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A good PSU around 850W

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  • Power Supplies
  • Graphics Cards
  • Components
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Last response: in Components
October 11, 2011 12:03:12 PM

Hey folks,

I am looking to get a new PSU to support an NVIDIA GTX 580 3GB graphics card. The power requirements are only a 600W with at least 42A on the +12V rail but I have heaps of other devices connected so I was thinking something around 850W.

There seem to be a multitude of PSU's out there so I'm a bit overwhelmed.

Can anyone suggest a good one for around $100?

Thanks heaps!

More about : good psu 850w

a b ) Power supply
October 11, 2011 12:12:51 PM
a b ) Power supply
a c 143 U Graphics card
October 11, 2011 12:52:39 PM


Except for the Corsair TX, all the rest are non modular which is a kinda problem with some enthusiast users.
all the PSUs included are 750W, the OP needs a 850W PSU in case of upgrade.
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a b ) Power supply
October 11, 2011 12:59:07 PM

These are the based options in his price range. If you are looking for modular, you have to give on price or wattage. Also, the Antec is 900W, and a very good psu, and the XFX is an 850. He needs some sort of 80+ Cert if he is building a gaming rig, as he needs stable power/voltage the brands also go up as what companies he should be using.

Quite frankly, i think a $100 budget is a little low for what you want, but this is what is out there. If you can spend an extra $50-$75, the market opens up.

These are $100 budget psu's...not "modular 800W+, 80+ Cert" psu's.
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a c 275 ) Power supply
a b U Graphics card
October 11, 2011 1:07:01 PM

casualbuilder has some really good units listed no crap among them.
Here's some others.
OCZ Z-SERIES 850W 80+ Gold -$79.99 USD/after mir
http://us.ncix.com/products/?sku=50802&vpn=OCZZ850M&man...
Corsair Enthusiast Series TX750M - $119.90 USD
http://us.ncix.com/products/?sku=62826&vpn=CP%2D9020003...
XFX 850W PRO850W XXX Edition Single Rail - $109.99 USD/after mir
http://us.ncix.com/products/?sku=62223&vpn=P1850BNLG9&m...


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a b ) Power supply
October 11, 2011 2:13:35 PM

Id be wary about Cooler Master psu's. Although the Silent Pro series is a great series, their company uses mediocre materials, and way too many manufacturers.
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October 11, 2011 2:17:33 PM

The Cooler Master looks suitable but I noticed in a review of the TPQ-850 it only gives 18A per 12V rail. I don't know much about PSU's but this sounds insufficient for the GTX 580 which requires 42A.

I do appreciate your help.
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a b ) Power supply
October 11, 2011 2:22:27 PM

the corsair would be your best bet...TX750M series. a great bang for your buck, and will be sufficient for anything you need with that GTX580.
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a b U Graphics card
October 11, 2011 2:44:39 PM

Just checked geforce website and says the GTX 580 draws 244W at maximum..
It means, 20,3A in 12V just for VGA.
So the 600W PSU, (IMO with at least 35A in 12V) should be ok
If u dont want a future proof PSU get a quality 600W PSU. It's enough for the system
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a b U Graphics card
October 11, 2011 2:45:59 PM

35A in 12V = 420W = 270W for VGA + 150W for CPU
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October 11, 2011 2:52:49 PM

@vitornob
On the website I read the GTX 580 3GB needs atleast 600W, but if you're right I could just keep my asus 700W. However I do want to future proof in case I want to setup SLI later so I think Ill get the TX750M. I'm currently reading a review on the 850W version but that would be overkill, right?
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Best solution

a b ) Power supply
a c 143 U Graphics card
October 11, 2011 3:05:05 PM

let's clarify some concepts.....,
first of all the TPQ-850W new revisions is rated @ 25A per 12V rail

let's assume you get the 18A one lets do some calculations

You see the Combined Watt column? Notice the 764W rating for the +12v rail. This is the combined +12v power.
764W / 12v = 64A
So that's 20A above NVIDIA's recommendation. NVIDIA's PSU recommendations are for a whole system powering a GTX 580 not a GTX 580 alone. To get a good estimate on how much power a GPU draws, look at the TDP rating (Thermal Design Power). This is actually a rating of the maximum heat output of the card, but the power consumption is always extremely close to the TDP. So the GTX 580 has a 244W TDP.
244W / 12v = 20.3A
So the GTX 580 alone only needs about 20A of power. Since your PSU has 4 ×12v rails you should have decent distribution. Be sure to split the GPU up onto separate rails if you can.
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a b ) Power supply
October 11, 2011 3:05:40 PM

