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Rails: Single vs Multiple - Page 2

post #11 of 28
Online power calculators always overdo it. You don't need 1k for those parts.

These days, multi-rail and single rail are no different as long as it's a quality unit.
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post #12 of 28
Get a 1KW HCP and be happy. The HCP-1200W is the king of PSUs and eats the AX1200 for dinner and can pump about 1700W from the wall with no problems which is like having a 1550W PSU. Ask Phaedrus (our own PSU guru) and he'll tell you the same thing. 1,2KW is non sense though. 850W would be enough, 1000W for overkill and 1200W for overkill AND 3 GTX 580s. Just get a HCP-1000W, it will be more than perfect. Good luck
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post #13 of 28
I wouldn't say the HCP-1200 eats the AX1200 for dinner. The HCP just barely edges it out in performance in some reviews, and ties with it in others. And it has the added safety feature of competently done OCP, rather than Corsair's method of saying "frack it!" and leaving out OCP entirely. The first batch of AX1200s also had some issues, but that's been pretty much resolved I believe. The Corsair does have a better cabling system than the HCP.
post #14 of 28
Quote:
Originally Posted by Sagenth View Post
I am doing a rolling upgrade.

PSU + GFX
http://www.newegg.ca/Product/Product...82E16814130655
>
Water Cooling Unit (koolance)
>
MoBo+Case+CPU (i7 or AMD's new chip coming out, if it comes out in time)
>
GFX(SLI) with water cooling block preinstalled.
http://www.newegg.ca/Product/Product...82E16814130601

Once I have the card directly above I will put it in the primary pcie x16 slot and use the air cooled as the secondary

Oh in the mean while I have an
Athlon 64 X2 6000+
2x1GB DDR2 800
Geforce 9600 GSO 512
500 Watts
1 Optical Drive
3 Hard disk drives @ 7200RPM
1 4pin Aux power (http://www.newegg.ca/Product/Product...82E16813138081)
If anyone in this thread would know, then it's Shub (edit: and now Phaedrus2129). He's one of our PSU experts. All that you need is a quality 850W power supply (which would be more than enough).


Quote:
Originally Posted by Sagenth View Post
I need it compatible with future upgrades.
I am going to have 5 HDDs which i guess I should have included in that upgrade scenario.

I am thinking one or two 10,000RPM drives

In any case the important part is that it needs both forward and backwards compatibility. According to my research it has a TDP of 250Watts so times 2 makes it 500Watts for the GPUs alone.
Yeah, but it doesn't work that way due to the scaling of SLI (and even Crossfire). I mean, it's not possible for both cards to be consuming 250W each at the same time - unless maybe for folding.

Quote:
Originally Posted by Sagenth View Post
+200Watts or so for the CPU 700 That is exaggerated cause with water cooling I want to see how high i can OC it. The same goes for the graphics cards so lets say 550 for the gfx and put it at 750Watts total so far
According to my Kill A Watt readings, my CPU never consumes much more than about 100W under full load while running Prime95. I mean, when I run Prime95, I never see much more than about 100W get added to my idle readings from my Kill A Watt.


Quote:
Originally Posted by Sagenth View Post
Then with peripherals I figure 200Watts to to be safe, never know what you might want to add in later.
200W?! For what?


Quote:
Originally Posted by Sagenth View Post
Newegg suggests 1200Watts and extreme power says 900
But these calculators are very inaccurate - especially when they're not used correctly. It's very, very, very easy to use them incorrectly.

Please trust the PSU experts on here: for your system as you have planned it for both now and in the future with two GTX 580s in SLI, you will not need anything more than a quality 850W power supply (which is more than enough). If you go with a quality 850W unit, then it will mean that you will spend less money which means you can buy other cool things for the computer.


Quote:
Originally Posted by Sagenth View Post
I figure 1100 or 1000 watts.. or higher would be fine. If I go higher I won't need to worry about upgrading it unless power requirements rocket far higher or different connectors are needed and aren't compatible with the modular sockets.
=================
Important question part
=================
I am more concerned about the recommended psu req for the 580s which says x wattage @ 48Amperes.. Now that doesn't mean IT needs 48 amperes right? that is a figure which assumes a single rail.. No?

