750w psu enough for SLI upgrade

gold_28 · Nov 30, 2014

Current system:

i7 4770k - not OC
212 evo cpu cooler
gtx 780 Gigabyte ghz edition - Base / Boost clock：1019 / 1071 MHz
8gb DDR3 1600 Mhz RAM
Corsair CXM 750W 80 Plus Bronze PSU
250GB SSD
1TB HDD
4 fans

I plan on buying the exact same GPU for SLI configuration. The other parts will remain the same.
Would i need to purchase a higher PSU? I was told the gtx 780 requires 250W, so for two it's 500w with 250w for the system?
I'm hoping i have just enough power for SLI or would it be risky to have just enough? Could it damage the components?

Dunlop0078 · Nov 30, 2014

Yes it should be enough but i do not have a lot of confidence in the cx750 especially with two 780s hooked up to it. Its not a very good power supply.

ko888 · Nov 30, 2014

For a system using two GeForce GTX 780 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 850 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 65 Amps or greater and that has at least two 75 Watt 6-pin and two 150 Watt 8-pin PCI Express supplementary power connectors. (Minimum system power requirement based on a PC configured with an Intel Core i7 3.2GHz 130 Watt TDP processor.)

Corsair CX750 (SKU# 75-001447 / CP-9020015)
• OEM: CWT (Channel Well Technology)
• maximum combined +12 Volt continuous current rating of 62 Amps <===== Insufficient
• four (6+2)-pin PCI Express supplementary power connectors
• Modular Output Cables: No
• Official Intel Haswell Compliance: Yes
• 80 PLUS BRONZE Efficiency Certification
• 3 Year Limited Warranty

Zerk2012 · Nov 30, 2014

Same as above not a clue why people think just because it says Corsair it's a good power supply, they made their good name from Seasonic rebrands and now just are making a killing selling mostly a good door stop.

gold_28 · Nov 30, 2014

ko888 :

For a system using two GeForce GTX 780 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 850 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 65 Amps or greater and that has at least two 75 Watt 6-pin and two 150 Watt 8-pin PCI Express supplementary power connectors. (Minimum system power requirement based on a PC configured with an Intel Core i7 3.2GHz 130 Watt TDP processor.)

Corsair CX750 (SKU# 75-001447 / CP-9020015)
• OEM: CWT (Channel Well Technology)
• maximum combined +12 Volt continuous current rating of 62 Amps <===== Insufficient
• four (6+2)-pin PCI Express supplementary power connectors
• Modular Output Cables: No
• Official Intel Haswell Compliance: Yes
• 80 PLUS BRONZE Efficiency Certification
• 3 Year Limited Warranty

could you recommend me a PSU which meets those conditions?

gold_28 · Nov 30, 2014

nostall :

Thnx for the info but they seem to be out of stock in the UK. Checked on Amazon as well.

Dunlop0078 · Nov 30, 2014

Zerk2012 :

gold_28 :

Yah you might want to wait a few days everything is sold out cause of black friday.

ko888 · Nov 30, 2014

gold_28 :

XFX PRO Series 850W Core Edition (P1-850S-NLB9)
• OEM: Seasonic
• maximum combined +12 Volt continuous current rating of 70 Amps
• two 75-Watt 6-pin and two 150-Watt (6+2)-pin PCI Express supplementary power connectors
• Modular Output Cables: No
• Official Intel Haswell Compliance: Yes
• 80 PLUS BRONZE Efficiency Certification
• 5 Year Limited Warranty
http://uk.pcpartpicker.com/part/xfx-power-supply-p1850snlb9

XFX 850W XXX Edition Semi Modular Output Cables (P1850XXXB9)
• OEM: Seasonic
• maximum combined +12 Volt continuous current rating of 70 Amps
• four 150-Watt (6+2)-pin PCI Express supplementary power connectors
• Semi-Modular Output Cables: Yes
• Official Intel Haswell Compliance: Yes
• 80 PLUS BRONZE Efficiency Certification
• 5 Year Limited Warranty
http://uk.pcpartpicker.com/part/xfx-power-supply-p1850xxxb9

SeaSonic M12-II EVO 850W Bronze (SS-850AM2)
• OEM: Seasonic
• maximum combined +12 Volt continuous current rating of 70 Amps
• six 150-Watt (6+2)-pin PCI Express supplementary power connectors
• Full-Modular Output Cables: Yes
• Official Intel Haswell Compliance: Yes
• 80 PLUS BRONZE Efficiency Certification
• 5 Year Limited Warranty
http://uk.pcpartpicker.com/part/seasonic-power-supply-ss850am2

EVGA SuperNOVA 850 G2 (220-G2-0850-XR)
• OEM: Super Flower
• maximum combined +12 Volt continuous current rating of 70.8 Amps
• six 150-Watt (6+2)-pin PCI Express supplementary power connectors
• Full-Modular Output Cables: Yes
• Official Intel Haswell Compliance: Yes
• 80 PLUS GOLD Efficiency Certification
• 10 Year Limited Warranty
http://uk.pcpartpicker.com/part/evga-power-supply-220g20850xr

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750w psu enough for SLI upgrade

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Dunlop0078

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Zerk2012

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gold_28

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Dunlop0078

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