RTX 4090 Founders Edition PCB breakdown notes
Added 2022-10-12 22:49:19 +0000 UTCInput filtering bulk capacitance
13x 180uF 16V TH aluminum polymer
13x 100uF 16V SMD tantalumn polymer
Vcore
Controller: MP2891 10 phases
MOSFETs: 20x MP86957 70A SPS (2 per phase)
1.2V 500KHz 150nH (power stages only?)
300A ~23W
400A ~35W
600A ~60W
800A ~96W
Vcore VRM bulk capacitance: 40x 330uF SMD poly
Vcore core bulk capacitance: 6x 10x MLCC back of core
Vmem
Controller: MP2891 +3 phases
MOSFETs: 3x MP86957 70A SPS (1 per phase)
Vmem bulk capacitance: 9x 220uF SMD poly
Notes:
I like it. High current handling capability thanks to the MP86957s. Lots of SMD filtering capacitors.