I will worry about the wattage and all that in the end, not too concerned about it. It is this whole rail / amperes.. this power dispersion stuff I need help with.
Those PSU requirements are talking about peak-rated power supplies. NVIDIA (and also AMD) want to make absolutely certain that they don't have customers complaining that their generic PSU doesn't have enough power.

Also, it's not just referring to single-rail PSUs. If they did that, then they'd have customers complaining because their multi-rail PSU doesn't have enough power or something...

Instead, it's saying that they recommend a PSU that has a +12V capacity of 48A (which is 576W). NVIDIA's website recommends a 600W power supply, but they don't mention the Amperage. However, they're still talking about 600W peak-rated power supplies.

Generally, when you want to consider two cards, it's best to add about 100-200W to the recommended value for 1 card (sometimes 150W). So that brings us to about an 800W peak-rated PSU. Now, most 800W peak-rated units can really only continuously deliver about 675-700W while any quality 850W unit we recommend will be able to continuously deliver 850W.

So yeah, if you bought a high quality 850W power supply, then you would have all the power that you would ever need.
Edited by TwoCables - 8/11/11 at 8:53am
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post #15 of 28
Thread Starter 
Thanks for all the support. I've been tearing away at the web finding as much information about power supplies.. It is really difficult when all you have to go by is the TDP of SOME components. The last computer I built was in 2007 and I'm still running it today obviously, it only has a 500Watt supply. Rails and all this junk weren't a big concern since it was such a low to mid end machine. Only cost under 1000$ too.

This beast I am devising now is going to run something over 2 grand, maybe three. Unless something better than the i7 comes out from AMD. Which hopefully will happen before or by november, I want to have this all ready for TESV and D3.

Alright so I will revise my parameters and look for 850-1100. I am going to be angry with you guys if it ends up that my power reqs aren't met. You all live on this psu board though, from what I can tell. So I will trust you all blindly Unshaking faith.
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post #16 of 28
Quote:
Originally Posted by Sagenth View Post
Thanks for all the support. I've been tearing away at the web finding as much information about power supplies.. It is really difficult when all you have to go by is the TDP of SOME components. The last computer I built was in 2007 and I'm still running it today obviously, it only has a 500Watt supply. Rails and all this junk weren't a big concern since it was such a low to mid end machine. Only cost under 1000$ too.

This beast I am devising now is going to run something over 2 grand, maybe three. Unless something better than the i7 comes out from AMD. Which hopefully will happen before or by november, I want to have this all ready for TESV and D3.

Alright so I will revise my parameters and look for 850-1100. I am going to be angry with you guys if it ends up that my power reqs aren't met. You all live on this psu board though, from what I can tell. So I will trust you all blindly Unshaking faith.
If you still have doubts, then I recommend either making a new thread to see if a "quality 850W power supply" is enough for what you want to have in your system (so be sure to list everything that draws its power from the PSU), or send Phaedrus2129 a private message. However, Phaedrus2129 gets tons and tons of private messages every day, so it would be easier to just make a new thread. I mean, this thread is about Single-rail units vs. Multi-rail units, not how much your system would need.

What CPU are you looking at right now? I know you said, "i7", but which i7?
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post #17 of 28
Thread Starter 
Quote:
Originally Posted by TwoCables View Post
What CPU are you looking at right now? I know you said, "i7", but which i7?
Gulftown
http://www.newegg.ca/Product/Product...82E16819115079

"I mean, this thread is about Single-rail units vs. Multi-rail units, not how much your system would need."
How much should I worry about Single rail vs Multi rail
Taking those two PSUs as the starting point. Let's assume I blow 4000$ on all the hardware. How much consideration should I put into the safety debate. Also with the 7 year warranty.. the corsair has, I would assume that covers damages no?
Edited by Sagenth - 8/11/11 at 12:50pm
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post #18 of 28
Wow. I wish I had that kind of money. $1,000 for JUST THE CPU? Holy crap. What are you going to be doing with your computer?

Anyway, I recommend studying this to learn more:

PSU "Single/Multiple Rail" Myth
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It's a computer!
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post #19 of 28
Quote:
Originally Posted by Sagenth View Post
Also with the 7 year warranty.. the corsair has, I would assume that covers damages no?
That would be something to research before buying
Personally though, I wouldn't mess with single rail units past 70-75A@12V.
post #20 of 28
Just in case: 70A is 840W, and 75A is 900W.
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250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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