Recommended wattage for SLI?

[DragonYiffer]

Hello,

I currently have the EVGA GTX 560 SC (Non TI version) and I would like to run it in 2-way SLI.

I currently have a Retail Plus 700 watt power supply. 2/2 of my PCIE pin connectors are in use with my one card, so putting the second card would mean using 2 dual molex to PCIE to have it power.

Here is a link to my PSU:
http://www.retailplus.com/products/550w-power-supply/retail-plus-700w-power-supply

I may be getting an 850 watt PSU for christmas from a brand like Corsair,MSI,Cooler master. so this PSU won't be in forever.

Will my Current PSU be able to handle it?

 

[pro-gamer]

yes, it can handle

 

[geekapproved]

I wouldn't use that psu to power ONE GTX560, let a lone TWO. Get yourself a good fire extinguisher and keep it handy if you try that.

And no you cannot use 2 pci-e to molex to power a card. You can use one on each card, but not two on one card.

 

[Mousemonkey]

And no you cannot use 2 pci-e to molex to power a card. You can use one on each card, but not two on one card.

Have you actually tried running two GTX560Ti's that way?

 

[pro-gamer]

Have you actually tried running two GTX560Ti's that way?

i think he did haha!

 

[Mousemonkey]

i think he did haha!

And you know that, how?

 

[Emperus]

Even a decent quality 650W PSU (which your current unit is sadly not) will be enough to power a GTX 560 SLI rig. Get something like a Corsair TX 650 V2.

 

[vitornob]

Do not try it, can't trust a PSU that doesn't have a label of power distribution of 12v rails.

 

[unksol]

yea... that PSU looks... suspect... to say the least.

 

[pro-gamer]

then does he need a new one?

 

[vitornob]

Yes, he sure needs another one for the sake of his entire system

 

[geekapproved]

Have you actually tried running two GTX560Ti's that way?

Molex connectors have a 75w maximum rating. GTX560ti and above use more than 150w. It's ok to use one if you have a dedicated pci-e connector already attached, but not recommended to use two.

So no, I certainly wouldn't try running a 150w+ card with 2-75w molex connectors.

 

[Mousemonkey]

Molex connectors have a 75w maximum rating. GTX560ti and above use more than 150w. It's ok to use one if you have a dedicated pci-e connector already attached, but not recommended to use two.

So no, I certainly wouldn't try running a 150w+ card with 2-75w molex connectors.

The PCIe slot also provides about 75w, or did you forget about that?

 

[geekapproved]

The PCIe slot also provides about 75w, or did you forget about that?

If it drew 75w from the motherboard, why would a 150w graphics card need 2 PCI-E power connectors? Did you think about that??

Obviously it doesn't draw 75w through the motherboard, but rather directly from the psu, hence the requirement for TWO connectors.

 

[geekapproved]

Have you actually tried running two GTX560Ti's that way?

I think you mis-understood the question. The question was not about running TWO GTX560's with molex connectors, it was about running ONE with 2 pci-e connectors and the other with 2 molex adaptors.

Any person with half a brain would use 1 pci-e connector to each card and 1 molex adaptor to each card, not 2 pci-e to one card and 2 molex to the other. It just makes sense and that is the recommended configuration if you bother to read a AMD or Nvidia manual.

 

[Mousemonkey]

If it drew 75w from the motherboard, why would a 150w graphics card need 2 PCI-E power connectors? Did you think about that??

Obviously it doesn't draw 75w through the motherboard, but rather directly from the psu, hence the requirement for TWO connectors.

The card may also require more than 150w, which is why it requires two PCIe power connectors.

I think you mis-understood the question. The question was not about running TWO GTX560's with molex connectors, it was about running ONE with 2 pci-e connectors and the other with 2 molex adaptors.

Any person with half a brain would use 1 pci-e connector to each card and 1 molex adaptor to each card, not 2 pci-e to one card and 2 molex to the other. It just makes sense and that is the recommended configuration if you bother to read a AMD or Nvidia manual.

The question Zippy, was not what made sense but whether it would be possible.

 

[geekapproved]

So you would tell someone to do something that makes no sense just cause it's possible? Ohhhhkay. Great advice.

Why does it seem the only point of your posts is to argue with someone? You've contributed nothing to the post whatsoever to help the poster with his question.

The psu is generic and doesn't even have a basic certification, no does it list the 12v rails, so telling him to use it at all would not be a good idea, so whether or not he can use his molex adaptors is irrelevent to the point I made in my first post. It also seems the other posters agree with this conclusion.

 

[Mousemonkey]

So you would tell someone to do something that makes no sense just cause it's possible? Ohhhhkay. Great advice.

