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What power supply wattage do I need?

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September 8, 2012 1:14:11 AM

Hello,

I am looking for some advice on what wattage I need for the power supply of my new build, and if possible, some recommendations for some reasonably priced quality power supply models. My build is as follows:

Intel i5-3570k
Asus gtx 670 DC2T 2GD5
Asus P8Z77 V LK mobo
Seagate Barracuda 7200 rpm 2tb
2 sticks ddr3 ram
Pci nic
Zalman Z11 Plus HR1 case

Accounting for about 20% capacitator aging, what do you think a good psu would be? Thanks.

More about : power supply wattage

a b ) Power supply
September 8, 2012 5:13:20 AM

650w gold from seasonic/xfx would serve
a c 111 ) Power supply
a b Ĉ ASUS
September 8, 2012 5:22:33 AM

Any reasons why you are getting a V-LK motherboard?

For the PSU, do you have a budget? Are you looking to SLI in the future?
Related resources
September 8, 2012 6:38:37 AM

amuffin said:
Any reasons why you are getting a V-LK motherboard?

For the PSU, do you have a budget? Are you looking to SLI in the future?



I got the V-LK mobo on a deeply discounted bundle deal with the 3570k and I figured that it would be a good way to keep my sli options open for the future. However, as I don't plan on using sli in the very near future, I'd kind of like to get an estimate on a good psu hopefully under $100 for non-sli purposes, and then maybe another estimate for a psu (of maybe around the 80 plus bronze range) that I could consider if I was to sli two of the asus 670's. That way, I could get an idea of the difference in prices between an sli and a non sli psu.
September 8, 2012 7:17:57 AM

No 450W too less.
September 8, 2012 7:18:56 AM

Well, without SLI you'd get away with a decent 550W PSU (like the GX550 from cooler master) or as amuffin posted that Seasonic M12II 620.

However, if you want to SLI that card you'd need 4 PCIe 6-pin cables, so you'll likely have to look at something like:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

(the second link is a seasonic PSU with a 15% off promo code that ends in 2 days!)

There are others, of course. Just filter the results with 4x(6+2) pin PCIe or 2x6pin+2x(6+2) pin.
a c 111 ) Power supply
a b Ĉ ASUS
September 8, 2012 7:31:33 AM

ojas said:
Well, without SLI you'd get away with a decent 550W PSU (like the GX550 from cooler master)

NO! :pfff: 
September 8, 2012 7:32:29 AM

ojas said:
Well, without SLI you'd get away with a decent 550W PSU (like the GX550 from cooler master) or as amuffin posted that Seasonic M12II 620.

However, if you want to SLI that card you'd need 4 PCIe 6-pin cables, so you'll likely have to look at something like:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

(the second link is a seasonic PSU with a 15% off promo code that ends in 2 days!)

There are others, of course. Just filter the results with 4x(6+2) pin PCIe or 2x6pin+2x(6+2) pin.


And should I probably stick with corsair and seasonic, or are there any other brands that you can recommend?
a c 111 ) Power supply
a b Ĉ ASUS
September 8, 2012 7:33:08 AM

XFX, Enermax, Antec, etc. etc.
September 8, 2012 9:09:04 AM

Amuffin: :D  i own that PSU, and another friend of mine also bought that recently at my suggestion, been using it for around a year now without issues. Stable voltages and all. Same for the other newer unit.

But yeah, i'd choose seasonic, corsair or antec over a CM for a high end build like yours, lordelite, just to be safe.

I'm in India, and at that time i didn't have too many choices for the money i was willing to spend. Neither do i have a high end build lol.
a b ) Power supply
September 8, 2012 9:50:40 AM

You can also use FSP reliably, and Rosewill Capstone. Aurum Gold by FSP is the best I know. Also, isn't that supposed to be an i5?
September 8, 2012 10:17:39 AM

Yeah Aurum's good too apparently, and FSP is an OEM so...they make PSUs for other brands as well. No clue about Rosewill.

Yup it should be i5-3570K...
a b ) Power supply
September 8, 2012 11:08:11 AM

450W is fine for non SLI.
a b ) Power supply
September 8, 2012 12:26:36 PM

PC Power and Cooling is also good.
a b ) Power supply
September 8, 2012 1:17:34 PM

Those recommendations are always inflated due to the amount of crap PSUs on the market. 450W is fine in real life.
a b ) Power supply
September 8, 2012 1:53:57 PM

FinneousPJ said:
Those recommendations are always inflated due to the amount of crap PSUs on the market. 450W is fine in real life.

