GTX 550 ti SLI PSU requirements?

[ndurin]

So I have 2 GTX 550 ti's in SLI, 400w is recommended for one 550 ti, and each 550 ti takes around 120w at full load. So I would need around 520w right? I was just wondering if this PSU is sufficient? http://www.newegg.ca/Product/Product.aspx?Item=N82E16817139001




Rest of system specs:

CPU - i5 2500k
MOBO - BIOSTAR TP67XE
2x 1TB HDD @ 7200RMP
1x Intel SSD
2x 4GB RAM = 8GB of RAM DDR3

Fans
3x 80mm 1 with led's
2x 120mm
1x 200mm

1 DVD RW drive ( almost never plugged in )

I might get liquid cooling for my CPU, a closed loop system

Maybe something like this
http://www.newegg.ca/Product/Product.aspx?Item=N82E16835103179

So is that PSU good? Are the components high quality? How long will it last? etc....?

 

[iceclock]

1 requires 400watts. so im guessing a 550 watt should do it.

 

[iceclock]

should in theory be enought.

but id double check.

 

[ko888]

For a system using two GeForce GTX 550 Ti graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 500 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 38 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!!! Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most important factor.

Overclocking of the CPU and/or GPU(s) will 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 Corsair HX Series 520 Watt (CMPSU-520HX), with its maximum combined +12 Volt continuous current rating of 40 Amps and with two 6-pin PCI Express supplementary power connectors, is sufficient to power your system configuration with two GeForce GTX 550 Ti graphics cards in 2-way SLI mode.

 

[iceclock]

where do u get these infos ko. like ur pulling it outt of a manual.

 

[ndurin]

For a system using two GeForce GTX 550 Ti graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 500 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 38 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!!! Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most important factor.

Overclocking of the CPU and/or GPU(s) will 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 Corsair HX Series 520 Watt (CMPSU-520HX), with its maximum combined +12 Volt continuous current rating of 40 Amps and with two 6-pin PCI Express supplementary power connectors, is sufficient to power your system configuration with two GeForce GTX 550 Ti graphics cards in 2-way SLI mode.

Thank you, that helped a lot!

 

[ndurin]

Best answer selected by Ndurin.

 

[ko888]

where do u get these infos ko. like ur pulling it outt of a manual.

I have formal EE (Electrical Engineering) training and I know how graphics card manufacturers determine the system power supply requirements for their graphics cards.

The measured power consumption for many specific graphics card brand and models are easily available from graphics card reviews that don't measure system power draw and only measure pure graphics card power draw.

 

[iceclock]

well that would explained it, u shur know ur electrical stuff

 

[Steelmagnet]

I have formal EE (Electrical Engineering) training and I know how graphics card manufacturers determine the system power supply requirements for their graphics cards.

The measured power consumption for many specific graphics card brand and models are easily available from graphics card reviews that don't measure system power draw and only measure pure graphics card power draw.

I have a 3 year old 550W power supply BFG Tech (BFGR550WGSPSU) it says +12V1 18A and + 12V2 18A 404W combined between the two rails. I am hoping to build a similar set up except with a EVGA 550ti single card. I don't know how the two rail PSU's work, does this card have 18 or 36 amps available for the recommended 24 Amps for the card. Would this card be enough? Your help would be appreciated.