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if you don't intend to crossfire in the future, 400 will do fine, if you do, get a 500watt

No I have no intention.But can you tell some model of 400 W but cheap not more than 50 $.

(05-09-2010 12:21 PM)Game Wrote: [ -> ]No I have no intention.But can you tell some model of 400 W but cheap not more than 50 $.

u can search for a thermaltake/ocz/crosair psu that has more than 30 amps so u can be ok if u ever upgrade (40 amps would be recomended and 500-600 watts for future upgrades like this one u cant do (u can find one for 60-70 euro) )

If I buy example 400 W psu.Is electricity runing trough it all the time.Even when hardware does not use extra power? I am asking because el.bill.

(05-11-2010 06:03 PM)Game Wrote: [ -> ]If I buy example 400 W psu.Is electricity runing trough it all the time.Even when hardware does not use extra power? I am asking because el.bill.

even if u have shuted down your pc electricity will run in it (2 little though) the more u use your pc the more power it needs and the less efficiency the psu has the more power it needs also (like u need 100 watts to run your pc with a psu of efficiency of 80% u will need 120watts +- to create those 100 watts your pc needs)

if i use 400 watts psu and everything draws 250 watts from psu.Will psu then draw 400 watts from el.socket on the wall or 250 w?

even if u use 1200 watts psu the power u will use is the power your needs. if pc needs 250 watts then it will need to "take" from the wall socket 250 + the difference from efficiency as i said if it has 80% efficiency it will take from the wall 250 and 20% of that 250 = 300 watts. u dont need to get in those complex things lol

That's because I want to know when I take bigger watt psu.Thx

I thoughted that PSU drains all the time it's full power,now I am relived I was wrong.

The PSU only draws as much as the computer needs, or slightly more. Never less, because that just wouldn't make sense.

Power supplies are rated by their efficiency, so a 90% efficient supply means 90% of the power pulled from the wall is used by the system; leaving 10% to be carried off as waste heat. A PSU that pulled 400 watts for a 200 watt load would be 50% efficient, and in the world of power supplies that's absolutely garbage. Cheaper supplies may be as low as 75%, but a good PSU is easily 85% and up.



Aaaand I finally got around to reading the replies and iakoboss7 has the right idea.