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Corsair AX850 for SLI GTX 580

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November 3, 2011 2:46:25 PM

Hey guys, just finishing off my part list and im trying to save a little money here and there. Right now i have a Corsair HX 1050W PSU in my part list, but it is running the overall price of the system up a little bit. Im not sure how soon I will be going SLI, so I dont want to spend this extra money for something that might not be all that necessary.
My other option would be to go for an AX850, and save a little money. Will that be sufficient power for SLI 580's though? I dont really want to be stuck having to get another PSU when i get another card, especially after paying $180 for this one.

Any help would be much appreciated.

rest of system:

CPU: i5 2500K
GPU: MSI GTX 580 Lightning
MOBO: AsROCK EXTREME4 GEN3
RAM: (2x4GB) Corsair Vengeance
Cooling: Corsair H100 eventually
November 3, 2011 3:00:31 PM

hmm, I was a bit more keen to go modular or semi-modular.
With the non-modular one, how easy would it be to tuck all the bulk of the wires away in the backspace of the case, and just run NZXT cable extensions up through the case. I was planning to get some white cable extensions to make the build look awesome and clean.
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November 3, 2011 3:06:22 PM

jckstein said:
hmm, I was a bit more keen to go modular or semi-modular.
With the non-modular one, how easy would it be to tuck all the bulk of the wires away in the backspace of the case, and just run NZXT cable extensions up through the case. I was planning to get some white cable extensions to make the build look awesome and clean.


If having a neat looking PC is important to you then you need a modular PSU. Unless you have some sort of cover in your case that extends over the back of your PSU (HAF X), you will have a big ball of cables sitting there. The AX850 is barely enough for SLI 580. You will have little room for overclocking or anything else that consumes power. I would recommend getting the HX1050 if you want a lot of headroom to overclock as much as you like without worrying.
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November 3, 2011 3:10:57 PM

Would it be smarter to buy a cheaper, smaller PSU that is good for running this setup with just one 580, and then when the time comes, get a new PSU with the new card. That way i dont pay for a PSU now that might run SLI, but rather one that i know i only intend to use for a single card.

Im going for a Corsair 650D case also, so i do believe i will have the case cover you are talking about, that i can run extensions up through.
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November 3, 2011 3:25:49 PM

No, you don't need 1050. It's too overkill. A good 850w can easily handle it but I recommended the 950w because it was cheaper than most of the 850w.

Go for the non-modular one. It will still be neat looking.
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November 3, 2011 3:30:41 PM

hmm, its a tough decision when i have two contradicting ideas coming from you both.
I really need some clarification for a third party member.
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November 4, 2011 12:03:33 AM

Why does that make it look like the 850W will be fine, yet so many people are adamant that it will be too close to its limit.
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November 4, 2011 12:06:21 AM

850w is fine. I just linked you the 950w because it's cheaper and has more watts so that when the time comes you will never need to change PSUs
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November 4, 2011 12:20:41 AM

I just dont want to end up having to buy a new PSU if i get a second 580.. but im still not sure how soon that will be. If its not going to be for a while, im worried that it would also be a waste playing with a 1050W PSU which has an unnecessarily large overhead.

Ahhh the struggles.
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November 4, 2011 12:29:53 AM

I would go for 950w to be safe, especially if you plan on overclocking a bit.
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November 4, 2011 12:30:10 AM

850w is fine seriously. 1050w is a waste of money.

Just get the 950w I listed and be happy. It's cheaper and is one of the best manufacturers of PSUs ever.
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November 4, 2011 12:35:21 AM

Why a 950W PSU ? the AX 850W will do the job just fine, 2 GTX 580s in SLI with a system equipped with i7 965 OCed to 3.7 consumes 719W in full load.
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November 4, 2011 12:35:25 AM

Ok.
One more thing though.
THe other alternative i was considering was to stick with my current 650W PSU. THe only problem is, is the fact that it is rather outdated and doesn't have the right PCI-E connections to go with a new card such as the 580. Is there a conversion cable that will allow me to use this older PSU with the new cards and if so, will 650W be ok to run a single 580 setup until i decide what i want to do after?
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November 4, 2011 12:36:37 AM

That really depends on your PSU make, link your PSU. And yes there's a molex to 6 pin/8 pin adapter.
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November 4, 2011 12:36:46 AM

ilysaml said:
Why a 950W PSU ? the AX 850W will do the job just fine, 2 GTX 580s in SLI with a system equipped with i7 965 OCed to 3.7 consumes 719W in full load.


