Why Do We Need 450 Watt PSU when it convert the power to 12v and our CPU takes only 1.2v or above for overclocking only?
- Thread starter bharatx1
- Start date
dudio
Illustrious
- Apr 26, 2015
- 2,534
- 63
- 37,240
You should educate yourself through some Google searches.
I know the reason behind it, but it would take too long to try to even half explain.
Start with this video and do some other searches. Let us know if you have a better basic understanding !
https://www.youtube.com/watch?v=mvuHsu8S6v8
I know the reason behind it, but it would take too long to try to even half explain.
Start with this video and do some other searches. Let us know if you have a better basic understanding !
https://www.youtube.com/watch?v=mvuHsu8S6v8
P = U * I
Ie... power[watts] = voltage[volts] * current[ampers]...
Lower the voltage to half, increase the current twice and you'll have same power.
Point is, CPU takes "1.2V", but at "100Amps"... which makes it take 120W (example)
Then, RAM comes, motherboard components, network card, disks/ssd and finally graphic card... which, in high perf forms can take up to 250W.
Also, bear in mind that PSU rating is usually it's overall max performance, while the sweet spot efficiency wise is about 40-60% load... so your 450W PSU will give you it's best at about 225W load.
Also, PSU doesn't convert only to 12V (it's only for the yellow cables), it also converts to 5V, 3.3V and -5V, for different purposes of different devices. Components like CPU and GPU have their own power management that coverts to their required voltages (which varies over time depending on mode).
Ie... power[watts] = voltage[volts] * current[ampers]...
Lower the voltage to half, increase the current twice and you'll have same power.
Point is, CPU takes "1.2V", but at "100Amps"... which makes it take 120W (example)
Then, RAM comes, motherboard components, network card, disks/ssd and finally graphic card... which, in high perf forms can take up to 250W.
Also, bear in mind that PSU rating is usually it's overall max performance, while the sweet spot efficiency wise is about 40-60% load... so your 450W PSU will give you it's best at about 225W load.
Also, PSU doesn't convert only to 12V (it's only for the yellow cables), it also converts to 5V, 3.3V and -5V, for different purposes of different devices. Components like CPU and GPU have their own power management that coverts to their required voltages (which varies over time depending on mode).
bigpinkdragon286
Splendid
- Oct 3, 2012
- 4,648
- 35
- 28,590
thanks buddy
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