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2xGTX 660 SLI power supply requirements

Last response: in Graphics & Displays
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May 13, 2013 7:25:06 AM

Motherboard: ASROCK Z77 EXTREME4 /Z77/1155
CPU: I5-3350P /3.1G/6MB/BOX/LGA1155
GPU: 2x PALIT GTX660 OC 2GB D5
RAM: CORSAIR 2x4GB Vengeance DDR3 1600Mhz 1.5V
PSU: SEASONIC SS-620GB BRONZE
CASE: CM ELITE 430

1: Is this power supply enough for this kind of system
2: Is the Sli gtx660 better choise then the single gtx660ti for gaming
a c 107 ) Power supply
May 13, 2013 7:27:49 AM

1. Yes.
2. Performance-wise, a GTX 660 SLI will best a GTX 680. But we usually recommend a single card over SLI. In your case, up to you.
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May 13, 2013 7:35:46 AM

ksham said:
1. Yes.
2. Performance-wise, a GTX 660 SLI will best a GTX 680. But we usually recommend a single card over SLI. In your case, up to you.



then what about an 660ti OC and in the near future i will add one more ? since the ti max out all the games now i will have alot of time to upgrade to SLI
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a c 107 ) Power supply
May 13, 2013 7:40:49 AM

Well, more SLI gives you more issues and less gain. 2-way SLI is fine for the GTX 660 Ti. The same SLI issues with your GTX 660 SLI may also be present in the GTX 660 Ti SLI. But a 3-way SLI is pointless. You get almost no gain. Maybe a +5% performance boost if you are really lucky.
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May 13, 2013 7:47:12 AM

ksham said:
Well, more SLI gives you more issues and less gain. 2-way SLI is fine for the GTX 660 Ti. The same SLI issues with your GTX 660 SLI may also be present in the GTX 660 Ti SLI. But a 3-way SLI is pointless. You get almost no gain. Maybe a +5% performance boost if you are really lucky.


i was talking about switching 660 with the 660ti sli ? will this power supply be enough for the ti sli ?
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a b ) Power supply
May 13, 2013 7:52:17 AM

Yes, it wil be enough. And btw, I have two EVGA 660's in SLI and have not had any issues with it at all. Cost less than a 680 at about the same performance. But, I must say I didn't start with two of them, just one. Bought another for another build and just wanted to try sli. Like it a lot so I kept them in SLI and bought another for the other build.
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a b ) Power supply
May 13, 2013 7:53:09 AM

Atanas Vaklinov said:
ksham said:
Well, more SLI gives you more issues and less gain. 2-way SLI is fine for the GTX 660 Ti. The same SLI issues with your GTX 660 SLI may also be present in the GTX 660 Ti SLI. But a 3-way SLI is pointless. You get almost no gain. Maybe a +5% performance boost if you are really lucky.


i was talking about switching 660 with the 660ti sli ? will this power supply be enough for the ti sli ?


I'm using a 620w PSU on a 660Ti SLi rig, I don't know what the previous poster is on about with the "we" business because they can't speak for all of us and shouldn't be so arrogant as to think that they can. SLi has had no issues for me and I've been doing it for several years with different rigs.
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Best solution

a c 1167 ) Power supply
May 13, 2013 9:28:28 AM

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) 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 Seasonic S12II-620 Bronze (SS-620GB), with its maximum combined +12 Volt continuous current rating of 48 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is electrically sufficient to power your system configuration with two GeForce GTX 660 Ti graphics cards in 2-way SLI mode. You will need to use a couple of PCI-E power adapter cables.
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a c 107 ) Power supply
May 13, 2013 9:38:04 AM

Mousemonkey said:
I don't know what the previous poster is on about with the "we" business because they can't speak for all of us and shouldn't be so arrogant as to think that they can.

I didn't mean to. My apologies. I'll be more careful about that next time. I was trying to say that most recommend a single card.
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a b ) Power supply
May 13, 2013 9:54:28 AM

ksham said:
Mousemonkey said:
I don't know what the previous poster is on about with the "we" business because they can't speak for all of us and shouldn't be so arrogant as to think that they can.

I didn't mean to. My apologies. I'll be more careful about that next time. I was trying to say that most recommend a single card.


Apology accepted. ;) 

It's usually the ones who have had issues that tend to be vocal, that doesn't mean that everyone has issues or wouldn't make the recommendation.
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