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Does My power supply support gtx 770?

Last response: in Graphics & Displays
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January 23, 2014 6:55:26 PM

Motherboard: Asus p8z68-v le
PSU: HEC 850W 80+ Silver Power Supply (HEC-850TS)
Processor: i7 2600k

Here is what the PSU says:

DC OUTPUT: +3.3 V +5V +12V1 +12V2 +12V3 +12V4 -12V -5VSB
MAX A:---------25A---25A---22A----22A-----24A-----24A--0.6A -3.0A
Total Wattage: 850 Watt

Heard that the GTX 770 needs a total of 44Amps to run. According to my PSU it only has a +12V rail with a MAXIMUM amperage of 22A. However, I do have a molex -> PCI-E power converter basically just connect 2 molex power to the converter and at the end of it you get a PCI-E power connector. And for the second PCI-E connector i'll just use the PCI-E connector on my PSU. 22 + 22 = 44A just what I need. However, I don't know if this method will work and I don't even think that the EVGA GTX 770 has 2 PCI-E 2.0 power connectors I think it's just 6 / 8 pin power connector. So do I need to upgrade my PSU to run it? If so, what is a good PSU that I can buy in order to run it? I'd like it to be ATX because those PSU that has a big long pony tail with no additional connectors is really annoying
a b ) Power supply
January 23, 2014 6:57:11 PM

The 770 requires 2 of the 12v rails, so just add the amps together and you get your 44 amp minimum.
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January 23, 2014 6:59:06 PM

woltej1 said:
The 770 requires 2 of the 12v rails, so just add the amps together and you get your 44 amp minimum.


Does the 770 have 2 PCI-E power connectors?
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
that's the one I wanna get. It doesn't say it has 2 but it does say it has a 6 pin and 8 pin. Would I connect both of them?
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a b ) Power supply
January 23, 2014 7:00:09 PM

Yes, it requires 2 6 pin connectors and has 2 female ports for them.
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a b ) Power supply
January 23, 2014 7:01:07 PM

The card will get some power from the PCI-E slot too.
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a b ) Power supply
January 23, 2014 7:01:45 PM

1 6 pin and 1 6+2 pin connector*
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a b ) Power supply
January 23, 2014 7:01:59 PM

A 770 only runs about 240w max (roughly 20a). I'm not a fan of split rail psu's, but in your case what I would do is use a 6pin from one rail and a 6+2pin from a second rail. Run the rest of the hardware from a third rail and you should be good to go.

EDIT: As an aside, the HEC psu's are not highly regarded. Be careful with what you run on it. A general rule of thumb I use is to pay a minimum of $1 - $1.25 per 10 watts. For instance, a good 500w unit should cost 500/10=50 x $1 ($1.25) = $50 - $62.50. For an 850w psu, I would expect to spend at least $100.

Mark
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January 23, 2014 7:02:43 PM

Package Contents:
1 x 6-pin PCI-E Power Adapter
1 x 8-pin PCI-E Power Adapter
So here is how I am planning on doing this correct me if I'm wrong.
I'll insert the graphics card obviously to the PCI Express 2.0 slot on my MB. Then I will connect 1 PCI Express power connector (containing 22 AMPS) then I will use that 8 pin connector and on the other side will be a splitter type thing. Where it will have 2 Sata Connectors -> PCi E power or 2 Molex -> PCI-E power connector. That's what i'm assuming. Because I have no 2 pin conntector on my PSU. So I'll be using that 8 PIN PCI-E power adapter it comes with right? And the 6 pin is probably just the standard PCI-E power which I already have
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a b ) Power supply
January 23, 2014 7:14:14 PM

Psu's of that size should have 6+2 connectors. If it only has 6 pins, stay away from it. See my edit above.

Mark
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a b ) Power supply
January 23, 2014 7:15:12 PM

Priva said:
Package Contents:
1 x 6-pin PCI-E Power Adapter
1 x 8-pin PCI-E Power Adapter
So here is how I am planning on doing this correct me if I'm wrong.
I'll insert the graphics card obviously to the PCI Express 2.0 slot on my MB. Then I will connect 1 PCI Express power connector (containing 22 AMPS) then I will use that 8 pin connector and on the other side will be a splitter type thing. Where it will have 2 Sata Connectors -> PCi E power or 2 Molex -> PCI-E power connector. That's what i'm assuming. Because I have no 2 pin conntector on my PSU. So I'll be using that 8 PIN PCI-E power adapter right?


Just leave the two pin leftover dangle next to the gpu.
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January 23, 2014 7:30:36 PM

markwp said:
Priva said:
Package Contents:
1 x 6-pin PCI-E Power Adapter
1 x 8-pin PCI-E Power Adapter
So here is how I am planning on doing this correct me if I'm wrong.
I'll insert the graphics card obviously to the PCI Express 2.0 slot on my MB. Then I will connect 1 PCI Express power connector (containing 22 AMPS) then I will use that 8 pin connector and on the other side will be a splitter type thing. Where it will have 2 Sata Connectors -> PCi E power or 2 Molex -> PCI-E power connector. That's what i'm assuming. Because I have no 2 pin conntector on my PSU. So I'll be using that 8 PIN PCI-E power adapter right?


Just leave the two pin leftover dangle next to the gpu.


Oh, I see. I DO have the +2 pin (I think... photo is below) this is what I have. I have 2 cables just like this. Should I connect them both one without the +2 pin and another one with the +2 pin?
http://imgur.com/hgKL4ky here you can see a photo of the PCI-E power cables. I have 2 of those cables you see in my hand because i'm in crossfire right now. I wonder if I should just use the both of those for power but are those on the same rails? Not sure.

Edit: Also, I didn't know I had the +2 Pin until I looked. I'll leave it dangle like you said. If it doesn't work with it dangled, i'll use it. Why do they have that +2 pin anyway?
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a b ) Power supply
January 23, 2014 8:06:36 PM

Some cards need 6 pins and some need 8 pins. The 6+2 combination can be used with both. Pretty smart idea, isn't it...
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