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More questions than i an fit in one line about PSUs and SLI

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February 21, 2012 3:51:53 AM

I want to SLI two GTX 560 TIs... specifically two of these:

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

I failed hard when I bought the power supply. It said SLI Ready but I didn't realize the GPU was gonna have 2 6-pins, and they ended up using all my PCI-E power plugs.

700w seems more than efficient for that config. I just don't have the connectors... but I do have a web of unused SATA connectors. The first thought was to try and get two of these adapters (SATA to 6-pin) :

http://www.ebay.com/itm/200712060306?ssPageName=STRK:ME...

This is where things get tricky. My PSU says ||| +5v / +3.3v = 150w ||| +12v1 / +12v2 = 552w ||| -12v = 3.6w ||| +5Vsb = 12.5w

pic here:

http://i81.photobucket.com/albums/j201/cantstandya/PSUi...

I'm not really sure what all these numbers mean. Which components draw power from which output source? And are the SATA cables going to transfer enough juice through the 6-pin adapters to keep the GPU alive? If the two GPUs draw 200w each using the +12 outputs alone, I'd be good, but I don't know what else is going to be pulling power.

According to the first PSU calculator I could find on Google my max power consumption (worst case scenario) OC'ed w/ SLI would be 554w.

Does anybody else out there have faith that this is going to work?


House burned down or not, I'm trying this junk. The PSU's relatively new and I refuse to give up on it.

So what's the worst that could happen? --No I'm asking, really, what's the worst that could happen? System doesn't have enough juice and keep them alive and keeps shutting down? If so I can deal with that.


If I've gotta buy another one I'll get it after I find out this doesn't work, but I've gotta try it.

PSU NewEgg link here:

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

i5 2500k
90GB SSD
1TB 5400 RPM HDD
16GB 1600MHz RAM (4x4)
(above video cards & PSU)

a c 111 ) Power supply
February 21, 2012 3:55:27 AM

That is a crap power supply. I would not even try using it with the 560ti's because it does not have the correct amperages to even power them.
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a b ) Power supply
February 21, 2012 4:19:00 AM

you have super clocked 560ti's (factory OC'd)
2500k cpu (Great OCing CPU)

don’t dodge them out on a cheap no brand PSU.
there is no guarantee that its 700w true power and not 700w peak
which is like 100watt RMS vs. 100w PMPO for speakers (there is a big difference)

It’s also not 80 Plus Bronze Certified so its a quite inefficient PSU

Look at something like an OCZ or Corsair

e.g. http://www.newegg.com/Product/Product.aspx?Item=N82E16817341052

thermaltake, antec and coolermaster aren’t too bad either.

Worst case scenario is it blows a video card, motherboard or CPU up. (Pretty slim chance tho)
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a b ) Power supply
February 21, 2012 4:24:56 AM

you also need 30a per video card on the 12a Rail. you only have 42a on that psu.
[urlhttp://www.techtobuy.com/techtobuy/evga-01g-p3-1567-kr-...[/url]

so definatly run into issues with power being you have 2 of them.

the linked OCZ above has 62a on its 12v rail. so it would be MINIMUM power to run SLI 560TI Superclock cards.
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February 21, 2012 4:42:36 AM

I am running 2 560ti's in SLI and used to run them off a Corsair HX750 which was ample. However, if you want to overclock your GPUs/CPU, I would definitely grab one around the 850-1000 watt range.

I grabbed a Corsair HX1050 so I would have enough headroom, though some may say it is a bit overkill.
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a c 1198 ) Power supply
February 21, 2012 4:50:04 AM

For a system using two GeForce GTX 560 Ti graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 700 Watt or greater power supply that has a combined +12 Volt continuous current rating of 52 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors.

The XION XON-700P12F, with its combined +12 Volt continuous current rating of 46 Amps and with its two 6-pin PCI Express supplementary power connectors, is insufficient to power a system with two GeForce GTX 560 Ti in 2-way SLI mode.
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a c 144 ) Power supply
February 21, 2012 5:51:45 AM

HugoStiglitz said:
you also need 30a per video card on the 12a Rail. you only have 42a on that psu.
[urlhttp://www.techtobuy.com/techtobuy/evga-01g-p3-1567-kr-...
[/url]
:lol:  :lol:  :lol: 

A pair of superclocked 560 Ti's needs 25 - 28 amps under load. Figure another 10 amps for the CPU. Once you include the rest of a "typical" system, the 700 watt Xion would be marginal at best even if it could produce its full rated output.

