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Please recommend a PSU

Last response: in Components
December 25, 2009 11:22:19 PM

Hi there.

I would appreciate some help with picking a PSU for my new system. I dont have any special ones in mind.

My system:

Core i5 I5-750 8 MB
XFX Radeon HD 5850
Gigabyte GA-P55-UD4
Corsair XMS3 2 x 2 GB
PC Case: Antec Performance One P182

Nothing special to say about my harddrives. I got 2. A WD which name I cant remember, and a Raptor harddrive.

No fancy cooling, only stock coolers.

Thanks for your help :) 

More about : recommend psu

a c 248 ) Power supply
December 26, 2009 7:44:51 AM

If you are sure you will only be using one XFX Radeon HD 5850 video card, then the Corsair VX 550 would be an appropriate choice. It is a high quality power supply with a single large +12 volt rail rated at 41 amps. It can easily power a system with any single video card made. Corsair power supplies have a reputaion for high quality. They consistently earn high marks in technical reviews. They are stable, relaible, and come with a 5 year warranty. The VX550 is currently available for $70.35 after mail in rebate. Unfortunately shipping is not free this week.
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December 26, 2009 8:52:08 AM

First of all, thanks for your replys. And thanks for that nice list saint :) 

Johnny > According to ATIs site, HD5850 requires 2x6pin connectors.

That PSU you linked to got 1 x 6-Pin, 1 x 6+2-Pin. What does 6+2-Pin means? I've not that into PSUs
a c 248 ) Power supply
December 26, 2009 9:01:38 AM

The 6+2 pin PCI-Express connector can be used as either 6 pin or an 8 pin connector. The manufacturers came up with a way to cover both types of power connections with one cable.

The 6-pin is a 75 watt power connection. When using all 8 pins the 6+2 becomes a 150 watt power connection for power hungry video cards.

Here's a link to a typical 6+2 connector:
December 26, 2009 9:02:48 AM

Okay. So when it says that it requires 2x6pin 75 watt, then those are good enough? Its okay that its over 75 watt?
a c 248 ) Power supply
December 26, 2009 9:14:45 AM

Yes - almost!

6 pin = 75 watts
8 pin = 150 watts

For a video card requiring two, 75 watt, 6 pin, PCI-Express power connections you would plug in the standard 6 pin connector and the 6 pin portion of the 6+2 connector which keeps it at the standard 75 watts.

For a power hungry video card that requires an 8 pin connection you would plug in all 8 pins of the the 6+2 connector. The 2 extra pins increase power from 75 watts to 150 watts.
December 26, 2009 9:18:52 AM

Johnny beat me to it.......
December 26, 2009 9:50:16 AM

Does any of you have that Corsair PSU? I need a PSU which cables are long enough to go from the bottom of my PC case and to the top of the motherboard :)  My old PSU didnt have long enough cables for that :D 
a c 144 ) Power supply
December 26, 2009 9:50:28 AM

JohnnyLucky said:

6 pin = 75 watts that's 3 hot and 3 ground leads
8 pin = 150 watts that's 3 hot and 5 ground leads

This is a "Just when I thought I knew something about electronics ..." moment.

Can someone please tell me how adding 2 ground wires will double the available power from a connector? :o 
a c 248 ) Power supply
December 26, 2009 11:35:09 AM

jsc - I'm experiencing the same senior moment. I'm trying very hard to remember. Doesn't it allow for an increase current?

1 6-pin PCI-e connector is capable of drawing +12V up to 6.25A (75 watts)

1 8-pin PCI-e connector is capable of drawing +12V up to 12.5A (150 watts)

It is part of the newer PCI-Express Version 2.0 specifications. I also remember something about being able to unlock Overclock in CCC.

Thought I was going to fry my brain on this one. :lol: 
December 28, 2009 3:05:05 PM

Get Corsair HX620 or HX650.