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Will 600W power GTX 460 SLI?

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January 11, 2012 6:12:48 PM

Here are my specs, I know it might not work but...
i7 920 3.2 Ghz
1 SSD
1 HDD
4 Case fans
OCZ ModXStream Pro 600W Modular High Performance Power Supply compatible with Intel Sandybridge Core i3 i5 i7 and AMD Phenom/ 80+ Rating
GTX 460 HAWK SLI

More about : 600w power gtx 460 sli

January 11, 2012 6:19:44 PM

Looking at the specs for that PSU, I'd say probably not. It's not the wattage that's the issue, it's your amps. That PSU has 2 12v rails rated at 25a each, and I believe (if memory serves), your average reference 460 recommends 36 amps each. You also have the added annoyance of only having two PCIe connectors, you'd have to get less-than-ideal molex to 6 pin adapters to make up the missing two, but again you'd be running into amperage problems imo. You have enough headroom to overclock the 460 if you're looking for increased performance without the need to SLI.
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a c 1167 ) Power supply
January 11, 2012 6:29:38 PM

For a system using two GeForce GTX 460 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 620 Watt or greater power supply that has a combined +12 Volt continuous current rating of 37 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors.

Your OCZ ModXStream Pro Series 600W (OCZ600MXSP), with its combined +12 Volt continuous current rating of 42 Amps and one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is electrically sufficient to power your system with two reference clocked GeForce GTX 460 graphics cards. You'll need to use two dual 4-pin Molex peripheral to 6-pin PCIe dongles.

There isn't enough spare capacity to do any overclocking, though.
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January 11, 2012 6:33:30 PM

ko888 said:
For a system using two GeForce GTX 460 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 620 Watt or greater power supply that has a combined +12 Volt continuous current rating of 37 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors.

Your OCZ ModXStream Pro Series 600W (OCZ600MXSP), with its combined +12 Volt continuous current rating of 42 Amps and one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is electrically sufficient to power your system with two reference clocked GeForce GTX 460 graphics cards. You'll need to use two dual 4-pin Molex peripheral to 6-pin PCIe dongles.

There isn't enough spare capacity to do any overclocking, though.


Thank you for such a thorough answer, you said that there wouldn't be any more room for overclocking, but what if my GPU loads are up to 100% both +the CPU Usage? Would that complicate the PSU itself?
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a b ) Power supply
January 11, 2012 6:40:08 PM

Getting a bigger psu is definately a good thing, and would give you a little wiggle room, but it is unlikely that your system is in eminent danger. If you do a lot of heavy gaming, then you may consider it sooner rather than latter.

You can also lightly underclock your cards so that they won't draw max power until you have a chance to grab something bigger.
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a c 243 ) Power supply
January 11, 2012 6:46:20 PM

An overclocked I7 and a pair of overclocked 460's will put a hurting on it

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a c 1167 ) Power supply
January 11, 2012 7:03:42 PM

halodude23 said:
Thank you for such a thorough answer, you said that there wouldn't be any more room for overclocking, but what if my GPU loads are up to 100% both +the CPU Usage? Would that complicate the PSU itself?

The biggest problem with the OCZ ModXStream Pro Series 600W (OCZ600MXSP) is its +12V rail distribution.

+12V rail distribution, each rail is current limted to a maximum of 25 Amps and a combined maximum of 42 Amps:

+12V1: The cables that are permanently attached to the power supply (i.e. ATX 20+4 pin connector, 4-pin ATX 12V connector, 8-pin EPS12V connector)

+12V2: The cables from the modular cabling system (i.e. PCIe supplementary power connectors, SATA power connectors, 4-pin Molex peripheral power connectors, FDD power connector)

Having both graphics cards obtaining all of their power from the +12V2 rail under a full gaming load will mean that the graphics cards alone will be drawing almost 20 Amps leaving just 5 Amps to power the SSD, HDD, CPU cooling fan and case fans. If the current draw on this rail exceeds the maximum 25 Amps allowed the OCP (Over Current Protection) circuit should kick in to prevent the power supply from burning out.

The CPU is being powered from the +12V1 rail.

I would be considering a good 750 Watt power supply if I were you. At least it would have at least four PCIe supplementary power connectors and enough spare capacity for overclocking both the CPU and GPUs.
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January 11, 2012 7:07:01 PM

ko888 said:
The biggest problem with the OCZ ModXStream Pro Series 600W (OCZ600MXSP) is its +12V rail distribution.

+12V rail distribution, each rail is current limted to a maximum of 25 Amps and a combined maximum of 42 Amps:

+12V1: The cables that are permanently attached to the power supply (i.e. ATX 20+4 pin connector, 4-pin ATX 12V connector, 8-pin EPS12V connector)

+12V2: The cables from the modular cabling system (i.e. PCIe supplementary power connectors, SATA power connectors, 4-pin Molex peripheral power connectors, FDD power connector)

Having both graphics cards obtaining all of their power from the +12V2 rail under a full gaming load will mean that the graphics cards alone will be drawing almost 20 Amps leaving just 5 Amps to power the SSD, HDD, CPU cooling fan and case fans. If the current draw on this rail exceeds the maximum 25 Amps allowed the OCP (Over Current Protection) circuit should kick in to prevent the power supply from burning out.

