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Power Supply and SLI

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November 20, 2010 9:33:45 PM

If I plan on buying another GTX 470, would both of these be able to support it? Also is it not better that the CM PSU has only 1 12V rail?
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a b U Graphics card
a b ) Power supply
November 21, 2010 1:33:27 AM
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The CM psu is not better - the single rail isn't relevant.

Based on the ~180W increase in power draw between 1x470 (364W) and 2x470 (541W) shown here:

http://www.hardwarecanucks.com/forum/hardware-canucks-r...

you would need 900W to run 4x470s. So power-wise you should be fine running 3x470 plus the other card. The heat will be a separate question, however.

Better have a case that can keep things cool, like:

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

or

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
November 21, 2010 2:24:10 AM

As far as heating, both cards run at 37c idle and 84c load. My case is the Cooler Master HAF 932 with 4 120mm fans on the side, 3 120mm top, 2 120mm bottom, 140mm back and 230mm front.
Besides that, are you also preferring of the Corsair HX1000?
a b U Graphics card
a b ) Power supply
November 21, 2010 1:07:38 PM

Yes I prefer Corsair. First, the specific Corsair psu has a better review than the CM.

Second, unlike CoolerMaster, I've never seen any Corsair psu get a bad review. Some aren't perfect, but all are high quality. So I'm not worried that they would change the guts of the psu to save money two years after it was introduced.

The HAF932 is a very, very good case. OTOH, 3x470 and a 9800GTX is a helluva heat load. And no matter how you arrange those cards there will not be an open slot in between them. I wouldn't be surprised if a couple of vid cards ran very hot in a standard case due to trapped air.
November 22, 2010 5:06:03 AM

This is throwing something random out there but is there any danger from placing your PC on top of an air conditioning vent? I know its winter and the heating would probably be on instead but just wondering. Also, my HAF 932 has 2 120mm intake fans on the bottom, so the AC would be sucked right into the case, I'm sure this would drastically drop temps but at what cost?
a b U Graphics card
a b ) Power supply
November 22, 2010 5:34:42 AM

I don't think you'll have any problem with condensation, unless you are routinely shutting down the AC, letting the house go "humid", and then cranking the AC up again.

(The Raven has 3x180mm bottom mounted fans :)  )
November 22, 2010 1:18:19 PM

Yeah Silverstone makes some great cases. I was planning on moving to them for my next build. As far as the AC goes though, isn't there a chance of condensation when the AC is set to auto, cycling on and off every little while. Although the components may stay cool, once the AC turns off and the humidity from the summer air gets in there, it would be disastrous.
a b U Graphics card
a b ) Power supply
November 22, 2010 3:04:21 PM

Yup, that's a risk - depends on how much moisture there is in the air.

So if you want to test it, put a toaster on the AC vent, and make toast.

See if it comes out soggy :) 
November 22, 2010 6:59:35 PM

Good idea! I wasn't planning on doing it though, just curious. What I ended up doing before when I was running a stock cooler on my i7 930, I would put it by the window during the colder days and it'd stay around 28c. During the summer I'd just vent air out of the room during the day and in during the night with a box fan. Now with the Corsair H70 I don't really need to worry about it but the cards will definitely create enough heat on their own.
a b U Graphics card
a b ) Power supply
November 22, 2010 7:40:07 PM

AG Renagade said:
Now with the Corsair H70 I don't really need to worry about it but the cards will definitely create enough heat on their own.
Er . . . uh . . . Yup!

It will be especially cruel to your HAF932's innards if you installed the H70 in the recommended direction, ie, pulling outside cool air through the radiator and "venting" warmer air into the case ;) 

November 22, 2010 7:54:11 PM

I vent it out. lol
a c 235 U Graphics card
a c 164 ) Power supply
November 22, 2010 8:00:52 PM

get the corsair, its a better product then the coolermaster you linked or the thermaltake suggested above

the entire HX series has been getting fantastic reviews by jonnyguru and hardware secrets
Anonymous
a b U Graphics card
a b ) Power supply
November 22, 2010 9:47:55 PM

This Thermaltake is not XT series and i can't guarantee it will do it for you the entire XT series I’m sure about I moved to the XT series because they made modifications is hard to describe. This link it will help how the XT series works:

http://www.tomshardware.co.uk/forum/forum2.php?config=t...

and i gave you the best bronze 80 the think is it operates as silver the ATI link i gave above confirms it can CF 6870 without a problem see it again:

http://support.amd.com/us/certified/power-supplies/Page...

For the Corsair ATI is giving lower energy cards in CF see it here:

http://support.amd.com/us/certified/power-supplies/Page...

