AMD A55 User Manual - Page 19

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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)

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 for CPUs that demand 125W or 140W power consumption.

Appendix

Figure 1

Figure 2