The RT8871A is not a native 8+2 phase PWM controller but a 4+1 phase controller with two built in drivers that can handle a pair of MOSFETs. I say “looks like” because just counting chokes is not enough to determining how capable the VRM really is. Underneath the hood, the power delivery system for the CPU is far from the best on a 990FX system with a Richtek RT8871A PWM controller and what looks like 8+2 phases (VDD and VDDNB). While cooling for the chipsets is not a major concern, excellent MOSFET cooling is essential to optimal power delivery for FX processor overclocking. The aluminum heatsinks are held in place with spring loaded screws at the back and use thick thermal padding for the MOSFETs, 990FX north bridge and SB950 south bridge. ![]() Notably absent on the heatsink is a heatpipe similar to the one found on Asrock’s higher-end 990FX motherboards. As with Asrock’s other Fatal1ty motherboards, the design follows a red and black theme with white accents. « Introduction and Packaging | Bundled Software »Ī Closer Look at the Asrock 990FX Fatal1ty Killer MotherboardĪsrock Fatal1ty 990FX Killer motherboard uses a standard ATX form factor on a matte black 4-layer PCB.
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