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Sufficient Power Supply for GTX660?

Last response: in Components
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October 24, 2013 2:42:12 PM

I'm trying to determine if my power supply is sufficient for my new GTX660 card. I'm concerned that I don't have enough AMPs on my 12V rail. Card calls for 24, but it looks like I only have 22? I have no other other devices plugged into the PSU besides my 2 case fans.

Current power supply:
Antec EarthWatts EA-500D Green 500W

CPU:
Intel i7 870

New Graphics Card:
EVGA GTX 660 SC

Is my current PSU enough for the GTX660? Or do I need to look into getting a better PSU with better amperage?

Any clarification would be greatly appreciated! Don't won't to damage any of my existing or new components.
a c 2282 ) Power supply
a c 120 å Intel
a c 983 à CPUs
a c 859 U Graphics card
October 24, 2013 2:43:32 PM

Get this unit made by the best SEASONIC.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($44.99 @ NCIX US)
Total: $44.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-10-24 17:43 EDT-0400)


+3.3V@24A, +5V@24A, +12V@44A, -12V@0.5A, +5VSB@2.5A
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Best solution

a c 1200 ) Power supply
a b å Intel
a c 107 à CPUs
a c 563 U Graphics card
October 24, 2013 2:55:37 PM

For a system using a single GeForce GTX 660 (non-Ti) graphics card NVIDIA specifies a minimum of a 450 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 24 Amps or greater and that has at least one 6-pin PCI Express supplementary power connector.

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) rated at 45°C - 50°C ambient temperature, 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 EA-500D Green power supply unit, with its maximum combined +12 Volt continuous current rating of 37 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single GeForce GTX 660 (non-Ti) graphics card.
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October 24, 2013 3:33:10 PM

@Ko888 thanks for the reply!
Sounds like I am good to go with my EA-500D.

How exactly is the 37 Amps value calculated? Is that a combined value of the two values?

I see on the Newegg specs:
+12V1@22A, +12V2@22A, -12V@0.8A,

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a c 1200 ) Power supply
a b å Intel
a c 107 à CPUs
a c 563 U Graphics card
October 24, 2013 3:38:48 PM

rawrbot said:
@Ko888 thanks for the reply!
Sounds like I am good to go with my EA-500D.

How exactly is the 37 Amps value calculated? Is that a combined value of the two values?

I see on the Newegg specs:
+12V1@22A, +12V2@22A, -12V@0.8A,



Published by Antec in their product flyer.

+12V1, 12V2 Maximum combined output: 444W

444 Watts ÷ 12 Volts = 37 Amps

http://www.antec.com/pdf/flyers/EA500D_flyer_EN.pdf
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