244W is correct for the gpu, the cpu is 125W (140W if you are looking at the BD), plus another 100W for the rest of the system to be safe. so, total watts you need is roughly 570W at max consumption. I would recommend the HX850 if you ever want to upgrade to an SLI configuration with GTX580's. It will be close, but the unit will hold it, as absolute max tdp would be 725W-800W depending on drives and hdd's you have installed. My advice, go with the HX850, but the HX750 would be enough if money is truly an issue.
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a b ) Power supply
a c 143 U Graphics card
October 11, 2011 3:11:37 PM

casualbuilder said:
Id be wary about Cooler Master psu's. Although the Silent Pro series is a great series, their company uses mediocre materials, and way too many manufacturers.

CoolerMaster Silent pro series are one of the bests ever, every famous brand has it's own high end products and small market segment products. for eg. Antec is known for it's True Power series, NZXT are known for their Hale90 PSUs, Thermaltake are known for its Toughpower series, CoolerMaster GX, Extreme series have awful reviews and not recommended for CF/SLi setups. Same thing for OCZ, it's ModXtream and StealsXtream are creepy PSUs Unlike the Fatalty and Z series.
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October 11, 2011 3:12:28 PM

Thanks ilysaml, I understand now.

and casualbuilder, I think I will go for the TX850M as SLI will def be a possibility down the track. I also have 3 SSD's, a HDD, Bluray and DVD plus a TV Tuner and a Wacom Tablet on top of the usual stuff. And its only $30 more than the 750.

Thanks all for your input.
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October 15, 2011 3:00:24 AM

I had a second look at my current PSU and by my calculations it will actually be enough to support my system with the new GTX 580 3GB - Just looking for a second opinion.

On top of the new card, my PSU will have to support these extra devices:

Bluray drive
DVD drive
Wacom Tablet
TV Tuner
3 SSD
1 HDD

plus the regular stuff, CPU, 16GB RAM, mouse, keyboard, speakers etc.

the MAIN PSU specs:

(AOPEN AO700-12AE6)
+12V1 +12V2
30A 30A

MAX COMBINED POWER (Of +12V1 and +12V2): 648W
TOTAL POWER: 700W

Based on these figures, would you think this PSU of mine will handle everything?

I will definately need a better PSU down the track so I can SLI multiple cards, but if I can avoid the hassle and expense now I will.

Thanks everyone for your help so far.
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a b ) Power supply
a c 143 U Graphics card
October 15, 2011 12:41:09 PM

yes it should be very sufficient to your rig, but the problem is that AOpen is not a famous brand so I'm not sure if it delivers the total of 700W or not.
usually any 700W has a 80 plus certificate.. does it have ?
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October 15, 2011 1:03:26 PM

yes, I believe it does ("80 PLUS" in large font within a rectangle) on the PSU.
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a b ) Power supply
a c 143 U Graphics card
October 15, 2011 2:35:11 PM

so you are good to go
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October 15, 2011 2:36:57 PM

excellent. thanks for all of your help, ilysaml!
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October 21, 2011 11:58:21 PM

Best answer selected by Trist_58.
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October 23, 2011 12:57:06 AM

I picked up a Silent Pro Series 850w for $89.99 a couple weeks back, wish I wouldn't have gone the cheap route, they had the 1000w for $125...I hope I didn't make a mistake, everything I read about them sounded positive. They are also supposed to be really quiet which was a big reason I chose the Coolermaster in the first place.
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a b ) Power supply
a c 332 U Graphics card
October 23, 2011 8:40:42 AM

This topic has been closed by Mousemonkey
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