Is an ATX 450W PSU good enough for an ATI HD4850 video card?

My specs at the moment:



Manufacturer:

BIOSTAR Group

Processor:

Intel(R) Pentium(R) Dual CPU E2180 @ 2.00GHz (2 CPUs), ~2.0GHz

Memory:

2 GB DDR2-800 @ 400 MHz

Hard Drive:

Seagate Barracuda 7200.9 ST3160212A ATA, 160 GB

Video Card:

NVIDIA GeForce 8400 GS, 512 MB, OC'd @ 521/1302/504 (yeah, it sucks, that's where the 4850 comes in)

Monitor:

Flatron W1934S, 19", 1440x900

Sound Card:

Realtek HD Audio

Speakers/Headphones:

MidiLand MX-5, 90W, 5.1 Speaker System

Keyboard:

A4Tech AntiRSI Model KBS-26

Mouse:

Genius Traveler 100; Model GM-050014P

Mouse Surface:

No idea, but pretty neat

Operating System:

Windows 7 Ultimate 32-bit (6.1, Build 7600)

Motherboard:

BIOSTAR PM4900-M7 FE

Computer Case:

DeLux MT302 Middletower ATX, 450W, silver & black



Also, how do I know how many amps on the 12V rails I have?|||I don't know what exact type of video you mean.



check on the manufacturer's website, for instance http://www.sapphiretech.com/presentation…



Under System Requirements it states:

450 Watt Power Supply is required.

550 Watt Power Supply is recommended for CrossFireX™ System.

1 X 75Watt 6-pin PCI Express power connector is required.

2 X 75 Watt 6-pin PCI Express power connector is required for CrossFireX™ system.

Certified power supplies are recommended. Refer to http://ati.amd.com/certifiedPSU for a list of Certified products.



So 450W is just enough, considering the fact you won't be using a lot of hard drives or other hardware that consumes power.

You shouldn't just look at how much Watts you need, but also if the PSU has enough 6-pin connectors.



how much amps you have depends on the PSU, so check out the manufacturers website. For instance take my PSU: http://www.be-quiet.net/be-quiet.net/ind…

Under Technical Data you can find a drawing of the PSU with all connectors and rails laid out, with their voltages and ampere. There's also a manual and datasheet available with even more details about the various connectors etc.|||FYI:

Amount Volts x Ampere = Watt

do this for every rail and you get the total wattage the PSU can supply.

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|||450W is the recommended requirement, so I think it will work.|||I have the same question and have been investigating it all day.

But as someone else said, ATI recommends 450W as a minimum. So basically, its not ideal, but it'll do, so long as you don't overclock anything.



Here are the system requirements for that card:

http://www.amd.com/us/products/desktop/g…



And you'll see that it asks for a minimum of a 450W PSU, with 550W recommended, but generally, 450W will be fine, so long as it is a reputable PSU, for example a Corsair.



You can usually find out how many Amps on the 12V rail you have by opening the machine up and looking at the sticker on the PSU itself, although not all of them have a sticker. Some also may have a sticker on a surface of the unit which you can't see, which may require you to unscrew it from the case to have a look.

If you can;t find out after all that, try and find out what model your PSU is and do a Google search, you should be able to find out that kinda info.