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Yet another "will this power my GTX580?" question

post #1 of 28
Thread Starter 
Greetings,

As the title reads I have a GTX 580 power issue. Before anyone yells "search god damn" I have done that, and read every single thread I found but none quite answered what I was looking for.

Now, to the issue at hand:

I have an (Xion) AXP PowerReal 850W PSU (link)

And I am planning on buying the ASUS GTX 580. Now, I read that you need 44 amps and 700W and so on, and I feel completely lost.
My PSU states ~18A @ 12V which is clearly not enough. But - does all the 12V rails add up together? Or how does this work? And most importantly, will this PSU power a SINGLE GTX580? Or shall I go ahead and purchase a new PSU first? And in that case, which one (sane price)?
I am mostly interested in "you must upgrade", not "an upgrade is always nice".

Thanks in advance.
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post #2 of 28
It will work fine for a single 580. With the split rails you have a combined 78A on the 12v. That PSU definitely isn't great or anything and I wouldn't chance SLI 580s, but for a single one you're good.
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post #3 of 28
I wouldn't buy it unless you aren't into the modular PSU thing or have a case that has wicked cable management abilities.

Personally though, I think it could handle SLI 80s without much problem. However, the lack of efficiency is a problem. I mean, 78% efficiency for an 850w PSU is sub par for that level. I would rather go for an 80 PLUS Silver PSU for double the price as it's bound to last twice as long and handle it's rated power output without a problem.
     
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post #4 of 28
Usually the PCI-E cables each have their own rail. So plug 1 PCI-E cable with 18 Amps into 1 connection on the GPU, and another one on a separate rail into another and you will have 36A for just the GPU alone which is enough. The 44A and 700W requirement is just for the whole system.
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post #5 of 28
From the fan shot picture on newegg, it looks suspiciously like the same platform as the Xion PowerReal 700W reviewed a while back on jonnyguru:
http://www.jonnyguru.com/modules.php...Story&reid=109

That was kind of a mediocre-at-best older Super Flower unit: nothing anybody would recommend but probably not any immediate cause for concern. Assuming the 850W can deliver at least as much power and at the level of the 700W, you should be okay. Don't think about SLI GTX 580 on this unit, even though a good 850W unit would run SLI GTX 580 handily.

Non-overclocked, a GTX 580 will limit itself under 300W draw. You're probably looking at under 500W total system draw max from the power supply, unless you've got lots of other stuff to power like an overclocked Bloomfield i7 or Phenom II X4/X6 and several hard drives. That's why you're likely okay on this PSU. Just don't push things.
http://www.xbitlabs.com/articles/gra...0_5.html#sect0
post #6 of 28
Quote:
Originally Posted by Dopamin3 View Post
It will work fine for a single 580. With the split rails you have a combined 78A on the 12v. That PSU definitely isn't great or anything and I wouldn't chance SLI 580s, but for a single one you're good.
He most certainly does NOT have 78A on 12V. That's 936 Watts, not only is that more than he has on the 12V, that's more than even the power supply is labelled for total watts.

A quick look at the label says he has 60A on the 12V lines, or 720Watts.

Anyway, as stated above, the platform at least APPEARS to be the same as the powerreal 700W on quick glance, which although not awful is rated poorly. Non-PFC, group design, poor regulation, poor efficiency.

It's not one of the "OMG your computer is going to DIE" units (I think), but it's one of those where I feel if you're going to drop $400 - $500 on a GPU, it would behoove you to also drop $100 on a quality PSU for it.

If you don't plan on SLI, you can happily game away on a 500W like the Antec NeoEco 520C which is only 60 bucks, A rosewill green 530 if you're feel particularly cheap at 50 bucks, or you can go for sweet a little more spacious and nicer like the corsair tx650 v2 for $80.

If you really want to have 850Watts on the label, like you plan to SLI in the future or something you can look into like an hx850 for $150, or lots of other options.
Edited by ocpokey - 5/26/11 at 5:42pm
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post #7 of 28
If it was the supernova series yes but the power real series dunno. Wonder why they havent bother to certify them or sent them out for reviews

That unit of yours can deliver 720/12 so its 60A according to the spec. But we can't really say what it really can deliver without it being tested. But hook it up and see if it give you problems. If it does then you'll have your answer. If not great
post #8 of 28
I agree w/the others ... for single card, that PSU is more than adequate in terms of power. However, it's relatively inefficient in terms of converting AC to DC power ... compared to a Gold-certified unit, you'll probably spend an extra dollar a month on electricity if your PC is on an average amount of time. If you run it 24/7 like a server ... I'd think about replacing it w/something more efficient.

Now, if you wanted to run two 580's on it ... it'd be a little more iffy. Probably 'work', but you wouldn't want to OC your gear.

To answer your question about the 12V rail(s), no, you can't just add them all up. Usually the label on a PSU's will list somewhere what the combined total amperage is that you can pull off the +12V rail.
    
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post #9 of 28
Thread Starter 
Quote:
Originally Posted by mikeaj View Post
unless you've got lots of other stuff to power like an overclocked Bloomfield i7 or Phenom II X4/X6 and several hard drives.
That's ironic... As I have 3 HDDs (if that's "much" I don't know, but it does apply to "several") and an i7 920 @ 3,80 GHz. So... I have both. No insane OC, but still.

Also, I have NO plans what so ever to ever purchase a second card.

But I'll add to my shoppinglist a new PSU in the near future.
Thanks y'all!

Also, should I get a Corsair or Antec? Any specific recommendations just for me before I go checking other recommendations? (also: what's the different between Corsair AX, HX and TX etc?)

-- taintedmind
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post #10 of 28
Brands are not as important as specific PSUs. Corsair and Antec both typically put out really good stuff, but there is still variance. Like I wouldn't recommend a corsair GS psu (not terrible but not really good) for example.

Corsair AX/HX/TX are their Gold/Silver/Bronze line respectively. The quality difference between hx and ax is not always as big as it seems however, as both are usually excellent units for enthusiasts.

If you have a single card only I gave you a few cheapie recommendations, depends what you'd like though. If you want fully modular the Antec TruePower new is a great PSU that's moderately priced. Or the XFX CAH9 is semi-modular and cheap as all get out. The Seasonic x650 is amazing, gold rated fully modular high quality but a bit more expensive. It should power anything you throw at it (unless you SLI 580s) pretty much forever though.

If you don't care about modular the TX v2 series is good. If you want nice high efficiency you can look at Aurum FSP Gold series, good units for reasonable prices, I think the FSP 600 is like $115.
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