VRM Overview

Specifications

The ASRock B550 PG Riptide matches the X570 PG Riptide with this odd VRM design. It features an 8-phase VRM configuration; two sets of four Vishay SIC654 power stages controlled by PWM doublers. The two SoC phases are independent. A slightly weird choice, but this is a cost-saving tactic.


For the VRM controller, ASRock implemented the UP9505S. It is a 4+2 PWM phase controller. The ability to set the switching frequency is absent in the BIOS.


The ASRock B550 PG Riptide uses Vishay SIC654 power stages for all phases. There are eight stages for the Vcore and two stages for the SoC. These power stages each support a maximum of 50 A of continuous current. At the time of writing, ASRock's website lists these as 60 A, which is incorrect.

The ASRock B550 PG Riptide has a maximum output of 500 A, with 400 A dedicated to Vcore.


The ASRock B550 PG Riptide is using UP1911R intelligent doublers. These support four-phase output with two single inputs. The reason four doublers aren't on the back is that each of these is effectively two doublers in one.

After testing the X570 PG Riptide that uses this exact setup, I have my reservations about how effective it is for those into any sort of overclocking. Now, note that this is a budget-orientated motherboard not marketed toward that consumer base. ASRock saves money once again while still providing the same level of performance as four basic PWM doublers in this particular setup.