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How much wattage do I need?

Last response: in Components
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September 13, 2013 9:17:06 AM

I'm looking to upgrade my graphics card in my system and am trying to figure out if I need to upgrade my PSU as well. I'm getting different results depending on the PSU calculator I use so I'm hoping to get some insight here. the graphics card I'm wanting to get is a GTX 670. I currently have an OCZ ModXStream Pro 500W PSU.

MB: Asus Rampage II Gene
CPU: Intel i7-920 (LGA 1366)
Memory: 6GB DDR3 (3x2GB)
HDD: 2x SSD
Optical Storage: DVD-RW
Fans: 4x120mm

That's about all I can think of. Let me know if I'm forgetting something.

EDIT: I'm an idiot. I mean to say I'm considering the GTX 760, not the 670.

More about : wattage

a b ) Power supply
a b U Graphics card
September 13, 2013 9:23:59 AM

Your current PSU is sufficient ;) 
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a c 1196 ) Power supply
a c 560 U Graphics card
a b B Homebuilt system
September 13, 2013 9:27:12 AM

For a system using a single GeForce GTX 670 graphics card NVIDIA specifies a minimum of a 500 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 30 Amps or greater and that has at least two 6-pin 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) 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 OCZ ModXStream Pro 500W (OCZ500MXSP) power supply unit, with its maximum combined +12 Volt continuous current rating of 36 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is sufficient to power your system configuration with a single GeForce GTX 670 graphics card.
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a b ) Power supply
a b U Graphics card
September 13, 2013 9:28:47 AM

You will be fine to use the OCZ 500W with the GTX670, total wattage of your system will be less than 400W even you OC the CPU( i7-920 use 130W, gtx670 use 170W ).
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September 13, 2013 10:02:24 AM

Thanks for all the answers guys but I just realized I made a mistake in my original post. The GPU I'm considering is the GTX 760, not the 670. Does that make any difference?
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a c 1196 ) Power supply
a c 560 U Graphics card
a b B Homebuilt system
September 13, 2013 10:04:42 AM

In terms of system power requirement, no.

For a system using a single GeForce GTX 760 graphics card NVIDIA specifies a minimum of a 500 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 30 Amps or greater and that has at least two 6-pin PCI Express supplementary power connectors.
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