3.5 Given A Scenario, Install Or Replace The Appropriate Power Supply Flashcards
Input 110-120 VAC vs 220-240 VAC
Most power supplies have a recessed two position slider switch on rear that is exposed through case. Voltage selector is used to select the voltage level used in country where computer is in service. In the U.S power grid supplies anywhere from 110-120 VAC and in Europe it’s from 220-240 VAC.
Output 3.3V vs 5V vs 12V
Electrical ground is reference point.
3.3v- m.2 slots, ram slots, motherboard logic circuits.
5V- some motherboard components. Many components using 3.3v
12v- integrated LAN, older serial ports, some PCI cards
20 pin to 24 pin motherboard adapter
Main motherboard power. Provides +3.3v, /-5v, and +/-12v.
20 pin connector was the original ATX standard. 24 pin was added for PCI express power.
You can connect a 24 pin connector to A 20 pin motherboard. Some cables are 20 pin t+ 4 pin.
Redundant power supply
Two or more power supplies. Internal to server.
Parallel redundancy or the N+1 option describes an architecture where there is an always single extra ups available (that’s the +1). N stands for number of UPS required for data center.
2n redundancy means the data center, provides double the power it requires by providing two power supplier with one as backup.
Modular power supply
Add cables as needed, fewer leftover wires, better airflow, a bit more expensive.
Different from non module as cables or wires from the supply to each component on the board are not permanently attached.
Wattage rating
When wattage needs of each device and of the motherboard and CPU are totaled you will know that the power supply must provide.
Must make sure maximum capacity isn’t exceeded.
Provide between 250 watts and 12,00 watts.