True,a 380w s12ii will run one card. Of course, there's no need to cut it that close.
a c 158 ) Power supply
September 8, 2012 2:48:56 PM

Finneous is absolutely correct that a good 450W PSU will work for a single GTX 670. In a system with a single GTX 670 and a power-hungry, highly OCd i7 965 the system drew 279W at full load: http://www.guru3d.com/article/geforce-gtx-670-review/8 The i53579K will draw less power even after a significant OC. The issue will be finding a 450W PSU with two 75W 6-pin PCIe power connectors; there are a couple but not that many. A couple of them:
1. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
2. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
For that Price you can get a higher rated 80+ Bronze PSU like the Seasonic S12II-520: http://www.newegg.com/Product/Product.aspx?Item=N82E168... ~$70 with a 15% instant discout taking it under $60. Great deal and the route that I would recommend for a single GTX670 right now.
a c 158 ) Power supply
September 8, 2012 2:58:44 PM

A few options for an SLI of the GTX670:
1. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
2. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
3. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
4. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
5. http://www.newegg.com/Product/Product.aspx?Item=N82E168... There is a great deal on this PSU that makes the price ~$70 - awesome PSU especially for that price and this is the route that I would go for the SLI if you can get it for $70.
September 8, 2012 2:59:09 PM

Interesting. My Core 2 Quad with a GTX 560 takes 260w at almost full load with no OC.

Anyway, won't there be efficiency considerations? PSUs usually have max efficiency at around 50%...
September 8, 2012 3:04:39 PM

Read an excellent review of that Lepa PSU btw.
a c 158 ) Power supply
September 8, 2012 3:07:59 PM

The previous genetration of GPUs are less efficient than the 600 series GPUs; it doesn't surprise me that the 560 nearly matches the 670, but a direct comparison isn't really good....the system configs are different.

The sweet spot for efficiency is typically from 40-70%. Good quality PSUs have nearly a flat high efficiency above about 20% and a few % up or down means savings of cents to a few dollars on an annual basis.
September 8, 2012 3:38:59 PM

Rugger said:
The previous genetration of GPUs are less efficient than the 600 series GPUs; it doesn't surprise me that the 560 nearly matches the 670, but a direct comparison isn't really good....the system configs are different.

The sweet spot for efficiency is typically from 40-70%. Good quality PSUs have nearly a flat high efficiency above about 20% and a few % up or down means savings of cents to a few dollars on an annual basis.

Yeah...found it interesting because the system you referred to was OC...lol i saw my idle power drop from 97w to 60w when i switched from DDR2 and 9600GT to DDR3 and GTX 560...

Fermi was notorious for its power consumption anyway.

Efficiency usually follows a parabolic curve, though.


a c 243 ) Power supply
September 8, 2012 3:56:20 PM

GREG0RA said:
http://images10.newegg.com/BizIntell/tool/psucalc/index...

^Very simple, but easy to use calculator for future use. Plug in the hardware, and out comes a wattage! I would overestimate by 50-100 watts when using this though.

It already over-estimates, no real point in adding even more, unless you're looking at purchasing a low quality unit that can't do what it says to begin with
a c 158 ) Power supply
September 8, 2012 4:37:07 PM

The only reason it got a 9 was the 4 it got for aesthetics.
a c 243 ) Power supply
September 8, 2012 4:39:21 PM

Rugger said:
The only reason it got a 9 was the 4 it got for aesthetics.

Slap the guy that matters to
a b ) Power supply
September 8, 2012 6:56:51 PM

delluser1 said:
Slap the guy that matters to

Indeed. A nice backhand.
September 8, 2012 9:27:40 PM

Does it matter that the asus 670 I have uses just slightly less power that a reference gtx 680, or will that not make much of a difference?
a c 158 ) Power supply
September 9, 2012 1:26:56 AM

No big deal.
September 9, 2012 3:06:06 AM

Rugger said:
A few options for an SLI of the GTX670:
1. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
2. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
3. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
4. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
5. http://www.newegg.com/Product/Product.aspx?Item=N82E168... There is a great deal on this PSU that makes the price ~$70 - awesome PSU especially for that price and this is the route that I would go for the SLI if you can get it for $70.


I decided to go with the PCP&C 750w because it too is on sale for 70 bucks after rebate, and its only $10 more than the seasonic 520w psu that I could have used for non-sli purposes. Thanks - you and everyone else has been a great help.
a c 158 ) Power supply
September 9, 2012 3:20:38 AM

Glad we could help - enjoy a great PSU!
!