Choice between 2 PSUs. Can't find significant info on either.

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bombchu

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Alright, I recently bought this power supply from a Newegg Marketplace seller.

http://www.newegg.com/Product/Product.aspx?Item=9SIA2J53KK9010

I didn't realize I hadn't purchased from Newegg until I looked at the order afterward.

Anyway, the item I received was this:

http://www.newegg.com/Product/Product.aspx?Item=1HU-001A-00002&cm_re=EP-700PM-_-1HU-001A-00002-_-Product

I requested a return, but judging from the store's reviews it could be weeks before I get what I paid for. My question is, would I be alright hanging on to the one that was sent? I can't find a single review for either PSU, and I don't know enough to judge quality from the available info. I realize that it's probably suggested that I find a more expensive PSU, but that isn't an option at the moment. It's either use the Topower, or wait what could be weeks for the Athenatech. Can anyone offer any advice, or at least a general idea of the quality difference between the two, not counting the modular aspect?

Thanks a lot :)
 
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turkey3_scratch
There is zero information on either of those PSUs, so the decision is up to you. I wouldn't use them.

The 270X is a 135W GPU under heavy load. So a quality 550W unit would probably be recommended minimum, but preferably a quality 650W unit.

The Seasonic S12ii 520W probably could work, I don't know, but that's not one of your choices so I'll quit talking about it. :p
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aparnell572

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If you search out johnny guru reviews, the guys a master of reviews on psu and there is a ton of information on his website. A psu is not something you want to go cheap on because it risks damaging the rest of the equipment attached to it, good luck
 
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jimmyEatWord

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a PSu is not a complicated thing to make , they make them even in my country , so i wouldn't necessarily buy the tier 1 and 2 nonsense , i ordered an antec psu in canada and it burned on the second or third occasion (and it wasn't even my fault!) , so basically there goes your tier 1 and 2
 
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jimmyEatWord

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Well , maybe i'm wrong but Athenatech must be a greek company , i would rather buy a greek psu than something like Antec or worse Corsair that is simply too expensive for no reason ; the psu is a simple electrical component , they make them all around the world probably in india too by now ^^
 
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aparnell572

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Why can't you find a power supply besides those two that fit your needs? 700w doesn't mean 700w if its efficiency rating is 60 - 70%. Theres no way to tell either since it doesn't state the efficiency rating
 
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jimmyEatWord

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well , i can tell you with certainty that Antec is crap and Corsair is too expensive so look for something other than those two
 
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bombchu

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I'm sure you guys want to hear the specifics of my situation even less than I want to go into them. The money is spent. I can either keep the incorrect one that was sent to me or battle it out with this company for the correct one. Or pay a 15% restocking fee to return it for a refund and have no PSU and even less money to spend on one. I'm aware that my original choice was abysmal, but it is what it is. I have to make one of those two work, or go without.
 
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jimmyEatWord

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That doesn't matter much , all you need to look for is the DC power they output , and if it matches the power consumption of your components , the companies do have a calculator on their website for that , even here in iran
 
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bombchu

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So, the vibe I'm getting is that nobody really knows which one is slightly less awful than the other, because they are both so bad that nobody who knows what they're doing would touch either one of them. Is that about it?
 
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turkey3_scratch

turkey3_scratch

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There's a lot more to look at than that. Voltage regulation, ripple and noise, transient response, protection circuitry working, wire gauge, turn-on transients, EMI filtering, surge suppression, capacitor selection, soldering, crossloading, rail distribution, AC_loss to PWR_OK time, hold-up time, fan quality, ratings of silicon. All that is important stuff that cannot be overlooked.
 
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bombchu

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I realize. Someone said something earlier about not knowing the efficiency percentage of either. I was just filling in a blank.
 
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bombchu

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Hmmm... ok, let's rephrase the question. Does anyone happen to know enough about either one of these to say with any confidence which one is the least awful? If not, I'll just pick the guy who said I should choose the one that had the most pictures.
 
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bombchu

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Sure. I would have in my original post, but I didn't think it would make much difference.

Mobo: Asus M5A99X Evo R2.0
CPU: AMD FX-6300 Six-Core
GPUs: R9 270x Hawk 2gb x2
HDD: Couple of 7200rpm TB drives, honestly not sure the brands off the top of my head.
Memory: 8gb DDR5, again don't remember brand.

Not sure what else you need.
 
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bombchu

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Lol, I only have those 2 to choose from. Are you telling me that a 520W would power 2 270x Hawk GPUs? I just gave my 550 to my mom after getting the second GPU because I figured there's no way. That's how this disaster began in the first place.
 
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turkey3_scratch

turkey3_scratch

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The PSU you purchased is most likely a 400W power supply.

A power supply is not a squirt gun. It does not store "power". It cannot run out of power. No power supply can run out of power! You must stop imagining a power supply as a tank of power that can run out. That is not what a power supply does. A power supply uses the voltage and current from your wall socket to create a different voltage and current for the components. Current in this case is electrons, how many pass a cross-sectional area of a wire per second. If the wire is thicker and the speed of the electrons remains, current is greater. If the wire remains and the speed of the electrons increases, current is greater. It's just a bunch of subatomic particles moving in basically a circle.

Any power supply, even a 50W turd, has the ability to create a great enough current to merit 10000W. Current * voltage = wattage (power). There are three problems though with some units:

1) Voltage outputs become unstable when large amount of current/power are required, and unstable voltage can damage hardware or cause system instabilities.
2) The power supply internals actually burn because those electrons are moving so much faster and faster that this friction as heat actually causes wires to burn, or your power supply goes boom. Capacitors can erupt.
3) Built in protection circuitry detects if the above is going to happen and shuts down the unit to save itself.

You'll find that many "700W" units will blow up after creating enough current to merit 400W. Note that I say create current. Current can be created, current can be delivered, but power is energy, and the result of a mathematical calculation. Power is not a substance, and a PSU's primary task is to create current and maintain a stable voltage on its wires.

With 2 270X GPUs, let's see. Yeah, it should work on the Seasonic, but in that case I'd get the 620W S12ii. Or get something like a Corsair 650 RMx, if you want to pay for a premium PSU.
 
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