ASRock Fatal1ty 990FX Killer Motherboard
Voltage Regulator
Contents
The CPU voltage regulator circuit of the ASRock Fatal1ty 990FX Killer has eight phases for the CPU main voltage (VDD a.k.a. Vcore) and two for the CPU VDDNB (integrated memory controller, HyperTransport interface controller, and L3 memory cache) voltage. Therefore, it uses an “8+2” configuration, using a digital design.
The voltage regulator is controlled by a Richtek RT8871A chip. Each phase is driven by one PSMN9R1-30YL (“9130AL”) and one PSMN5R8-30LL (“5830DL”) transistors.
The voltage regulator circuit is shown in Figure 8.
Figure 8: Voltage regulator circuit
The ASRock Fatal1ty 990FX Killer uses solid electrolytic capacitors. All coils on this motherboard are ferrite-core models, which can provide up to 20% improvement in efficiency.
If you want to learn more about the voltage regulator circuit, please read our tutorial on the subject.
