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

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Zac Seif

Zac Seif

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Jun 2, 2013
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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.
 
Solution
ko888
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...
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Zac Seif

Zac Seif

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Jun 2, 2013
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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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ko888

ko888

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Feb 18, 2009
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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=N82E16812198016
 
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Solution
Zac Seif

Zac Seif

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Jun 2, 2013
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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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nostall

nostall

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Nov 28, 2012
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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=N82E16817139051
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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ko888

ko888

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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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nostall

nostall

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Nov 28, 2012
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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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