The diffrence is huge and you said a lot of cards in the first posts.
November 22, 2010 9:57:07 PM

GTX 470's have more power consumption and require more amperage than 6870's
a c 235 U Graphics card
a c 164 ) Power supply
November 22, 2010 10:26:36 PM

Quote:
This Thermaltake is not XT series and i can't guarantee it will do it for you the entire XT series I’m sure about I moved to the XT series because they made modifications is hard to describe. This link it will help how the XT series works:

http://www.tomshardware.co.uk/forum/forum2.php?config=t...

and i gave you the best bronze 80 the think is it operates as silver the ATI link i gave above confirms it can CF 6870 without a problem see it again:

http://support.amd.com/us/certified/power-supplies/Page...

For the Corsair ATI is giving lower energy cards in CF see it here:

http://support.amd.com/us/certified/power-supplies/Page...

The diffrence is huge and you said a lot of cards in the first posts.


the fist link has been updated, the second link has not. the only common card is the 4870x2 and both state that as "1", please post this "huge difference"
a c 235 U Graphics card
a c 164 ) Power supply
November 22, 2010 10:32:09 PM

AG Renagade said:
Yeah I'm heavily leaning towards the Corsair now. Also, I had already started looking at the Thermaltake ones. This one to be exact: http://www.newegg.ca/Product/Product.aspx?Item=N82E1681...


jonny guru and hardware secrets are two of the top PSU (most would say the two top) review sites on the web. delluser (who knows his PSU as well as anyone on the forum) linked the guru review. see what HS had to say about the HX1000

We were impressed to see that Corsair HX1000W is internally practically identical to Thermaltake Toughpower 1,500 W, a unit labeled with a maximum power capacity 50% above Corsair’s model!
clear pixel

There are three major differences between Corsair HX1000W and Thermaltake Toughpower 1,500 W, though. First, the modular cabling system has a different configuration. On Corsair HX1000W there are six connectors for peripheral and SATA cables, while on Toughpower 1,500 W there are only four. On the other hand, on HX1000W there are four connectors for auxiliary video card power cables, while on Toughpower 1,500 W there are six.

The second major difference is on the use of two virtual rails on each +12 V rail on Toughpower 1,500 W, feature not present on HX1000W. This means that each power supply inside HX1000W uses a single-rail design, while each power supply inside Toughpower 1,500 W uses two virtual rails, for a total of four +12 V rails. The difference between a single rail design and a multiple rail one is how the over current protection (OCP) is connected. On single rail design there is only one OCP circuit that monitors all the +12 V outputs at the same time, while on multiple rail design the power supply has several OCP circuits, each one monitoring a group of +12 V wires (the virtual rails).

And the third difference, and here Corsair HX1000W has an advantage, is that all capacitors on the secondary are solid. On Toughpower 1,500 W only the capacitors used on the +5 V and +3.3 V rails are solid.

We are pretty confident that Corsair HX1000W is in fact a 1,500 W power supply that Corsair decided to label as a 1,000 W model because of efficiency. If Corsair had labeled this unit as a 1,100 W or greater unit it wouldn’t achieve the minimum 80% efficiency at full load that is considered by today’s standards the minimum a power supply should perform....
In summary Corsair HX1000W is a practically flawless 1,000 W power supply clearly targeted to users with three or four very high-end video cards and several hard disk drives. Of course if you are building a more modest system with only one or two video cards, you should buy a more inexpensive product, which will give you a better cost/benefit ratio.


http://www.hardwaresecrets.com/article/Corsair-HX1000W-...
November 22, 2010 10:40:30 PM

On Nvidia's official SLI site they have the certified PSU's that they themselves have tested. http://www.slizone.com/object/slizone_build_psu.html

If you look under 3 GTX 470, the HX1000 is certified and I'm most likely going to get that now. Since I'm going to be running 2 470's plus a 9800GTX+, and this PSU is certified for 3 470's, I shouldn't have a problem. Anyone else see any issues with buying this PSU? I have now read a fair amount of good reviews on this power supply and its at the top of my list.
a b U Graphics card
a b ) Power supply
November 23, 2010 1:35:36 AM

Case closed lol.
November 23, 2010 5:00:40 AM

lol. Anyone else have any other thoughts?
November 26, 2010 3:23:32 AM

Best answer selected by AG Renagade.
November 26, 2010 3:24:02 AM

Thanks for the help everyone. I ended up choosing the Corsair HX1000.
a c 169 U Graphics card
a b ) Power supply
November 26, 2010 6:11:07 AM

This topic has been closed by Maziar
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