The 950w is cheaper. :bounce: 
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November 4, 2011 12:38:25 AM

Cheaper doesn't mean better, and PC power and cooling is a great PSU but it's non modular that's why it's cheaper.
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November 4, 2011 12:44:21 AM

I wouldnt even be able to find the PSU again.. its from 08

I can go take some specs from it though.. Anything in particular?
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November 4, 2011 12:44:29 AM

ilysaml said:
Cheaper doesn't mean better, and PC power and cooling is a great PSU but it's non modular that's why it's cheaper.


It's just cable management. :bounce: 
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November 4, 2011 12:46:47 AM

cutebeans said:
It's just cable management. :bounce: 



True dat!
regardles of the PSU im getting, i will definitely pick up some NZXT cable extensions to make the system really clean (and the black/white color setup will look great!)
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November 4, 2011 12:47:26 AM

719w in a 850w is an 84% load, imo that is too much. You want to be at around 70%. When it comes to PSUs, the only thing you lose getting more power than you need is a few bucks. If you get less, then there's a chance something might go wrong, albeit small but still. I don't know about you but if I invest over a grand into a new PC, the last thing I want to worry about every time I max my computer out is if the PSU will hold.
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November 4, 2011 12:50:21 AM

jckstein said:
I wouldnt even be able to find the PSU again.. its from 08

I can go take some specs from it though.. Anything in particular?

Seasonic.
NZXT.
Corsair.
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November 4, 2011 12:50:39 AM

gmcizzle said:
719w in a 850w is an 84% load, imo that is too much. You want to be at around 70%. When it comes to PSUs, the only thing you lose getting more power than you need is a few bucks. If you get less, then there's a chance something might go wrong, albeit small but still. I don't know about you but if I invest over a grand into a new PC, the last thing I want to worry about every time I max my computer out is if the PSU will hold.


Sounds logical. Thats why im leaning towards sticking with my old PSU, which should hopefully be fine with a single 580 and the rest of the system.

I just looked, its an Antec 650W 12V PSU. Would it work?
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November 4, 2011 12:51:56 AM

So to end this argument, a 850W high quality PSU will handle your system, whether you get higher wattage one despite being modular or non-modular, it's up to you.
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November 4, 2011 12:54:00 AM

To end this argument, buy the 950w. lol.
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November 4, 2011 1:01:07 AM

jckstein said:
Sounds logical. Thats why im leaning towards sticking with my old PSU, which should hopefully be fine with a single 580 and the rest of the system.

I just looked, its an Antec 650W 12V PSU. Would it work?


Same argument applies. The 650w will probably handle a single stock GTX 580, but it won't be ideal, especially if you plan on any overclocking. A 750w will comfortably power any gtx 580 system.

My recommendation: get a 950w or greater now and stop worrying about it ever again.
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November 4, 2011 1:03:45 AM

ahh.. your right..
im just gonna go HX1050 and be safe.

Thanks and sorry guys.
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November 4, 2011 1:04:51 AM

Good choice, that's a great PSU :) 
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November 4, 2011 1:07:33 AM

1050W ? That PSU can handle 3-way GTX 580s with extreme OCing. IF you're confused try out and PSU calculator and you'll find out that you need a lower wattage.
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November 4, 2011 1:12:37 AM

ilysaml said:
1050W ? That PSU can handle 3-way GTX 580s with extreme OCing. IF you're confused try out and PSU calculator and you'll find out that you need a lower wattage.


Yes, but i would rather go semi-modular (HX1050) than non-modular just for the sake of a clean build. The HX1050 isn't a whole lost more expensive in the end anyways, and at least this way i will have a PSU that will last for a while.
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November 4, 2011 1:16:36 AM

Ok, but consider than the upcoming GPUs will use less power consumption due to 28/22nm process, and my point of view is not being modular or non modular or semi modular, you can arrange your cables with a tie, my surprise goes for the useless higher wattage.

Anyway good luck with any of those.
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November 4, 2011 1:18:01 AM

jckstein said:
Yes, but i would rather go semi-modular (HX1050) than non-modular just for the sake of a clean build. The HX1050 isn't a whole lost more expensive in the end anyways, and at least this way i will have a PSU that will last for a while.


+1

I'm using the HX850 with a single 570 at the moment. I plan on SLI in a few months and i'm quite sure the 850 will be enough for it.
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November 4, 2011 1:56:58 AM

FYI my dual 580tgx setup maxs out at around 770watts from the ups (920 i7 12 gigs ram 1 hd.)
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November 4, 2011 2:24:59 AM

MagicPants said:
FYI my dual 580tgx setup maxs out at around 770watts from the ups (920 i7 12 gigs ram 1 hd.)



so wouldn't 850W be cutting it a little close?
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