor read outs does not have a good track history.
The issues occurs when you use +/- Offset Voltage. Compare the readings between PBO -90mv, software readings versus multi-meter readings. The software read out for now is completely broken.
Initially I had doubts to give our recommendation award to this model, but putting aside the software reading error, one can see while using PBO -90mv offset, the voltages are very good for daily usage. This data gives us also the confidence to suggest Precision Boost Overdrive with –Offset Voltage to the end user.
Not everything is bad news for the sensor readouts. Like other GIGABYTE models, the B450 AORUS Pro Wi-Fi has a sensor reading for the power phase (VRM) and it is accurate. The difference between software sensor reading and what we measure directly from the motherboard is nearly zero.
This is welcomed because not all users will use a measurement instrument to verify the temperature on the motherboard’s mosfets. The sensor reading on HWInfo64 for the VCore VRM is under “Temperature 5”. In a future HWInfo64 update, this will be updated with the correct name (probably). Here is a screenshot.