It doesn't require much power at all:

http://www.guru3d.com/article/asus-geforce-gtx-670-directcu-ii-top-review/8

Their test system pulled 293W from the wall outlet with the 670 TOP under full load. If I add 200W to this "at the wall" power draw to assume that the entire system is maxed out simultaneously (including the CPU), then that ends up being 493W being pulled from the wall outlet. However, the amount of power that the system would be pulling from the PSU would be lower than that because no PSU is 100% efficient. So, if the PSU is 85% efficient, then that would result in about 420W being pulled from the PSU if both the GTX 670 and the CPU were overclocked and maxed out completely.

 

Quote:

Originally Posted by TwoCables

It doesn't require much power at all:

http://www.guru3d.com/article/asus-geforce-gtx-670-directcu-ii-top-review/8

Their test system pulled 293W from the wall outlet with the 670 TOP under full load. If I add 200W to this "at the wall" power draw to assume that the entire system is maxed out simultaneously (including the CPU), then that ends up being 493W being pulled from the wall outlet. However, the amount of power that the system would be pulling from the PSU would be lower than that because no PSU is 100% efficient. So, if the PSU is 85% efficient, then that would result in about 420W being pulled from the PSU if both the GTX 670 and the CPU were overclocked and maxed out completely.

Thank you for responding, my CPU isnt overclocked at all and my PSU is a 500W and have a 80+ Silver certification.
Nothing in my pc is overclocked and wont be yet. so will 500W do it. some say yes and others says no so im a little confused.

 

I believe the official power rating is 150w at stock clocks... so 12v@12.5A.

 

Well, the system they have pulls ~300watt on a full GPU load alone, if you check their full system, the CPU (i7 965) alone will pull another 130watt at most under load. So all in all they should end within the 500watt limit you have with a CPU that will draw more power.

As far as my calculations go, you should be able to run it, even with a CPU overclock (nothing too extreme, maybe 4.2Ghz or something). Provided your PSU can deliver the amps of course.

 

Quote:

Originally Posted by ProXioN

Thank you for responding, my CPU isnt overclocked at all and my PSU is a 500W and have a 80+ Silver certification.
Nothing in my pc is overclocked and wont be yet. so will 500W do it. some say yes and others says no so im a little confused.

Well, I think the best way I can answer is by saying that I'll be surprised if it's not enough because their system is more power-hungry than yours.

I mean, their test system pulled 293W from the wall outlet, and then I added 200W to that which is actually very unrealistic. Then I multiplied that by .85 in order to see what the system would be pulling from the PSU, and it ended up being about 420W. If I only added 100W to the power draw and then multiplied that by .85, then it would make for 335W being pulled from the PSU if both the 670 and the CPU are maxed out simultaneously.

So yeah, it should be more than enough.

 

That sounds great! Thanks for your time, all of you.
That really helped me alot.

 

Quote:

Originally Posted by MasterFire

Well, the system they have pulls ~300watt on a full GPU load alone, if you check their full system, the CPU (i7 965) alone will pull another 130watt at most under load. So all in all they should end within the 500watt limit you have with a CPU that will draw more power.
As far as my calculations go, you should be able to run it, even with a CPU overclock (nothing too extreme, maybe 4.2Ghz or something). Provided your PSU can deliver the amps of course.

So would 36 amps do it?

 

Quote:

Originally Posted by ProXioN

So would 36 amps do it?

36A is 432W, so it should be more than enough, especially based on what I discovered above from that professional review of the 670 TOP.

 

Great, thanks again.

 

You're welcome!

 

I a very similar set up to you with a 520W bronze PSU and it works fine. -You "should" be fine and looking at the previous posts my input is just to re-assure you.

 

The efficiency rating only refers to how much power it's pulling from the wall. So, it's not referring to the PSU's capacity (that is, it's not referring to how much power it can deliver to the system).

