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[Official] NVIDIA GTX 780 Ti Owner's Club - Page 930

post #9291 of 16482
Classified is 8+8 pin. and no. Where do you get your information from? The Classified PCB is not minor tweaked. If you put 1.4v through a reference PCB, there's probably an 80% chance you wouldn't even get through Valley benchmark before it popped. Classified can take that voltage without a problem.

However, don't believe what NV are saying about power usage on these things. Once you add voltage, they literally go through the roof. Makes the 290X @ 1.55V seem power friendly indeed!
post #9292 of 16482
Quote:
Originally Posted by gordan View Post

Rail overload from running 8+6 pin off a single rail, maybe? Classifieds are only a minor tweak on the reference design, I wouldn't expect them to be drawing that much more power, at least not compared to a reference card with a tweaked BIOS.

I just got a 1300W G2 purely on the basis of the 10 year warranty (and I thought the 5 year warranty on CoolerMaster PSUs was exceptional). It's still in the box, though, will see how it goes when I build the backup SR-2 rig.

Umm what? The Classifieds are very different from the reference design and can draw a lot more power safely too due to the better components and power delivery. They also have an 8+8 pin power input (8+8+6 in the case of the Kingpin edition).
post #9293 of 16482
NV reference PCBs hate big volts. Seen a few Titans go with as little as 1.3v
post #9294 of 16482
Does anyone besides me use a daisychain setup when running more than 2 of these beasts?.

I understand the newer AX1200i has more pci e than the AX1200, but still not enough for 4 cards even if it had enough power. Maybe not even 3 with 3 plugs per card.


FF
smile.gif
Edited by fishingfanatic - 3/27/14 at 10:14am
post #9295 of 16482
Quote:
Originally Posted by 7Mine7 View Post

.
.


what a coincidence !

i was asking the same question yesterday about the using one pci-e cable with 2 pci-e connectors on it to power my Ti because i'm planning on sleeving my Seasonic X-850 ( which is the exact same as CM V850 ) as i understand

http://www.overclock.net/t/1262900/frequently-asked-sleeving-questions/800#post_22011923


but i'm planning to getting rid of the additional contactor for better sleeving look



Thanks everyone for your info !

should we also look at the size of the individual wire on the PCI-E cable provided with the PSU? I used 2 cables per card on my build just to avoid melting anything under load. I felt the EGVA Supernova 1300G2 wires where on the thin side.

I guess it would depend on how hard one overclock the card.
    
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post #9296 of 16482
Quote:
Originally Posted by shilka View Post

Which one of them NEX or G2?

The NEX
post #9297 of 16482
Quote:
Originally Posted by Silent Scone View Post

Classified is 8+8 pin. and no. Where do you get your information from? The Classified PCB is not minor tweaked. If you put 1.4v through a reference PCB, there's probably an 80% chance you wouldn't even get through Valley benchmark before it popped. Classified can take that voltage without a problem.

I am not sure what the point is of pushing that kind of voltage - you get into diminishing returns, and on air you get limited by temperatures even with the fan cranked up as high as it will go (5200 rpm - very noisy) at 1.2V. On water you'll get a little further, but as I said - diminishing returns.
Quote:
Originally Posted by Silent Scone View Post

However, don't believe what NV are saying about power usage on these things. Once you add voltage, they literally go through the roof. Makes the 290X @ 1.55V seem power friendly indeed!

I take all specs with a bucket of salt. Physics, OTOH, are somewhat more trustworthy. The power dissipation of a circuit is defined as:

P = C * clk * V^2

where:
P = power/heat
C = capacitance of the circuit
clk = clock speed
V = voltage

So for C and clk being constant, going from V=1.2 to V=1.4 the P increase would be according to the ratio of 1.2^2 : 1.4^2 = 1.44 : 1.96 ~ 136%.

Sure - that's a lot. Then again, I'm running my Titan at 140% TDP a little below the 95C limit with the fan going full tilt at 5200rpm, and that doesn't get past 1.135V.

Given stock TDP is 250W, and I'm pushing 140%, that is 350W@1.135V
1.135^2 : 1.4^2 = 1.289 : 1.96 ~ 152% of 350W
which is about 533W.

It gets silly. And that doesn't take into account an extra clock speed you might get out of it which might push it up by another 10%. Even if the card came with 2x8 + 1x6 aux power (IIRC the reference PCB has positions for that many), that is still 450W max - still only about 2/3 of what you'll need. Going that far out of spec you're going to pop something even if the card doesn't go first.
post #9298 of 16482
Quote:
Originally Posted by NvidiaFan29 View Post

The NEX

Made this thread yesterday did not think i would need it that fast

http://www.overclock.net/t/1476935/why-you-should-not-buy-an-evga-supernova-nex650g-750g

Go for the EVGA SuperNova G2 instead its much better
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post #9299 of 16482
Quote:
Originally Posted by shilka View Post

Made this thread yesterday did not think i would need it that fast

http://www.overclock.net/t/1476935/why-you-should-not-buy-an-evga-supernova-nex650g-750g

Go for the EVGA SuperNova G2 instead its much better

I already have the NEX powering my system. So what you're saying is I should get another one for the 780 ti classified? Any other suggestions other than G2? Thank you for the help.
post #9300 of 16482
Quote:
Originally Posted by NvidiaFan29 View Post

I already have the NEX powering my system. So what you're saying is I should get another one for the 780 ti classified? Any other suggestions other than G2? Thank you for the help.

If you read that thread you can see the problem, Just read it all and dont take things out of context
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