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PSU Requirement (checked sticky already)

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  • Power Supplies
  • Gtx
  • Green
  • SLI
  • Components
  • Product
Last response: in Components
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June 14, 2011 3:07:02 PM

I'm planning to get a GeForce GTX 570 (Fermi) card

I plan to SLI eventually (year or two, idk).
To future proof it (adequately, on a tight budget), should it go with:
Antec Earthwatts EA-650 Green
-or-
Antec Earthwatts EA-750
Thanks!

More about : psu requirement checked sticky

June 14, 2011 5:25:16 PM

king smp said:
Since you plan to SLI I would go with the higher wattage
Nvidia recommends minimal 55w for single card as per their website
http://www.nvidia.com/object/product-geforce-gtx-570-us...
so you would want 750 watts or more
also check amperage on the 12v rails


OK, looking at the 750 watt PSU and it has 4 +12V rails @25A each. The GPU requires 38A minimum. Don't know if this is passing or failing (50 or 100A total, or only 25A).
EDIT: (On Antec's page, it has 56A output rating overall, is this ok for a future with 2 cards that have a 38A min each?)

First build, and have most other research done, but apparently not PSU's.
Thanks again!
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a c 91 ) Power supply
June 14, 2011 6:01:53 PM

It is definitely not 100A on the 12V rail (that will make it a 1200W PSU). Although 750W is okay for a 570 SLI rig, it is recommended to step up a bit and consider getting an 850W unit. Extra room for overclocking.
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a c 91 ) Power supply
June 14, 2011 6:07:26 PM

A small doubt. I think the Antec unit does not feature enough connectors for going SLI with those 570's. In that case, i'll recommend you to get the Corsair TX 750 V2. Comparing prices on newegg, it is just an extra 10 bucks. And IMO, it is better compared to the Antec EA 750.
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June 14, 2011 6:43:21 PM

I was actually looking at the Corsair TX 750 V2.2 as well. Wasn't sure either about the PCI-e on antec being half 6-pin and half 6+2-pin (as I said, not really sure what I need for PSU as the card only says it needs 2 PCIe)
Also, not planing on overclocking very high, and won't be at all for probably 9 months or so.

Thoughts? (i.e. Antec, or Corsair v2 or v2.2)
Corsair compaired
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a c 91 ) Power supply
June 14, 2011 6:54:13 PM

Well my mistake. It looks like a GTX 570 card requires two 6 pin power connectors. The Antec unit does has two 6+2 pin connectors and two 6 pin connectors. Thus it has enough for a couple of GTX 570's. The Corsair model has four 6+2 pin connectors.
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June 14, 2011 7:29:52 PM

So would either PSU work then? Is 6+2 backward compatible with 6 pin (if backward compatible is the right phrase)?
Also, wondering if the Corsair 60A rating with one +12v rail is worth $10 more than the Antec 56A rating with four +12v rails.
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Best solution

a c 91 ) Power supply
June 14, 2011 7:53:01 PM

I like single rail designs better (keeps them less complicated). Also, the Corsair unit carries an 80+ Bronze certification as opposed to the normal 80+ on the Antec. Both units have similar reviews. One of the premiere PSU reviewing site rates the Corsair model as better compared to the Antec model -

www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&...

www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&...

My opinion is that the Corsair TX 750 V2 is worth the extra 10$ and is the one to go for.
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June 14, 2011 8:01:32 PM

Best answer selected by doublepedaldylan.
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June 14, 2011 8:01:53 PM

That's the way I was leaning, needed motivation to jump. Thanks!
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