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Will this PSU work for me?

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April 2, 2010 8:39:19 AM

Will this PSU cover all my needs? http://www.newegg.com/Product/Product.aspx?Item=N82E168...

It's a OCZ 850W PSU
It outputs: +3.3V@30A,+5V@30A,+12V1@20A,+12V2@20A,+12V3@20A, +12V4@20A,-12V@1A,+5VSB@3.0A

My Computer has:
i7 920
Mobo(still searching)
2 Ati 5850 (Crossfire)
6 GB of Ram
60GB SSD
1TB HDD
DVD Drive
5 fans(1x120mm, 2x140mm, 2x230mm)

This is my first time building a computer so I want to make sure everything works out perfectly. Someone told me to make sure the railings work out before purchasing a PSU, so I was wondering if someone could help me with that? Thank you very much.

More about : psu work

a c 144 ) Power supply
April 2, 2010 9:43:55 AM

It probably will meet your needs. A good 650 watter will meet your needs.

Having said that, I don't think I'd buy this one. Two reasons - I don't like the pricing. $200, on sale at $90, rebated to $60 is almost too good to be true. A fair price for a good 850 watt PSU would be around $130.

Second, you have no idea of what the total max 12 volt current capacity is. The PSU label is misleading because it doesn't tell you. I suspect that a 750 watt Corsair has more usable power:
Corsair 750TX (60 amp 12 volt rail)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

At any rate, it doesn't have independent 12 volt rails, so don't worry about that.
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April 2, 2010 11:52:25 AM

GamexStreams are fairly mediocre FSP built units filled with cheap Chinese/Taiwanese caps. If you're going to buy a high-end system like that, then you should buy a high end PSU to power it:

Corsair 750HX
http://www.amazon.com/Corsair-CMPSU-750HX-Professional-...

Corsair 850HX
(only price gougers have it in stock currently)

Seasonic x-650
http://www.ewiz.com/detail.php?name=PS-SSX650G&title=Se...

Seasonic x-750
http://www.ewiz.com/detail.php?name=PS-SSX750G&title=Se...

XFX 750w
http://www.provantage.com/xfx-p1-750b-cag9~7PINE0JL.htm
^ Best deal IMO

XFX 850w
http://www.provantage.com/xfx-p1850bcag9~7PINE0HP.htm

Note: I didn't use newegg because their prices are higher on all of those.
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Related resources
a c 248 ) Power supply
April 2, 2010 4:47:30 PM

Here are the official power requirements for the ATI Radeon HD 5850 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.

The recommendation is 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.
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April 2, 2010 7:40:32 PM

Thanks for the review guys, I really appreciate it. I do have another question, I don't if it's possible, but are you able to run a computer with two separate PSUs? Like for example to 500w?
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a c 148 ) Power supply
April 2, 2010 8:23:51 PM

I'd use an Antec EA-650 for $79 for twin GFX cards (9.0 jonnyguru performance rating)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...

or a EA-500 for $45 for one GFX card (9.5 jonnyguru performance rating)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...

Alternates:

Corsair 550VX for $79 after $10 MIR (9.5 jonnyguru performance rating)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...

Corsair 650TX for $89 after $10 MIR ... (No review on TX650 but TX750 gets an 8.5)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...

Given the price / performance ratings, the Antec's look like the easy choice here at today's prices. Of course if doing serious OC's (over 4 Ghz) and twin GFX, I'd move up in both size and quality to Corsair HX / Antec SG series. At this level the Corsairs will have the price advantage.
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a c 248 ) Power supply
April 2, 2010 8:44:49 PM

One large power supply is recommended.
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April 4, 2010 9:19:09 AM

JohnnyLucky said:
One large power supply is recommended.


Alright, I appreciate the help. One more question. I want to test out the fans in the case I just got, so i planning on using my brother's PSU that's in his computer right. To do that, where exactly do I connect the fan wires to on a PSU? That's the only part of a computer I've never really worked with.
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a c 248 ) Power supply
April 4, 2010 12:35:01 PM

Case fans can be connected to a power supply 4 pin molex power cable.

If the fan does not have a 4 pin molex connector, then an inexpensive adapter cable can be used. Here's one that can be used to connect up to four cases fans to one 4 pin molex connector:

http://www.frozencpu.com/products/8780/cab-163/FrozenCP...




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April 4, 2010 1:32:20 PM

Tested and working at my end. You can go ahead
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April 4, 2010 4:00:47 PM

JohnnyLucky said:
Case fans can be connected to a power supply 4 pin molex power cable.

If the fan does not have a 4 pin molex connector, then an inexpensive adapter cable can be used. Here's one that can be used to connect up to four cases fans to one 4 pin molex connector:

http://www.frozencpu.com/products/8780/cab-163/FrozenCP...


Ok so I think I get it, I'll find out in about an hour, but they seem to be where one side is male, and the other is female for each connection. can I connect all the fans to together, then have one connection to the PSU? If that makes sense.

And will the PSU be labeled where the 4 pin connection is supposed to go?

Sorry for all these questions, I just don't want to mess up now.

OH and all the fans have 4-pins(There are 5 fans)
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a c 148 ) Power supply
April 5, 2010 9:35:44 PM

You can gang them all together on one PSU Molex.
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April 9, 2010 7:13:09 PM

JohnnyLucky said:
Better deal:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Corsair is a brand that has 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.


I was thinking of getting that, it's just I have a $10 coupon that works on the Thermaltake PSU. My original plan was to spend $70 on a PSU, so I'm debating if I should wait longer for a better deal for a 750W
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a c 243 ) Power supply
April 9, 2010 8:22:46 PM

Just as well as any other good quality 750
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April 9, 2010 8:59:52 PM

So since this has 12V rails with 25Amps, will that be able to run 2 high end graphics cards? Not necessarily the two 5850s I suggested. As in, later on in the future if I want to upgrade my GPUs, will this be able to power them?
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a b ) Power supply
April 11, 2010 6:26:00 PM

not 2 nvidia cards you need least 850 watts for them but 2 ati cards will be fine
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