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MSI GTX780 Lightning due 07/08/13

pgi947 said:
I'm not saying I'd recommend it, but surely a good loop ran from cold would just handle 1.5v for a few mins of benching?

I didn't think gk110 ran all that hot?
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They run very hot!!! They eat LN2 even more than a 480 or 580 did!!!
 
whyscotty said:
Sorry mate, if the chip fails board partners send them back to Nvidia.

This is what came to light last year when Nvidia first started clamping down on voltage control.


I'm presuming now that on the 7xx series that Evga and MSI are taking the hit if the chip fails on their custom boards (my thoughts no proof)
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If they overclock the chips at all or change the board designs a partner can not return the GPU to Nvidia. The partner in its entirety takes the hit for RMA. So my point still stands if they want to let partners make OC Board of flagship products e.g Titans.
 
3t3P said:
is this a typo that cards are drawing 260-300amps?!

because that, seems, impossible
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They can draw about 65 amps at 1.55 VGPU. that is a dam lot. In Taiwan we could not power one modded titan with a 800 watt PSU!!! We needed 1500w PSU per card.
 
3t3P said:
is this a typo that cards are drawing 260-300amps?!

because that, seems, impossible
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whyscotty said:
watts not amps
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No My friends that's Amps (coulombs per second)...about the same as your car starter motor takes and all going through a little square of silicon :eek:

TBH, very surprised people have not given things like this much thought ;)

The only seemingly Impossible, is control the heat at those microscopic junctions and they will take it.. Heat is electronics no1 enemy.
 
Wouldn't you calculate a cards amp/watts from the +12v at input, not the core voltage? Which would be why a 65a draw on a titan couldn't be powered by a single 800w psu...12x65=780w?
 
Haha try having a split rail hx1000 :(

Only takes something like 40a per rail, wouldn't even let me clock my 7970's right up!!
 
Jakus said:
No My friends that's Amps (coulombs per second)...about the same as your car starter motor takes and all going through a little square of silicon :eek:

TBH, very surprised people have not given things like this much thought ;)

The only seemingly Impossible, is control the heat at those microscopic junctions and they will take it.. Heat is electronics no1 enemy.
Click to expand...


I think your confusing yourself using coulombs law.


1200w supply - using 12v rail = max 100amp +/-

It's a while since I've done these sort of calcs

But if memory serves watts/power = coulomb/charge

As I said it's been a while :)
 
pgi947 said:
Wouldn't you calculate a cards amp/watts from the +12v at input, not the core voltage? Which would be why a 65a draw on a titan couldn't be powered by a single 800w psu...12x65=780w?
Click to expand...

Yes and the only significant thing taking power on that card (the gpu core) is being fed, say 1.5volts so its 780w / 1.5 = 520Amps
 
whyscotty said:
I think your confusing yourself using coulombs law.


1200w supply - using 12v rail = max 100amp +/-

It's a while since I've done these sort of calcs

But if memory serves watts/power = coulomb/charge

As I said it's been a while :)
Click to expand...

:) No its simple Ohms law, a coulomb is a measurement of electrons and 1 coulomb flowing in 1 second is 1 Ampere.

I just mentioned Coulomb as I recall it defining amps....must look on google one day when I'm really bored :D
 
Posted today

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