How do I calculate amp rating on dual +12V rails? - Techist - Tech Forum

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Old 11-11-2009, 07:50 AM   #1 (permalink)
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Talking How do I calculate amp rating on dual +12V rails?

Hi All!

I'm considering upgrading my graphics card. I don't really use my computer much for gaming but I want something that provides dual DVI support for my job and, maybe, plays Civ 4 :-P

Here's the card I'm considering buying:
Newegg.com - EVGA 01G-P3-N959-TR GeForce 9500 GT 1GB 128-bit GDDR2 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Desktop Graphics / Video Cards

Card Requirements: 350 Watt PSU with +12v rating of 18 amps

My current power supply:
420 Watts
3.3V/17A
5V/25A
12V1/14A
12V2/14A

It actually doesn't list any max amperage or any other information, really.

Characterizing based on the newegg PSU calculator, I have
Intel Core Duo 3.00ghz
Regular Motherboard
DVD-RW
Harddisk - 7,200 RPM

according to the newegg calculator, even adding this graphics card I'd only need a 282 watt system (308 watt if it turns out I have a high-end motherboard which I doubt).

But my power supply sticker has left me wondering - I'm just not sure how to figure out whether my amp rating is high enough, since it's a dual rail 14V setup.

Thank you all in advance for your thoughts.
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Old 11-11-2009, 12:19 PM   #2 (permalink)
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Default Re: How do I calculate amp rating on dual +12V rails?

Quote:
Originally Posted by Oaxaca View Post
Hi All!

I'm considering upgrading my graphics card. I don't really use my computer much for gaming but I want something that provides dual DVI support for my job and, maybe, plays Civ 4 :-P

Here's the card I'm considering buying:
Newegg.com - EVGA 01G-P3-N959-TR GeForce 9500 GT 1GB 128-bit GDDR2 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Desktop Graphics / Video Cards

Card Requirements: 350 Watt PSU with +12v rating of 18 amps

My current power supply:
420 Watts
3.3V/17A
5V/25A
12V1/14A
12V2/14A

It actually doesn't list any max amperage or any other information, really.

Characterizing based on the newegg PSU calculator, I have
Intel Core Duo 3.00ghz
Regular Motherboard
DVD-RW
Harddisk - 7,200 RPM

according to the newegg calculator, even adding this graphics card I'd only need a 282 watt system (308 watt if it turns out I have a high-end motherboard which I doubt).

But my power supply sticker has left me wondering - I'm just not sure how to figure out whether my amp rating is high enough, since it's a dual rail 14V setup.

Thank you all in advance for your thoughts.
I think you meant to type dual-12 V at the end. You would need a supply to cover the two rails along with everything else plus a little headroom is better of course. Here is a caculator you can try:

http://extreme.outervision.com/psucalculatorlite.jsp
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Old 11-11-2009, 08:24 PM   #3 (permalink)
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Default Re: How do I calculate amp rating on dual +12V rails?

420W is enough for a dualie + 9500GT
unless you have a POS power supply, then it's NEVER enough for ANYTHING
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