Why does it seem the only point of your posts is to argue with someone? You've contributed nothing to the post whatsoever to help the poster with his question.

The psu is generic and doesn't even have a basic certification, no does it list the 12v rails, so telling him to use it at all would not be a good idea, so whether or not he can use his molex adaptors is irrelevent to the point I made in my first post. It also seems the other posters agree with this conclusion.

Strange that I think that of you as well, and who is telling anybody to go do something? I advise you to roll your neck in before you get banned again.

 

[geekapproved]

Banned again? I have never been banned thank you.

I'm sorry, is your primary purpose here to argue with everyone that disagree's with you, and them theaten them with banning?

I rarely see you contribute anything useful to anybodies threads other than belittle them. What exactly was your point of posting on THIS thread anyways? The answer is purely to pick an argument with me. An argument about common sense approach to hooking up a video card the correct way, that for some strange reason, you disagree with.....

If giving advice to a poster, the same advice that can be found in ANY AMD or Nvidia manual for any card that comes with a molex connector, is means for banning, then I guess I'm guilty.

Show me a manual that shows 2 molex adaptors hooked to one card and I'll gladly agree with you.

So if you feel you need to ban me, go ahead, I will live without having to be hassled constantly by a disgruntled mod with a terrible attitude.


Have a nice day!

 

[Mousemonkey]

Banned again? I have never been banned thank you.

I'm sorry, is your primary purpose here to argue with everyone that disagree's with you, and them theaten them with banning?

I rarely see you contribute anything useful to anybodies threads other than belittle them. What exactly was your point of posting on THIS thread anyways? The answer is purely to pick an argument with me. An argument about common sense approach to hooking up a video card the correct way, that for some strange reason, you disagree with.....

If giving advice to a poster, the same advice that can be found in ANY AMD or Nvidia manual for any card that comes with a molex connector, is means for banning, then I guess I'm guilty.

Show me a manual that shows 2 molex adaptors hooked to one card and I'll gladly agree with you.

So if you feel you need to ban me, go ahead, I will live without having to be hassled constantly by a disgruntled mod with a terrible attitude.


Have a nice day!

To point out that it is possible to run a card from two molex to six pin adapters despite what you or any manuals say, I at no point said that it was recommended just that it was possible.

 

[geekapproved]

Where did I say it wasn't possible, and how does that relate to the thread?

I said no you can't, because that's not what the manual recommends. The manual says to use 1 molex for each card and 1 pci-e connector. Not 2 on one and 2 on the other.

Whether I've tried it or not is irrellevent.

 

[geekapproved]

Let me point out the posters question to you.

Will my Current PSU be able to handle it?

The answer is no. Period. That psu doesn't even list the available +12v rails.

That was the only question the poster asked.

 

[Mousemonkey]

Where did I say it wasn't possible, and how does that relate to the thread?

I said no you can't, because that's not what the manual recommends. The manual says to use 1 molex for each card and 1 pci-e connector. Not 2 on one and 2 on the other.

Whether I've tried it or not is irrellevent.

Actually it's very relevant, as I have tried it so I know it will work whilst you are saying it can't work because the manual says so. The OP has a 700w PSU and even a fairly mediocre 700w PSU should be able to run SLi'd GTX560's as they use less power than the Ti versions.

 

[Homeboy2]

Banned again? I have never been banned thank you.

I'm sorry, is your primary purpose here to argue with everyone that disagree's with you, and them theaten them with banning?

I rarely see you contribute anything useful to anybodies threads other than belittle them. What exactly was your point of posting on THIS thread anyways? The answer is purely to pick an argument with me. An argument about common sense approach to hooking up a video card the correct way, that for some strange reason, you disagree with.....

If giving advice to a poster, the same advice that can be found in ANY AMD or Nvidia manual for any card that comes with a molex connector, is means for banning, then I guess I'm guilty.

Show me a manual that shows 2 molex adaptors hooked to one card and I'll gladly agree with you.

So if you feel you need to ban me, go ahead, I will live without having to be hassled constantly by a disgruntled mod with a terrible attitude.


Have a nice day!

My Galaxy 460 has an adaptor for plugging two molex's to make a Pci-E, I am running SLI with a 610 watt PC power PSU. Cards are moderately overclocked and ran Furmark for 30 minutes with no problem. One card runs on 4 molex's.

 

[Homeboy2]

I wouldn't use that psu to power ONE GTX560, let a lone TWO. Get yourself a good fire extinguisher and keep it handy if you try that.

And no you cannot use 2 pci-e to molex to power a card. You can use one on each card, but not two on one card.

Sorry, but you're wrong.