Power rating of your computer

MisterEd said:

The power supply rating is a theoretical maximum output power for the power supply. The computer you use with it will probably use a lot less power than that.

Ya, but i also have a monitor, speakers and printer all to the wall socket.

Ghot said:

And in the US the wall outlet is 15 amp/110v , or 20 amp/110v. Most are 15amp.

I know, i brought a asus monitor from us and it came with a fuseless us plug, i think it's 10a 110v.

Berton said:

Right, I have circuits for both. When I started setting up my computers some 25 years ago I ran a separate/additional 20Amp circuit for them, partly because I had a LaserJet printer and common rule-of-thumb is not to use them on a power bar.

I also use a separate 20a circuit to my wall socket.

Geneo said:

Your system isn't going to draw anything near 1000W and way less than 10A. Where did you get that? Being generous it will pull 400W tops, assuming a slight overclock. Otherwise 300-350W. Your power math doesn't add up either.

I try not to hit 13a 1300w (assumed) for my wall socket. I'm not good at math. I take reference from various electrical items example trail socket with max input of 10a 1000w @230v and water heater 30a 3300w 240v and more.

MisterEd said:

If the OP has an Intel Core i9 or a AMD Ryzen 9 CPU paired with an Nvidia RTX 3090 GPU they might need a 850 or 1000 watt power supply.

I think a 1000w psu will be better for I9 or R9 cpu with rtx3090, which i can't afford financially and to provide power to it.

In the United States regular outlets are 120V. Electric ranges, electric clothe dryers, and some air conditioners require a 240V outlet.

Only outlets near water have GFCI protection (circuit breaker). Since my house is old none of my outlets have this protection.

A normal 120V circuit where I might plug in a TV, lamp, or computer has a 20A circuit breaker.

A typical power strip is rated at 125V @ 15 Amps. The ones I have have a 15A resettable circuit breaker.

I have two gaming desktops plus a printer hooked up to one circuit. Note the circuit has four outlets.

Desktop 1: Corsair RM750i (750 watts)
Desktop 2: Antec TruePower (new) TP-650 (650 watts)

Each computer draws less than half of the power supplies rated wattage.

Using rough calculations the power used by each computer for 120V:
Idle = 80 watts = ~0.7 Amps
Full load = 250 watts = 2.1 Amps

If you add two monitors and a printer that might add about 60 watts (0.5A).

That means even together at full load the two computers draw less than 5 Amps.

Geneo said:

A OC 3090 could possibly hit 400W, and OC i9 300-350W. That is 750W total both running full load and OC. You would be good with an 850W PSU. The manufacturers of 3090 GPU cards (Asus, Gigabyte, etc), recommend PSU power of 750 or 850W, depending on the card - you do not need 1000W.

Sure these power supplies will handle this but I think it is better to be a little conservative and opt for a bigger power supply. It is probably ideal to at full load to draw 70-80% of the power supplies max rating. The power supply will not only run cooler but will probably be more efficient.

The fan in my 750 watt power supply is normally not running. It only comes on when the load is above a certain amount.

I read through all your inputs, i will post if there is anymore doubts. Thanks.