PSU and SLI questions

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revaew

revaew

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Jan 30, 2013
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Right now I have a corsair tx750 and a 780ti. I have another 780ti coming and apparently the amps/volts is insufficient for maintaining SLI. I know I need more watts, but my question is how do I look at the specifications of a PSU and tell if it sustains SLI etc?

Thanks
 
Solution
ko888


NVIDIA's 42 Amp recommendation for a single reference design GeForce GTX 780 Ti is exaggerated by at least 5 Amps. 37 Amps or greater for a system with a single GeForce GTX 780 Ti is what I see from actual measured maximum graphics card power consumption values.

If a single reference design GeForce GTX 780 Ti can draw 22 Amps from the +12V rail then the second card may draw 20 Amps. Add 15 Amps for a PC configured with an Intel Core i7 3.2GHz 130 Watt TDP processor and the total is 57 Amps.

I would think your PSU would be capable of handling that without any problems.
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ko888

ko888

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Feb 18, 2009
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What is your complete system's spec's?

What is the exact SKU number of the Corsair TX750?
 
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ko888

ko888

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SKU = Stock Keeping Unit is an Inventory Management term

Corsair TX Series 750W models:

• SKU# CMPSU-750TX (Discontinued)

• SKU# CMPSU-750TX-C (Discontinued)

• TX750 (SKU# 75-001309 / CP-9020042)

• SKU# CMPSU-750TXM (Discontinued)

• TX750M (SKU# 75-001310 / CP-9020040)
 
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ko888

ko888

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Corsair TX750 (SKU# 75-001309 / CP-9020042)
• OEM: Chicony Power Technology
• maximum combined +12 Volt continuous current rating of 62 Amps
• four (6+2)-pin PCI Express supplementary power connectors

If the two Galaxy GeForce GTX 780 Ti 3GB reference design cards are kept at their stock clock speeds and the CPU's clock speed is kept below 4.6 GHz then it should work with no problem.
 
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ko888

ko888

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The PSU's maximum combined +12 Volt continuous current rating is the critical spec in combination with a sufficient number and type of PCI Express supplementary power connectors.
 
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revaew

revaew

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How do I know the continuous current is enough? Is this specified in the GPU specifications? I see where it says the amps for one card, but how do you know for 2?

Thanks?
 
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ko888

ko888

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NVIDIA only provides the recommended minimum system PSU wattage, +12 Volt continuous current rating and number and types of PCI Express supplementary power connectors for a single graphics card to their AIB (i.e. Add-In Board) partners. Minimum system power requirement based on a PC configured with an Intel Core i7 3.2GHz 130 Watt TDP processor.

Some reviewers that actually have the technical know-how and ability to measure actual graphics card power consumption will publish the power consumption value that can then be used to calculate the extra +12V current required for the second graphics card. Usually the secondary card in the 2-way SLI set uses around 80% to 90% of the power that the primary graphics card uses.
 
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ko888

ko888

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Feb 18, 2009
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NVIDIA's 42 Amp recommendation for a single reference design GeForce GTX 780 Ti is exaggerated by at least 5 Amps. 37 Amps or greater for a system with a single GeForce GTX 780 Ti is what I see from actual measured maximum graphics card power consumption values.

If a single reference design GeForce GTX 780 Ti can draw 22 Amps from the +12V rail then the second card may draw 20 Amps. Add 15 Amps for a PC configured with an Intel Core i7 3.2GHz 130 Watt TDP processor and the total is 57 Amps.

I would think your PSU would be capable of handling that without any problems.
 
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