AMD KM780V - Manual (Page 20)

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APPENDIX I
Subject 1: Regarding the Application of 3-Phase or 3+1 Phase Power
Supply Mold
As a result of the increasing power consumption demand from many AMD CPUs in
current market, we suggest not to use a CPU that demands more than 65W power
consumption at work for an AMD CPU compliant board that comes with power supply
design as 3 phase or 3+1 phase mold and MOSFET design as working in High SideX1
and Low SideX1 mold so as to avoid MOSFET getting burned or other phenomena like a
halted system or system instability. So please take notice of the CPU you are using and
make sure that it is one that demand not more than 65 W to ensure long-term working
order.
Note：
1. The relation between CPU Power Consumption Amount and Power Phase: depending on
difference in voltage rating, one-phase of power can provide 25~30W to the motherboard.
2. 3- Phase Power Supply Mold: motherboard with 3 inductances for CPU power supply,
and each inductance carries with it 2 MOSFET (6 MOSFETs in total) (Figure1)
3+1–Phase Power Supply Mold: motherboard with 4 inductances for CPU power supply,
and each inductance carries with it 2 MOSFET (8 MOSFETs in total) (Figure2)
Figure 1
Figure 2
Solution：
We recommend users choose motherboards with power design of 4-phase, 4+1 phase or more
for CPUs that demand 89W or 95W power consumption.
We recommend users choose motherboards with power design of 5-phase, 5+1 phase or more