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SLI GTX 660 TI (Power Question -- probably an easy answer)

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  • Power Supplies
Last response: in Components
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June 14, 2013 5:46:52 PM


Just got my second GTX 660 TI. My Power supply is 750 WATTS but is only has 2 6(+2) PCIE connectors... both of which are plugged into my ONE GTX 660 TI. The card came with Molex connectors to plug them into other spots in the PSU (sorry don't know the name). Is this going to cause an issue or do I need a new PSU with 4 6(+2) PCIE connectors.?

Thanks for the help.. I'm nervous to connect it VIA molex for some reason. Just want to make sure.

More about : sli gtx 660 power question easy answer

a c 2488 ) Power supply
June 14, 2013 6:31:09 PM

What brand of PSU.Connecting via molex is fine.
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June 14, 2013 6:33:25 PM

SR-71 Blackbird said:
What brand of PSU.Connecting via molex is fine.


Corsair Builder series. You understand what I'm asking? I might not be making a ton of sense explaining it.
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a c 2488 ) Power supply
June 14, 2013 6:34:35 PM

Corsair CX Series is for budget builds but it should power them thru molex.
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June 14, 2013 6:56:31 PM

SR-71 Blackbird said:
Corsair CX Series is for budget builds but it should power them thru molex.


yeah i know that now. didnt know when i bought it. i would replace it but it 2 months old id feel stupid
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Best solution

a c 1218 ) Power supply
June 14, 2013 7:16:13 PM

For a system using two GeForce GTX 660 Ti graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 650 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 four 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) 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 Corsair Builder Series CX750 (SKU# CP-9020015-NA), with its maximum combined +12 Volt continuous current rating of 62 Amps and with two (6+2)-pin PCI Express supplementary power connectors, is more than electrically sufficient to power your system configuration with two GeForce GTX 660 Ti graphics cards in 2-way SLI mode.

The CP-9020015-EU (i.e. European) model has four (6+2)-pin PCI Express supplementary power connectors. Here in North America we get screwed with only two.

I would recommend using a couple of PCI-E Y-splitters instead of the crap 4-pin Molex peripheral to PCI-E adapters. It makes for better cable management.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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June 14, 2013 7:26:17 PM

ko888 said:
For a system using two GeForce GTX 660 Ti graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 650 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 four 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) 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 Corsair Builder Series CX750 (SKU# CP-9020015-NA), with its maximum combined +12 Volt continuous current rating of 62 Amps and with two (6+2)-pin PCI Express supplementary power connectors, is more than electrically sufficient to power your system configuration with two GeForce GTX 660 Ti graphics cards in 2-way SLI mode.

The CP-9020015-EU (i.e. European) model has four (6+2)-pin PCI Express supplementary power connectors. Here in North America we get screwed with only two.

I would recommend using a couple of PCI-E Y-splitters instead of the crap 4-pin Molex peripheral to PCI-E adapters. It makes for better cable management.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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Wow. Thank you so much for the detailed response. I just ordered the aforementioned item. Should do the trick. Thank you again!!
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a b ) Power supply
June 17, 2013 9:02:01 AM

ko888 said:
For a system using two GeForce GTX 660 Ti graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 650 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 four 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) 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 Corsair Builder Series CX750 (SKU# CP-9020015-NA), with its maximum combined +12 Volt continuous current rating of 62 Amps and with two (6+2)-pin PCI Express supplementary power connectors, is more than electrically sufficient to power your system configuration with two GeForce GTX 660 Ti graphics cards in 2-way SLI mode.

The CP-9020015-EU (i.e. European) model has four (6+2)-pin PCI Express supplementary power connectors. Here in North America we get screwed with only two.

I would recommend using a couple of PCI-E Y-splitters instead of the crap 4-pin Molex peripheral to PCI-E adapters. It makes for better cable management.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...


ko888, excellent reply and have read several of your answers and they are always good. So this reply is to help, not criticize.
Corsair now offers the CX750 in a modular version (CX750M); here's the link at Newegg. It does have 4 PCI-E connectors.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
My guess is they listened to complaints from builders.
It is currently the same price as the non-modular version. I have not looked for any reviews nor do I know who manufactures it.
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a c 1218 ) Power supply
June 17, 2013 12:07:02 PM

nostall said:
ko888, excellent reply and have read several of your answers and they are always good. So this reply is to help, not criticize.
Corsair now offers the CX750 in a modular version (CX750M); here's the link at Newegg. It does have 4 PCI-E connectors.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
My guess is they listened to complaints from builders.
It is currently the same price as the non-modular version. I have not looked for any reviews nor do I know who manufactures it.


I was answering to the OP's specific model, not to all of the CX750 models in general. I already knew that the semi-modular model came with four PCI-E connectors. I also knew that the fully wired model came with a different number of PCI-E connectors based on the market they were being sold in.

The OEM for all of the current Corsair CX Series models is CWT (Channel Well Technology).
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a c 2488 ) Power supply
June 17, 2013 12:09:47 PM

koo888 is the best power supply adviser on the forum.
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a b ) Power supply
June 17, 2013 3:46:34 PM

ko888 said:
nostall said:
ko888, excellent reply and have read several of your answers and they are always good. So this reply is to help, not criticize.
Corsair now offers the CX750 in a modular version (CX750M); here's the link at Newegg. It does have 4 PCI-E connectors.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
My guess is they listened to complaints from builders.
It is currently the same price as the non-modular version. I have not looked for any reviews nor do I know who manufactures it.


I was answering to the OP's specific model, not to all of the CX750 models in general. I already knew that the semi-modular model came with four PCI-E connectors. I also knew that the fully wired model came with a different number of PCI-E connectors based on the market they were being sold in.

The OEM for all of the current Corsair CX Series models is CWT (Channel Well Technology).


Thanks ko888 and SR-71. Again, I thought I might have stumbled upon something new; apparently not. Ko888, thank you for the information about the OEM prefix; does this hold true for all Corsairs and/or anyother brands?
SR-71 (That is my most favorite aircraft, must be yours also), thanks for the info. re. ko. Seen your psu answers and ko's several times and I know you two know what you are talking about, some people don't. And I do my best not to offer advice beyond my knowledge and skill levels.
Gentlemen, thanks for being on this forum.
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a c 2488 ) Power supply
June 17, 2013 3:48:23 PM

I have learned a lot from koo888 , I studied plenty of his posts and absorb his knowledge.
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!