Minimum PSU would be a good 650 watt PSU with 50 amps or more on the 12 volt rail. Better would be a good 750.

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February 21, 2012 11:21:27 AM

alright, alright.

I'll honestly have buy another power supply.

It'll be modular and 80plus with a minimum of 700w.

I've seen a lot of guys on here recommend 600w PSUs for a single 6670 so I think I'll be okay with 700.

pic related: http://i81.photobucket.com/albums/j201/cantstandya/Cost...

and I'll also stab myself in the heart before I buy a Corsair. Way over-priced and when you get down to it, it's just a block that feeds the important things power.

it'll be something like this:

http://www.newegg.com/Product/Product.aspx?Item=N82E168... -- lol. had 2 PCIe's again

...but then again I'll probably go for 750 though. keep in mind the calculator said 550 or something under heaviest load
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a c 1198 ) Power supply
February 21, 2012 3:27:48 PM

flossbandit said:
alright, alright.

I'll honestly have buy another power supply.

It'll be modular and 80plus with a minimum of 700w.

I've seen a lot of guys on here recommend 600w PSUs for a single 6670 so I think I'll be okay with 700.

pic related: http://i81.photobucket.com/albums/j201/cantstandya/Cost...

and I'll also stab myself in the heart before I buy a Corsair. Way over-priced and when you get down to it, it's just a block that feeds the important things power.

it'll be something like this:

http://www.newegg.com/Product/Product.aspx?Item=N82E168... -- lol. had 2 PCIe's again

...but then again I'll probably go for 750 though. keep in mind the calculator said 550 or something under heaviest load

In your original post you said "I want to SLI two GTX 560 TIs...".

What does a single 6670 have anything to do with two GTX 560 Ti's in SLI mode?

A Radeon HD 6670 is a 66 Watt card and doesn't even use any PCI-E Supplementary Power Connectors. Any power supply with a combined +12 Volt continuous current rating of 20 Amps would be sufficient for this card. There are 250 Watt power supplies that meet this requirement.

A GeForce GTX 560 Ti is a 170 Watt card that requires the use of two 6-pin PCI-E Supplementary Power Connectors and you're using two of these.

The power requirements are nothing alike.

Total Power Supply Wattage is NOT a crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important.

Anyone that purchases a power supply without taking into account the power supply's combined +12 Volt continuous current rating doesn't know anything about how to properly select a power supply.

Any reputable power supply calculator will give you the the power supply's combined +12 Volt continuous current rating required.

Just get one of these. It's better than the Corsair and substantially better than any Cooler Master crap.

http://us.ncix.com/products/?sku=62224&vpn=P1750BNLG9&m...
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a b ) Power supply
February 21, 2012 3:51:26 PM

When I built my last system i had 2 8800gt in SLI So i got this PSU. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
It was cheap and it worked well for me. Then I upgraded to the 2 GTX 470s and I tried to go cheap and keep the PSU. I knew I was cutting the wattage close and I did not even figure in the amperage. That PSU has a max current of like 40. Any way the computer seemed to work fine with both 470s most times but some times it was unstable during games. Random crashes and video driver stopped responding messages. I thought it was a driver issue and I was going nuts. Finally I got a new PSU and all the problems went away. I got this.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Point of the story is a cheap PSU may seem to work ok but it will just cause head aches in the long run. Better to buy a good one now and not worry about it. No point in plugging $800 worth of computer into $50 worth of PSU.
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a c 140 ) Power supply
February 21, 2012 4:03:24 PM

1. I'd still dump the Xion even if it did have the minimum wattage "on the label".

2. If ya gonna run those cards just as they come "outta the box", then if ya had a 750 watter, I'd try it. If you are going to overclock further, then I'd get an 850 watter.

Top 850 watt PSU's include .....

First Choices (10.0 jonnyguru performance rating):

Antec CP-850
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
$115 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Antec SG-850
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
$250 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Corsair HX850
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
$160 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

XFX Black Edition
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...

