Trying to understand PSU limitations

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Zhadara

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Feb 1, 2014
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10,510
Upgrading components on an older build and trying to understand PSU reqts.

I went big back in 2009 and have this Antec 750W Continuous PSU. http://www.newegg.com/Product/Product.aspx?Item=N82E16817371026

Specs list 4 12V circuits @25A each. Currently running 2xGTX 460s in SLI and am looking to upgrade to 2xGTX 760s in SLI. The 760s list a reqt of 30A on the 12V rail.

If I understand this all correctly, the 4 discrete 12V circuits @25A each should be enough to power dual 760s? Although 750W / 12V only = 62.5A which seems to be cutting it a bit fine?

CPU is an old i7-950 Bloomfield 3.06GHz LGA 1366 130W Quad-Core so I'm a bit concerned. If the PSU is light I will go with a dual GPU single card like the Mars, but trying to maximize my graphics per $ with the SLI config.

Any guidance would be welcome.
 
Solution
ko888
For a system using two GeForce GTX 760 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 700 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 50 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors. Some of the non-Reference Design GeForce GTX 760 cards have a single 8-pin (e.g. ASUS GTX 760 DirectCU II OC) or two 8-pin (e.g. MSI GTX 760 HAWK) or one 6-pin and one 8-pin (e.g. Gigabyte GTX 760 WindForce OC, EVGA GTX 760 SC w/ACX Cooler, MSI GTX 760 TwinFrozr Gaming) PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT...
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ko888

ko888

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Feb 18, 2009
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For a system using two GeForce GTX 760 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 700 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 50 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors. Some of the non-Reference Design GeForce GTX 760 cards have a single 8-pin (e.g. ASUS GTX 760 DirectCU II OC) or two 8-pin (e.g. MSI GTX 760 HAWK) or one 6-pin and one 8-pin (e.g. Gigabyte GTX 760 WindForce OC, EVGA GTX 760 SC w/ACX Cooler, MSI GTX 760 TwinFrozr Gaming) PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) is the most critical factor.

Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

The Antec EarthWatts 750 (EA-750) power supply unit, with its maximum combined +12 Volt continuous current rating of 56 Amps and with two 6-pin and two (6+2)-pin PCI Express supplementary power connectors, is sufficient to power your system configuration with two GeForce GTX 760 graphics cards in 2-way SLI mode.

During gaming the total draw from the +12V rails should be under 42 Amps unless you're doing some high overclocking of the CPU.
 
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