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Wattage of graphic card and psu

Last response: in Graphics & Displays
December 10, 2012 6:05:35 PM

I know that you guys are probably mad at me, because this question appears everywhere on internet! But yust to be sure! I have max 300W psu and I have to buy a new graphic card. I have this in my mind:
ATI radeon 5450 1GB, but recomendations says taht I need at least 400W psu! I've heard alot about AMD overstating the power requirements of their lower-end cards. My old graphic card:

ATI radeon HD 2350:

ATI radeon HD 5450:

5450 uses yust 1 wat less than 2350!!!! :o  WTF Where's point?
I have intel core due 2.4Ghz, 2 sticks of 1GB DDR2 ram.
I would like to finish this topic once and for all... TNX

Best solution

a b U Graphics card
December 10, 2012 6:46:40 PM

The 5450 only draws like 20 watts max. I dont know what you have for a CPU but the most it could possibly draw is like 125 watts, throw in the board, drives and fans and stuff, and your at 150-175 max draw. Now add in the 5450 and your still below 200 watts.

I would not waist time on the PSU upgrade.

On a side note the 6450 only costs about $10 more uses only about 18 watts of power and is a good bit faster. I would grab one of those if you can.
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December 10, 2012 6:50:26 PM

hmm.. I'll probably go for better psu and better 6450. tnx
December 10, 2012 6:52:41 PM

You have no reason to upgrade your power supply for that card. It has no PCIe 6- or 8-pin connectors, thus it will be powered through the connector on your motherboard. 300 watts is more than enough to run the card with that system.
a b U Graphics card
December 10, 2012 6:56:27 PM

Just looked for a core 2 2.4 there is
the e6600 is a 65 watt part
the e4600 is a 65 watt

Your system with new video card will never draw more than 175-200.
December 10, 2012 6:56:56 PM

Hmm maybe ur right! But still i checked and o got only 19Amps on 12V rail! 5450 needs 22 amps and 6450 needs 25 amps... so :S
December 10, 2012 6:59:03 PM

And i'm still confused! wats = voltage * amps
How do you do that? 12V * (let's say) 20A = 240W?
a b U Graphics card
December 10, 2012 7:01:07 PM

Dude i dont know where you got those numbers???
5450 draws 20 watts at 12 volts.
20watt / 12volts X 1.66amps.

Its your money, new stuff is always fun to install, and hey fun is what its all about!
December 10, 2012 7:04:28 PM

yeah :D  Ill buy new psu yust to be sure nothing goes wrong!
December 10, 2012 7:33:15 PM

Best answer selected by jagdtiger12cm.