Second Choices (9.5 jonnyguru performance rating):

Antec TPQ-850
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
$130 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Antec HCG-900
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
$140 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Corsair TX V2
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
$125 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Corsai AX-850
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
$170 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

XFX Core Edition 850
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
$120 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Seasonic MD12 850
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...


NZXT Hale90
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
$180 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Third Choices (9.0 jonnyguru performance rating)

Antec HCP-850
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...

Enermax Revolution 85+
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...

Others

Toughpower XT 850 (8.5)
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...

OCZ Z Series 850 (8.5)
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...

Silverstone Element ST85EF (6.0)
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
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a c 140 ) Power supply
February 21, 2012 4:11:34 PM

Also, ya may wanna rethink ya card choice..... to my recollection the EVGA you picked uses the same VRM as on the reference 560's. If you plan to further overclock the thing, (they go as high as 1070), I would look for one with a beefed up VRM to handle the increased loads. Gigabyte and Asus for example, have 7 phase designs which make it suitable for handling the speeds shown in the link below:

http://www.pureoverclock.com/review.php?id=1201&page=17

I wouldn't even try and get close to that with a reference VRM.

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February 21, 2012 6:07:08 PM

JackNaylorPE said:
Also, ya may wanna rethink ya card choice..... to my recollection the EVGA you picked uses the same VRM as on the reference 560's. If you plan to further overclock the thing, (they go as high as 1070), I would look for one with a beefed up VRM to handle the increased loads. Gigabyte and Asus for example, have 7 phase designs which make it suitable for handling the speeds shown in the link below:

http://www.pureoverclock.com/review.php?id=1201&page=17

I wouldn't even try and get close to that with a reference VRM.



The system's already built. That's the card I'm using right now. I just want to SLI it with the same make and model. It's good too. No regrets, no complaints.

Overclocking? Whatev... I might do it in the future when it's in its glory years when games really, really surpass what it's capable of, but right now it's totally good to go. Plus I don't like loud fans. I'd just appreciate the power of a second card.

I'm also sure it would disgust plenty of you to know that I've also only OC'ed my 2500k 600Hz using the dummy clock on my EVGA Z68 board. Also I don't seed when I torrent.

As for the XION PSU I've got now... It's probably overkill for the single 560 TI... lots of overkill. Works fine. No complaints with current config... just with my plans. If somebody else wanted it who buy one who was going to use only one GPU, I'd totally recommend it. I'd tell them to put the extra $40 they were going to dump in the Corsair into a more powerful GPU. Meh, it's not 80plus, but I don't pay the electricity bill so it could dim the lights in the other room for all I care.

And yeah, it probably will come down to another PSU but I'd rather be beaten than spend over $100 on one.
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February 21, 2012 6:17:00 PM

ko888 said:
In your original post you said "I want to SLI two GTX 560 TIs...".

What does a single 6670 have anything to do with two GTX 560 Ti's in SLI mode?

A Radeon HD 6670 is a 66 Watt card and doesn't even use any PCI-E Supplementary Power Connectors. Any power supply with a combined +12 Volt continuous current rating of 20 Amps would be sufficient for this card. There are 250 Watt power supplies that meet this requirement.

A GeForce GTX 560 Ti is a 170 Watt card that requires the use of two 6-pin PCI-E Supplementary Power Connectors and you're using two of these.

The power requirements are nothing alike.

Total Power Supply Wattage is NOT a crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important.

Anyone that purchases a power supply without taking into account the power supply's combined +12 Volt continuous current rating doesn't know anything about how to properly select a power supply.

Any reputable power supply calculator will give you the the power supply's combined +12 Volt continuous current rating required.

Just get one of these. It's better than the Corsair and substantially better than any Cooler Master crap.

http://us.ncix.com/products/?sku=62224&vpn=P1750BNLG9&m...


One thread comes to mind I saw a while back when a guy wanted to upgrade his system.

He was going to use an Athlon with a 6670. He said he had a 500w PSU. Some dude told him to get rid of it because he needed at least a 600w.

:pfff:  :pfff:  :pfff:  :pfff:  :pfff:  :pfff:  :pfff:  :pfff:  :pfff:  :pfff: 

Moral of the story is that people will tell you you need a lot more juice than you really do.

True story.
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a c 1198 ) Power supply
February 21, 2012 6:25:00 PM

flossbandit said:
One thread comes to mind I saw a while back when a guy wanted to upgrade his system.

