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Corsair AX860 for 4770K and GTX 780 Ti SLI - Page 11

post #101 of 118
Quote:
Originally Posted by JoHnYBLaZe View Post

Thanks exxon.....But I'm talking about SLi overclocked though. I know it doesn't exactly double but wouldn't it be very close with only 71 amps for two 42 amp cards. Just to update you, I'm asking because I've shutdown 3 Ax 860's with 780ti sli and I want to know what went wrong

What clocks/volts ?

With stock Bios on regular 780Tis, you can't go past 106% power limit which is locked by Nvidia.
100% Power limit with stock Bios is 250W, 106% is 265W. Once you hit the PL, clocks And volts will scale down accordingly to maintain a PL below 106%.
What I'm saying is, stock 780Tis in SLI should not shut down a quality 860w unit.
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post #102 of 118
Quote:
Originally Posted by eXXon View Post

What clocks/volts ?

With stock Bios on regular 780Tis, you can't go past 106% power limit which is locked by Nvidia.
100% Power limit with stock Bios is 250W, 106% is 265W. Once you hit the PL, clocks And volts will scale down accordingly to maintain a PL below 106%.
What I'm saying is, stock 780Tis in SLI should not shut down a quality 860w unit.

1200+ mhz 1.212 volts 106% everything max power/usage

600 max wattage consumed determined by a kill-a-watt and corsair link (I know not totally accurate but both seem to agree)

AX1200i swapped in, no more shutdown

any idea what the amperage would be like for 2 780 ti's?
post #103 of 118
Quote:
Originally Posted by JoHnYBLaZe View Post

1200+ mhz 1.212 volts 106% everything max power/usage

600 max wattage consumed determined by a kill-a-watt and corsair link (I know not totally accurate but both seem to agree)

AX1200i swapped in, no more shutdown

any idea what the amperage would be like for 2 780 ti's?

By the readings you got, clocks/volts and my guess, around 48-58 Amps for both.
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post #104 of 118
Quote:
Originally Posted by eXXon View Post

By the readings you got, clocks/volts and my guess, around 48-58 Amps for both.

I've been thinking that a wire had to have been the issue, seeing that I've swapped out the unit 3 times

AX 860 are supposed to be quality platinum supplies, and the first unit I had, never had an issue until OC'ed load

Everything I know and everyone tells me, an 860 should be perfect and yet....axesmiley.png
post #105 of 118

No, 42A on 12V power is 504W, not 480.

 

Anyway, that 42A is for the entire system.

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post #106 of 118
Quote:
Originally Posted by TwoCables View Post

No, 42A on 12V power is 504W, not 480.

Anyway, that 42A is for the entire system.

Confusing....What I'm trying to figure out is if 780ti sli would exceed 71 amps on the 12v rail which is what the 860's max is
post #107 of 118
Quote:
Originally Posted by JoHnYBLaZe View Post




Confusing....What I'm trying to figure out is if 780ti sli would exceed 71 amps on the 12v rail which is what the 860's max is

 

What's confusing about it? They are saying that in order to power an entire computer that has one GTX 780 Ti in it, they recommend that the PSU's +12V output capacity be at least 42A. That's 504W. It's not just for the video card. It's for the entire system. I mean, my god, there's no way that one video card is going to need 42A (on 12V power) all to itself. Again, that's 504W!

 

As I said before, the AX860 is way more than enough for powering a system that has two 780 Ti's in it. As I said, 603W. Remember? You found 600W. Not far off. A difference of only 3W.

 

So, unless you're using a custom BIOS for these video cards in order to crank the voltage through the roof, I don't see how the AX860 would be insufficient.

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post #108 of 118
Quote:
Originally Posted by TwoCables View Post

What's confusing about it? They are saying that in order to power an entire computer that has one GTX 780 Ti in it, they recommend that the PSU's +12V output capacity be at least 42A. That's 504W. It's not just for the video card. It's for the entire system. I mean, my god, there's no way that one video card is going to need 42A (on 12V power) all to itself. Again, that's 504W!

As I said before, the AX860 is way more than enough for powering a system that has two 780 Ti's in it. As I said, 603W. Remember? You found 600W. Not far off. A difference of only 3W.

So, unless you're using a custom BIOS for these video cards in order to crank the voltage through the roof, I don't see how the AX860 would be insufficient.

Confusing that I can't figure out how many amps 780ti sli would pull stock or could pull given max STOCK voltage and O.C.

Confusing that 3 860 which were all new, 2 of which were brand new would shutdown under the same load
post #109 of 118
Quote:
Originally Posted by JoHnYBLaZe View Post


Confusing that I can't figure out how many amps 780ti sli would pull stock or could pull given max STOCK voltage and O.C.

Confusing that 3 860 which were all new, 2 of which were brand new would shutdown under the same load

 

Your computer pulled 600W from the PSU, right? That's why I said that maybe it has something to do with the power delivery in your home. I mean, really: 260W of headroom on a high-end PSU that is designed to easily deliver 860W 24/7 should seriously be a walk in the park. I would understand shutdowns if your power consumption were like 900W or more or something, but damn: 600W? Something else is going on here, and that's why I think that maybe (but not definitely, because I'm just guessing) it has something to do with the power delivery in your home.

 

Is there a chance that you could do some testing somewhere else, like at a friend's place or something?

 

Anyway, here's a review where they tested the power consumption of their system with just one 780 Ti and then again with two:

 

http://www.guru3d.com/articles_pages/gtx_780_ti_sli_geforce_review,4.html

 

If their findings are correct that the two 780 Ti's together pulled 508W alone, then that would mean the two cards pulled 42.33A (which is just a coincidental number here, so don't read anything into it). One 780 Ti was found to pull 262W all by itself, and on 12V power that's 21.83A which is almost precisely half of the 42.33A (21.83 x 2 is 42.66).

 

So, even overclocking and maxing out the stock voltage should have no chance of saturating a PSU like the AX860. So, if the AX860 is shutting down, then there's something else going on here, something that might be beyond your control. I don't know.

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post #110 of 118
Quote:
Originally Posted by TwoCables View Post

Your computer pulled 600W from the PSU, right? That's why I said that maybe it has something to do with the power delivery in your home. I mean, really: 260W of headroom on a high-end PSU that is designed to easily deliver 860W 24/7 should seriously be a walk in the park. I would understand shutdowns if your power consumption were like 900W or more or something, but damn: 600W? Something else is going on here, and that's why I think that maybe (but not definitely, because I'm just guessing) it has something to do with the power delivery in your home.

Is there a chance that you could do some testing somewhere else, like at a friend's place or something?

Anyway, here's a review where they tested the power consumption of their system with just one 780 Ti and then again with two:

http://www.guru3d.com/articles_pages/gtx_780_ti_sli_geforce_review,4.html

If their findings are correct that the two 780 Ti's together pulled 508W alone, then that would mean the two cards pulled 42.33A (which is just a coincidental number here, so don't read anything into it). One 780 Ti was found to pull 262W all by itself, and on 12V power that's 21.83A which is almost precisely half of the 42.33A (21.83 x 2 is 42.66).

So, even overclocking and maxing out the stock voltage should have no chance of saturating a PSU like the AX860. So, if the AX860 is shutting down, then there's something else going on here, something that might be beyond your control. I don't know.

O.K. I got you now, wattage consumed is related to amperage so I definitely could not be exceeding 71 amps cause that would also mean I was pulling 860 watts or more.

Wouldn't the power delivery/outlet also affect the AX1200i if that was the case?

I'm gonna RMA the 860 for a new unit, each time I tried a new 860 it was only the power supply itself I swapped with the same wires
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