So in other words, let's say a system pulls 350W from the PSU, and let's say the PSU is 80% efficient. This would make the PSU pull about 438W from the wall. If the PSU is 85% efficient, then the 350W power draw would make the PSU pull about 412W from the wall outlet. If the PSU were 90%, then it would make the PSU pull about 389W from the wall outlet.

So, if the PSU were 100% efficient (hey, that should be possible some day), then it would pull 350W from the wall outlet.

The PSU's capacity is how much power it can deliver to the system, not how much it can pull from the wall outlet.

 

Quote:

Originally Posted by TwoCables

So, if the PSU were 100% efficient (hey, that should be possible some day), then it would pull 350W from the wall outlet.

That is impossible.... it requires some work/energy for conversion.

 

Quote:

Originally Posted by DuckieHo

That is impossible.... it requires some work/energy for conversion.

Yeah, right now it does. I see a time in our future (in our lifetime) where 100% efficient PSUs are commonplace due to using a very different and very advanced technology. A day is coming relatively soon where many things that are impossible today will become easily possible.

 

Two Cables (and of course our OP). GPU amperage draw (and techniques to actually measure it) is something that interests me. One of the major jobs my test station that is under construction will do is measuring gpu amperage draw. I will have a meter on each of the 6 pin (or 6+2 pin) cables but my question concerns the power comming through the motherboard to the card.I know that an upper limit can be set on power to a gpu through the motherboard but I do not know if some parameter like, if at all times the max allowed by BIOS setting will flow through the motherboard connection or if there is a situation when this connection is basically not used and almost everything flows through external card cabling.I want to see both, how close my reading is when compared to a manufactures stated requirement and how close you can get to a rails ("rails" as in the power supply) rating before and issue pops up.Finally,I just prefer working in amps rather than watts when figuring out how much I am stressing things.

 

A PSU with 100% efficiency. That would be great. But as it looks like now it feels like a far away dream.
Quote:

Originally Posted by TwoCables

A day is coming relatively soon where many things that are impossible today will become easily possible.

I will look forward to that then.

 

Quote:

Originally Posted by TwoCables

Yeah, right now it does. I see a time in our future (in our lifetime) where 100% efficient PSUs are commonplace due to using a very different and very advanced technology. A day is coming relatively soon where many things that are impossible today will become easily possible.

The second law of thermodynamics is still a very fundamental law, it would really be incredible if a 100% efficient PSU is ever gonna be possible.

 

I have no idea. I don't need to be absolutely 100% precise, so measuring my power draw at the wall outlet and then multiplying by about .85 for 85% efficiency and then going from there is good enough for me.

 

Quote:

Originally Posted by Sisaroth

The second law of thermodynamics is still a very fundamental law, it would really be incredible if a 100% efficient PSU is ever gonna be possible.

I know that it's still a very fundamental law. That's just our current understanding of how we think things work.

 

Quote:

Originally Posted by TwoCables

I know that it's still a very fundamental law. That's just our current understanding of how we think things work.

No, it's impossible since it requires work. If free or 100% efficent work was avaliable, then it would mean then a perpetual motion machine would be possible.

 

Quote:

Originally Posted by DuckieHo

No, it's impossible since it requires work. If free or 100% efficent work was avaliable, then it would mean then a perpetual motion machine would be possible.

That just seems like a dream to me. If that was possible. Then we would have no need for power at all.

 

Time will tell. I will leave it at that.

I apologize for bringing it up.

 

You could not be more true. Only time will tell us.

 

ok ok, can I back track please. is my 520W pulling more from the wall then but not passing more to the system due to it's efficiency? Cool that makes sense, cheers

 

dhug, think of your system usage being less than what is reported at the wall as a reflection upon your power supply being less than 100% efficient.The wall figure is what you pay for, but total system need is calculated with the loss from the operation of the power supply ignored.I am waiting for the 105% efficient power supplies developed with the aid from technology discovered at Roswell.