The CPU is being powered from the +12V1 rail.

I would be considering a good 750 Watt power supply if I were you. At least it would have at least four PCIe supplementary power connectors and enough spare capacity for overclocking both the CPU and GPUs.


Well, instead of 750W, would 700W be okay? I won't overclock the GPU at all I mean.
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a c 1167 ) Power supply
January 11, 2012 7:10:34 PM

halodude23 said:
Well, instead of 750W, would 700W be okay? I won't overclock the GPU at all I mean.

Which 700W PSU in particular? Do you have a brand and model in mind?

All 700W PSUs are not created equal. Some can't even deliver the power specified on their label.
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a b ) Power supply
January 11, 2012 7:11:18 PM

There isn't always a huge price difference between 700 and 750.
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January 11, 2012 7:11:47 PM

ko888 said:
Which 700W PSU in particular? Do you have a brand and model in mind?

All 700W PSUs are not created equal. Some can't even deliver the power specified on their label.


OCZ ModXStream Pro 700W Modular High Performance Power Supply
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a c 1167 ) Power supply
January 11, 2012 7:20:21 PM

halodude23 said:
OCZ ModXStream Pro 700W Modular High Performance Power Supply

The OCZ ModXStream Pro Series 700W (OCZ700MXSP) has exactly the same problems and limitations as the 600 Watt version that you currently have.

It has the same number of PCIe supplementary power connectors, same +12V rail distribution, same 25 Amp current limit on each +12V rail.
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a c 243 ) Power supply
January 11, 2012 7:26:26 PM


Have to add the follow up

http://www.hardocp.com/article/2009/03/03/ocz_modxstrea...

"As such, the ModXStream Pro 700w is a capable power supply at 40c, but not at 45c where we make our cutoff and there are units that do make this cutoff including OCZ's own PC Power & Cooling Silencer 750. So while the OCZ ModXStream Pro 700w did not pass our parameters it certainly belongs to the group of units that were "good," yet non-passing, as opposed to the units that were just a waste of good solder."

I can't be that slow ko ;) 
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a c 243 ) Power supply
January 11, 2012 7:30:44 PM

ko888 said:
The biggest problem with the OCZ ModXStream Pro Series 600W (OCZ600MXSP) is its +12V rail distribution.

+12V rail distribution, each rail is current limted to a maximum of 25 Amps and a combined maximum of 42 Amps:

+12V1: The cables that are permanently attached to the power supply (i.e. ATX 20+4 pin connector, 4-pin ATX 12V connector, 8-pin EPS12V connector)

+12V2: The cables from the modular cabling system (i.e. PCIe supplementary power connectors, SATA power connectors, 4-pin Molex peripheral power connectors, FDD power connector)

Having both graphics cards obtaining all of their power from the +12V2 rail under a full gaming load will mean that the graphics cards alone will be drawing almost 20 Amps leaving just 5 Amps to power the SSD, HDD, CPU cooling fan and case fans. If the current draw on this rail exceeds the maximum 25 Amps allowed the OCP (Over Current Protection) circuit should kick in to prevent the power supply from burning out.

The CPU is being powered from the +12V1 rail.

I would be considering a good 750 Watt power supply if I were you. At least it would have at least four PCIe supplementary power connectors and enough spare capacity for overclocking both the CPU and GPUs.

So is the motherboard , the cards would draw some of thier power from the slots, but I agree that an upgrade is in order
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a b ) Power supply
January 11, 2012 7:55:13 PM

delluser1 said:
Have to add the follow up

http://www.hardocp.com/article/2009/03/03/ocz_modxstrea...

"As such, the ModXStream Pro 700w is a capable power supply at 40c, but not at 45c where we make our cutoff and there are units that do make this cutoff including OCZ's own PC Power & Cooling Silencer 750. So while the OCZ ModXStream Pro 700w did not pass our parameters it certainly belongs to the group of units that were "good," yet non-passing, as opposed to the units that were just a waste of good solder."

I can't be that slow ko ;) 


I did indeed see that.
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January 12, 2012 4:55:21 AM

halodude23 said:
Here are my specs, I know it might not work but...
i7 920 3.2 Ghz
1 SSD
1 HDD
4 Case fans
OCZ ModXStream Pro 600W Modular High Performance Power Supply compatible with Intel Sandybridge Core i3 i5 i7 and AMD Phenom/ 80+ Rating
GTX 460 HAWK SLI



no it will not, but here is better psu



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

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

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

there are a lot more better psus out there, if u have time to search in google.

recomended brands,seasonic, antec,corsair,tharmaltake. and xfx.don't go near to cooler master.
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