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Help me choose a PSU

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April 13, 2010 5:10:13 AM

Hi guys
I gotta really bad computer, and am upgrading....FINALLY :D . I need your help now on choosing a good power supply unit.
After doing a wattage calculation, I found out that I needed a 500 watt power supply (inc the new GPU). My problem is, which power supply should I go for.
I am upgrading to a new ATI Radeon HD 5870, so I am concerned about the rating on the 12V rails.
Furthermore, I am not overclocking anything and have no method of special cooling.
My budget is around US$ 110.
Thanks for your help.
Regards

More about : choose psu

a b ) Power supply
April 13, 2010 1:37:17 PM

This should serve you well:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Corsair is a reliable brand and provides a lot of power on the +12V rails

That being said, this is cheaper and still good:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
^I have the 600W version of this. It is modular and serves me well.

Both of course are probably a bit overkill but you didn't mention the rest of your system so better overkill than underkill. Plus overkill will allow for more efficiency and some room for upgrades to more powerful components. You could easily get away with the 400W corsair or the 500W OCZ modxstream though.
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a c 144 ) Power supply
April 13, 2010 2:06:00 PM

A 5870 needs about 16 amps. Figure 10 amps for the CPU. That's around 26 amps not counting anything else.

A 550 watt PSU would do, but it would be operating around 80% - 85% of capacity.

I agree with with ct and enzo. I'd put in a 650 watt PSU.
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April 14, 2010 3:33:20 AM

enzo matrix said:
This should serve you well:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Corsair is a reliable brand and provides a lot of power on the +12V rails


Thanks mate. Looks good. I'll go for it. The problem is, the price is sky high on electronic goods here, $150!!! That's why I wanted a 500 watt PSU, because its cheaper. Thanks anyway.

Not like I'm gonna buy this power supply, but what about a Tagan Stone 600W Power Supply. And I calculated the power supply requirements, and I need 470 Watts, according to the calculator.
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April 14, 2010 1:54:56 PM

First Off. A little manners goes a long way. Say please in your thread heading

jsc said:
A 5870 needs about 16 amps. Figure 10 amps for the CPU. That's around 26 amps not counting anything else.

A 550 watt PSU would do, but it would be operating around 80% - 85% of capacity.

I agree with with ct and enzo. I'd put in a 650 watt PSU.


26AMPS? Are you out of your mind? We had a LAN recently with 30 + Machines and that used about 25 AMPs on its own dedicated switch board. Im not trying to insult anyone but 26AMPs For 1 Machine is a Rather large server rack to me!

Good Luck And personally Gigabyte is king.
:D 

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a b ) Power supply
April 14, 2010 2:06:33 PM

fisshy said:
26AMPS? Are you out of your mind? We had a LAN recently with 30 + Machines and that used about 25 AMPs on its own dedicated switch board. Im not trying to insult anyone but 26AMPs For 1 Machine is a Rather large server rack to me!


188W is the max draw of the radeon 5870. 16Ax12V=192W
most high end CPUs are about 125W TDP. 12*10=120W

As for your 30 machines, you are taking that measurement from the wall. That means 120V. If 30 machines are drawing 25A total from 120V source that is about 3000W.
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April 17, 2010 7:15:16 AM

fisshy said:
First Off. A little manners goes a long way. Say please in your thread heading



26AMPS? Are you out of your mind? We had a LAN recently with 30 + Machines and that used about 25 AMPs on its own dedicated switch board. Im not trying to insult anyone but 26AMPs For 1 Machine is a Rather large server rack to me!

Good Luck And personally Gigabyte is king.
:D 


Well, my friend, it is a monstrous card.
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April 17, 2010 8:52:08 PM

Point Taken... (Woah)
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April 17, 2010 10:58:11 PM

I looked at some power supplies at CompUSA and the Antec's have the 80+ rating, which means that are very efficient. I would suggest a 600+ Watt Antec for your upgrade.
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a c 248 ) Power supply
April 18, 2010 2:11:24 AM

Here are the official power requirements for the ATI Radeon HD 5850 and HD 5870 video cards.


ATI Radeon™ HD5850 System Requirements:

PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard

500 Watt or greater power supply with two 75 watt, 6-pin, PCI Express® power connectors.

600 Watt or greater power supply with four 75 watt, 6-pin, PCI Express® power connectors for ATI CrossFireX™ technology in dual mode.


ATI Radeon™ HD5870 System Requirements:

PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard.

500 Watt or greater power supply with two, 75 watt, 6-pin, PCI Express® power connectors.

600 Watt or greater power supply with four, 75 watt, 6-pin, PCI Express® connectors for ATI CrossFireX™ technology in dual mode.

The power supply recommendations are for an entire pc system.

Corsair and Seasonic are two brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty. Lately we've been seeing a few other brands offering some high quality units. One example would be the Antec Earthwatts and the Antec TruePower New series which are major improvements over Antec’s older psu’s like the Basiq models.
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