How to use second PSU?

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thepregnantgod

thepregnantgod

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Jan 12, 2010
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I am thinking to add a second PSU to my rig. My current one is a 1200watt Corsair Gold. The second one would be a 1000watt Kingston.

Asrock x79 Extreme 11
3930K oc'd to 4.9ghz
Kraken x60
GTX 670x3 triple sli
6 Vertex 4
24 3-4 TB green drives
2 SAS expander cards
fan controller
4-6 140mm fans

Questions:

1. Should I connect the GTX670s to the secondary PSU alone? Will the delay stop them from booting in sync with everything else?
2. Should I keep all the main stuff connected to the 1200watt, and then just use the extra to power all the drives/fans?
3. As above, if the SAS cards are powered via mobo but the drives are powered via secondary PSU, will they detect them in time upon boot?

Anyone with experience and time, please enlighten me. I've not used a secondary PSU because I normally keep my main rig and my media server separate but for space reasons, I'm combining them.

4. Can a single outlet handle 2200 watts pulling (through UPSes) without tripping a breaker?
 
Solution
G
1. Presuming the second PSU is connected to the first one, the second one will power up within a couple seconds.
2. That's what I'd do.
3. Absolutely because the drives will be up and running before POST has completed.
4. A UPS only is 60-65% efficient; if the whole system draws more than 1500 watts, then the breaker will trip. However the system won't draw that much power; the 3 GTX 670 may draw slightly over 600W at peak and the rest of the system probably no more than 250W. You need 2 PSUs for the connectors, not for the total power requirements.
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GhislainG

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Jul 16, 2008
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1. Presuming the second PSU is connected to the first one, the second one will power up within a couple seconds.
2. That's what I'd do.
3. Absolutely because the drives will be up and running before POST has completed.
4. A UPS only is 60-65% efficient; if the whole system draws more than 1500 watts, then the breaker will trip. However the system won't draw that much power; the 3 GTX 670 may draw slightly over 600W at peak and the rest of the system probably no more than 250W. You need 2 PSUs for the connectors, not for the total power requirements.
 
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GhislainG

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Jul 16, 2008
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I agree the system doesn't need 2 PSUs, but it can be done. He has to have a pretty big case to fit 24 hard disks and most server cases are designed for dual PSUs..
 
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thepregnantgod

thepregnantgod

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I have the Lian-Li D8000 - so fitting 2 PSUs is not a problem. I have the Add2PSU chip so I can connect both. What I was most concerned about was what to use the 2PSU to power.

And yes, probably power wise I don't need two PSUs, but as one poster said the connectors are limited and I've burnt two drives daisy chaining off a 750watt PSU (in my media server - no GTX670s but 24 drives).
 
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