Power in the 12v rail

[nunogand]

Hi all again.

I just bought a PII 720 BE and a Gygabyte MA78G Mobo. My doubt now is the PSU.

I'll probably OC just a little bit (the max amount that the stock cooler can handle) and only b using the integrated graphics.

What is the minimum power needed in the 12v rail? 16A? 20A?

Thanks.

 

[WR2]

Are you afraid to tell us what PSU you're actually using?
Running any HDDs or a DVD burner? Case Fans? They use the +12V rail too.
You might as well list everything the PSU is powering

 

[WR2]

I forgot to ask - how old is your PSU? They can loose the ability to provide full rated power over time.

 

[nunogand]

I just bought the cpu and mobo. Still waiting for a SATA hard-drive (500Gb) and RAM (2+2Gb). Will also be using an old DVR-RW and IDE harddrive (for storage). Maybe 1 or 2 fans...

I haven't a clue about PSU.

 

[Outlander_04]

a 4-500 watt psu will be fine .

Pick a quality brand .

 

[Horhe]

I recommend Corsair VX450. It has 80+ efficiency, it's dead silent and has 33A on the +12V rail, which is more than enough for your build. If you can't find this PSU, or don't like Corsair, search for a similar Seasonic, OCZ or PC P&C PSU. They are all quality brands.

 

[geofelt]

Power requirements are mostly determined by the vga card configuration. With integrated vga, you only need minimal wattage.
Good quality units are from corsair, seasonic, antec, PC P&C, and some others.
How about this PS P&C silencer 370 for $49.99 with 27a on the 12v rails?
http://www.newegg.com/Product/Product.aspx?Item=N82E16817703018

 

[Shadow703793]

I recommend Corsair VX450. It has 80+ efficiency, it's dead silent and has 33A on the +12V rail, which is more than enough for your build. If you can't find this PSU, or don't like Corsair, search for a similar Seasonic, OCZ or PC P&C PSU. They are all quality brands.

+1. Or if on a budget get a Corsair 400CX.

 

[nunogand]

But what should be the minimum wattage on the 12v rail for my system? Are 18A enough?

 

[4745454b]

With no actual GPU, you can probably use a quality 300W, or an 400W if its old/suspect. Its hard to find a PSU that has less then 16A on the 12V rail, your system as listed probably needs less. I'm not sure how many amps the 720 needs, 14A would do it in my opinion.

I also vote you go out and get one. You still haven't told us how old it is, and if it lacks the plugs you need for the new motherboard, its a good indication that you need something newer. If your buying a new mobo and CPU, RAM and 500GB harddrive, why risk losing it all to a power spike/bad PSU? People have already listed some $50 quality PSUs, whats another $50 after spending what you spent already?

 

[WR2]

I haven't a clue about PSU.

Try a little research?
Copy down the info on the data plate attached to the PSU.

 

[asymetriccircle]

P=VI i believe, so if you can find online somewhere what kind of power requirements your parts have divide that by 12v to get the current you need.