He was going to use an Athlon with a 6670. He said he had a 500w PSU. Some dude told him to get rid of it because he needed at least a 600w.

:pfff:  :pfff:  :pfff:  :pfff:  :pfff:  :pfff:  :pfff:  :pfff:  :pfff:  :pfff: 

Moral of the story is that people will tell you you need a lot more juice than you really do.

True story.

The problem is that people will trust the recommendation of those online PSU calculators.

A lot of those calculators tend to grossly overestimate what is actually required because the website is in the business of selling power supplies and the profit margin is better on higher powered units (i.e. up-selling is more profitable).
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February 21, 2012 6:30:59 PM

probably going to come down to this 850w RaidMax:

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

or this 750w OCZ:

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

If you think I'm making a horrible mistake please try to convince me why.

Can't accept "OMG!!!!11!!1 it's not a CORSAIR!!1!!"

oh, and in case you're wondering where my loathing for corsair comes from it's mainly because I saw this video a while back:

http://www.youtube.com/watch?v=G8BMfSkqUp4
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a c 1198 ) Power supply
February 21, 2012 7:10:36 PM

flossbandit said:
probably going to come down to this 850w RaidMax:

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

or this 750w OCZ:

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

If you think I'm making a horrible mistake please try to convince me why.

Can't accept "OMG!!!!11!!1 it's not a CORSAIR!!1!!"

oh, and in case you're wondering where my loathing for corsair comes from it's mainly because I saw this video a while back:

http://www.youtube.com/watch?v=G8BMfSkqUp4

Your loathing for Corsair comes from a YouTube video put out by Tiger Direct?

Raidmax? You're joking, right?
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February 21, 2012 7:27:25 PM

ko888 said:
Your loathing for Corsair comes from a YouTube video put out by Tiger Direct?

Raidmax? You're joking, right?


dem 61 honkies who rated it 5 eggs wasn't joking.

and dood. i really don't care what the label says. especially on the least important piece of the build.

nike kicks walk the same as faded glories

only these faded glories will be pushed up in a metal case that nobody can see.

and i'm totally leaning towards that raidmax... 100 more watts and gold? i can get down with that.


oh and yes, my loathing for Corsair comes from a YouTube video put out by Tiger Direct. Everything that didn't come out of his mouth totally said it.

i've seen that attitude come out of thick framed glasses before, only they were in a Starbucks, just after stepping out of a Prius, wearing toms, watching a Michael Cerra movie on their Macbook Pro.
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a b ) Power supply
February 21, 2012 7:52:17 PM

flossbandit said:
dem 61 honkies who rated it 5 eggs wasn't joking.

and dood. i really don't care what the label says. especially on the least important piece of the build.

nike kicks walk the same as faded glories

only these faded glories will be pushed up in a metal case that nobody can see.

and i'm totally leaning towards that raidmax... 100 more watts and gold? i can get down with that.


oh and yes, my loathing for Corsair comes from a YouTube video put out by Tiger Direct. Everything that didn't come out of his mouth totally said it.

i've seen that attitude come out of thick framed glasses before, only they were in a Starbucks, just after stepping out of a Prius, wearing toms, watching a Michael Cerra movie on their Macbook Pro.

I love this guy.... dude you should try stand up comedy.
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a b ) Power supply
February 21, 2012 8:18:28 PM

Ok more details surface the longer this thread goes on.

So you currently have 1 560TI. in that case the PSU you have currently have will work. (700w XION)

when u purchase the 2nd 560TI i would get the 750w OCZ i linked near the top and u linked again later on.

START SEEDING DAMN U.......rofl.
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February 21, 2012 9:10:10 PM

flossbandit said:
and dood. i really don't care what the label says. especially on the least important piece of the build.


Yet it becomes the most important part when it dies, which happens more often than you might think.
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a b ) Power supply
February 21, 2012 9:16:25 PM

i would not consider it LEAST important. that would be your ROM.

It won't directly effect performance but in your case it will be the difference between being able to run the video cards you want and not being able to.
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February 21, 2012 9:18:59 PM

HugoStiglitz said:
i would not consider it LEAST important. that would be your ROM.

