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ATX 450W PSU is NOT actually 450W??

Last response: in Components
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January 18, 2012 4:56:38 PM

Hi there,

I recently bought a lovely tower with great specs and 'what I thought' was a 450W power supply. It came with a 6450 graphics card which is good but not good enough for my needs so I got my eyes set on the Radeon 5770 which requires a 450W power supply.
Only thing is I spoke to the guy who put together my system and he said even though my PSU is a 450W, it doesn't actually give out that much power? And if I wanted to upgrade my graphics card i would have to upgrade the PSU.
Does anyone know what the guys trying to say?
Is there such a thing as a "real power" PSU?
Any recommendations on what PSU to run the graphics card?

I know to some this might be an easy question but I'm quite new with these things.
Thanks for your help.

Chris :bounce: 


ps. heres my system specs:

Processor (CPU): AMD Bulldozer FX-4 Quad Core 4100
3.60Ghz (3.8Ghz Turbo Mode)
4 CORES Black Edition Perfect For Overclocking
Motherboard: ASUS M5A78L-M USB3 With AMD 760 Chipset
Supporting Quad & SIX Core CPUs & DDR3 Memory
Memory: 4GB DDR3 1333Mhz PC10666 DUAL CHANNEL KIT
Hard Drive: 1TB SATA2, 7200 RPM
Optical Drive: SONY 24XDVD+/-RW Lightscribe & Dual Layer
Graphics Card: ATI Radeon 6450 1GB Graphics Card
Direct X11 With VGA, DVI & HDMI Outputs
Case: COOLERMASTER Elite 330 Black Tower Case & 450W PSU
Connections: 8 x USB2.0 Inc 2 USB3.0, Gigabit LAN 10/100/1000 & 7.1 HD Audio
1 x PS/2 Ports, 1 x Optical S/PDIF Port

More about : atx 450w psu 450w

a c 111 ) Power supply
a c 109 U Graphics card
January 18, 2012 4:58:31 PM

There are power supplies that are rated at say: 650w, but in reality can only output 450w. Such as Raidmax and cooler master gx power supplies. Companies you want to buy are corsair, antec, seasonic, and xfx. What is your budget for a power supply? Are you planning on running crossfire?
January 18, 2012 5:01:48 PM

Crossfire is something I might look in to one day but for now I just want a half decent graphics card like the 5770 to run games like COD and Old Republic.
I have seen many PSU's for cheap on ebay but they look dodgy and might just be the same as the one I've got. My budget is around £40 I guess..
Related resources
a c 111 ) Power supply
a c 109 U Graphics card
January 18, 2012 5:02:16 PM

Corsair cx 500w.
January 18, 2012 5:06:36 PM

Excellent thanks for your help.
a c 274 ) Power supply
a b U Graphics card
January 18, 2012 5:10:53 PM

He was probably referring to the fact that the psu is 450W max power output not continuous.
I'll assume it came with the case and if it's a CM Real Power unit = old inefficient design without a PCI-E 6pin power.
He's giving you good advice.
What's your psu budget?
a c 274 ) Power supply
a b U Graphics card
January 18, 2012 5:23:27 PM

Quality units.
Cooler Master GX Series 80PLUS Bronze 450W = 5yr warranty
http://www.overclockers.co.uk/showproduct.php?prodid=CA...
Corsair CMPSU-500CXV2UK =3yr warranty
http://www.amazon.co.uk/exec/obidos/ASIN/b005851o16/gei...
OCZ 550W PSU - ZS SERIES =3yr warranty
http://www.micom.co.uk/products.asp?partno=OCZ%2DZS550W...
XFX 450 Watt Core Edition =5yr warranty
http://www.dabs.com/products/xfx-450-watt-core-edition-...
January 18, 2012 5:45:24 PM

Your right it did come with the case and it doesnt have a 6 pin PCI-E. Your suggestions are great thank you. I always knew he was giving me good adive :p 
The Corsair looks like a good one for me.
a c 104 ) Power supply
a b U Graphics card
January 18, 2012 5:59:05 PM

For powersupply info in future, check out jonnyguru, great psu review site
and the CX500 is a great little psu,
try ebuyer.co.uk,
scan.co.uk
dabs.co.uk
Pixmania.co.uk
box.co.uk
as well as amazon and egay to find the best price :) 
Moto
!