It won't directly effect performance but in your case it will be the difference between being able to run the video cards you want and not being able to.


no rom & no card slots in my case. just not interested and have an external if worse comes to worst.
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a c 111 ) Power supply
February 21, 2012 11:23:02 PM

Because people will tell you 500w for a 6670 :non: 
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February 22, 2012 12:44:51 AM

bought the OCZ ZT Series 750W. it's modular and 80w bronze.

it's not gonna be christmas when it shows up... but at least i wont blow up the house.

holler at my boy linus from NCIX who pretty much sold it to me

http://www.youtube.com/watch?v=Vfn1EX7b6bg
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February 22, 2012 12:45:29 AM

Best answer selected by FlossBandit.
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a c 111 ) Power supply
February 22, 2012 2:22:26 AM

Good thing you didn't get the raidmax, it would have blown your stuff up!
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February 22, 2012 11:27:03 AM

amuffin said:
Good thing you didn't get the raidmax, it would have blown your stuff up!


I truly think the only reason it came down to the OCZ was 5 year warranty.

Raidmax had higher reviews.. but still... it could have been like:

(Raidmax) "5 eggs... this piece of *** didn't even burn down the neighborhood... and it's a Raidmax too)

VS

(OCZ) "1 egg... it's an OCZ and ALL it did was power the computer. No bells and whistles here folks)
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February 24, 2012 9:18:44 PM

Well boys. The OCZ came in today.

Just so you know it sounds like a f­***ing vacuum cleaner under load (if you can even call MW3 load) As you can see my rage and frustration has pushed me so far I've bypassed the word filter just so you can see my curses.

Oh and modular put like twice the spaghetti in my case and the ropes around the cables made the cable mgmt side of my case nearly impossible to close.
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February 25, 2012 12:51:39 PM

flossbandit said:
Well boys. The OCZ came in today.

Just so you know it sounds like a f­***­ing vacuum cleaner under load (if you can even call MW3 load) As you can see my rage and frustration has pushed me so far I've bypassed the word filter just so you can see my curses.

Oh and modular put like twice the spaghetti in my case and the ropes around the cables made the cable mgmt side of my case nearly impossible to close.


My first PSU was a modular OCZ 600 watt, so I can understand what you mean about the cables. Ever since I have always made sure that any PSU I buy has flat cables such as the ones found in the Corsair HX750. But no matter what the cable is like, I have always found a way to route them as to minimize the impedance on airflow. It just takes patience and a decent case.
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a b ) Power supply
February 25, 2012 7:41:57 PM

I never really understood why people love modular PSU so much. They end up being bigger because of the connectors, and the whole back of the unit is covered with wires instead of just one little gomet with the wires coming out. Many times they are more difficult to wire then a standard PSU.
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February 25, 2012 9:12:34 PM

bucknutty said:
I never really understood why people love modular PSU so much. They end up being bigger because of the connectors, and the whole back of the unit is covered with wires instead of just one little gomet with the wires coming out. Many times they are more difficult to wire then a standard PSU.


This. Modular sucked for me. Especially for my case. My fingers are sore from putting it in and taking it out. The OCZ PSU was a bust. It's gonna get RMAed.

Can somebody help me pick out another one? It's gotta be a relatively small ATX PSU because I'm working in a mATX case.

The XION fits well @ 6" x 5.5" x 3.5"

Here's a pic of it seated in the case for scale:

http://i81.photobucket.com/albums/j201/cantstandya/PSUC...

I wish I would have taken a pic with the OZC in b/c it barely, barely fit. It was 5.9" x 3.4" x 6.9" BUT fully modular so add another inch for the plugs and another inch and a half for the stiff ass wires. The SATA cables from the HDDs were touching the power cables and pushed upwards a little.

I want to go non-modular, some form of 80-plus, at least 750w, and under $100 with rebates.

This one (5.9" x 3.4" x 6.3") really looked good, but it's an octopus and I'm not sure I'll get away with stuffing the excess under the HDDs like I have with the XION:

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

This Cooler Master (5.9" x 5.5" x 3.4") is small and has minimal cables. This might be it, but I still don't know:

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



I've got about 1/2 an inch of cable management space on the other side and keep in mind it's for SLI so there'll be two of those GPUs.
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a b ) Power supply
February 25, 2012 11:17:13 PM

This topic has been closed by Mousemonkey
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