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[Official] NVIDIA GTX 780 Ti Owner's Club - Page 781

post #7801 of 16504
After some doubts were expressed about the PCIe power connectors and the true wattage that can be drawn here is my take on it!

The PCI-E connecter has 6 pins. They are not all used for power. For the 6 pin connector, Pins 1 & 3 are 12V & each can carry 8 Amps. Pin 2 by spec is not connected (but i´ve never seen a PCIe cable with Pin 2 not connected... rolleyes.gif )
Pins 4 & 6 are Com return lines. Pin5 is Com for sensing. Using 2 lines, you get 12V*8A*2= 192Watts, much over the required 75Watts. With an 8 pin PCI-E connector, 2 Com lines are added (4&8) not a 12V & Com. There, Pins 1,2,3 are 12V, Pin 4 is a Com for the 8 pin connector sensing, Pin 5,7,8 are Com return lines, & pin 6 is for the 6 pin connector sensing. Using that config, 12V*8Amp*3=288 Watts, much over the required 150Watts.
There aren't 4 12V pins on the 8 pin connector, only 3, and 2 leads are used for sensing the connector type.

Default specs for PCIe specification 6-pin:




Default specs for PCIe specification 8-pin or 6+2:





BUT, (there is always a but right?tongue.gif )The 12V, 5V, & 3.3V leads are spec'd at #18 gauge, which can carry a max of 10/11 Amps per #18 wire!

So that gives us:

P(W) = I(A) × V(V)
6 Pin: 12V*10A*2= 240 W (But there is 3 12V lines) = 360W
8 Pin: 12V*10A*3= 360 W

MAX theoretical wattage supplied by PCIe lines = 720W


Plus the 75W (again default specs) from the PCIe slot in the motherboard you have a healthy 795W+ for your beast power hungry GK110 card! thumb.gif


Cheers all

Ed

(Team skyn3t)
Edited by OccamRazor - 2/20/14 at 5:05pm
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post #7802 of 16504
Is there anything dodgy about the 780 Ti Superclocked card from EVGA? I ordered the stock version but the retailer sent me an SC card with "free upgrade to SC" written on the invoice. Of course, instead of thinking "cool! free upgrade!" like a normal person, I set about trying to find the catch. The only weird thing I can see is that 99% of retailers in my country, including my retailer, have now withdrawn their listings for the SC 780 Ti (although the ACX version is still available). I thought the card might have been recalled or something, but it seems like it's still being sold in the US etc.
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post #7803 of 16504
The SC is just factory overclocked, nothing else different.
post #7804 of 16504
Quote:
Originally Posted by Oubadah View Post

Is there anything dodgy about the 780 Ti Superclocked card from EVGA? I ordered the stock version but the retailer sent me an SC card with "free upgrade to SC" written on the invoice. Of course, instead of thinking "cool! free upgrade!" like a normal person, I set about trying to find the catch. The only weird thing I can see is that 99% of retailers in my country, including my retailer, have now withdrawn their listings for the SC 780 Ti (although the ACX version is still available). I thought the card might have been recalled or something, but it seems like it's still being sold in the US etc.

Im not exactly sure if its dodgy or not, but i would say Unlock the Bios with Skynets bios and overclock her, if she overclocks well you have nothing to worry about tongue.gif there are standard reference cards clocking well above some of the non reference designs allover the place, its all about the silicon lottery.
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post #7805 of 16504
It. Is. So. Tempting. To. Overclock. drool.gif New case = 63C after 5 loops of valley... On Air.
Edited by 50shadesofray - 2/20/14 at 7:10pm
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post #7806 of 16504
I got my 2 Tis in yesterday and ordered the rest of my compy parts today. I'm ready to unleash these beasts.
post #7807 of 16504
Quote:
Originally Posted by WoOkiE FTW View Post

I got my 2 Tis in yesterday and ordered the rest of my compy parts today. I'm ready to unleash these beasts.

*waves magical silicon lottery wand* hope they are good ones!
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post #7808 of 16504
Damned coil whine is back with this card. I had an amazing run with two silent GTX 580s and 3 silent 780s, but I knew it was only a matter of time. At least its moderate - it's a far cry from the wretched squealing I got from the 8800 and 200 series.
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post #7809 of 16504
hi guys, i've purchased a GTX780ti MSI gaming wich is nice, quite and everything but i found something weird..In most of the reviews i've seen the bios is 80.80.30.00.30 with stock clock at 1020. Mine is 80.80.34.00.0F, with stock clock at 980. I know that i've the game app, to set the oc mode but i find very strange that msi didn't explain well this situation, because i never seen a review with my bios settings. I downloaded the 1020 clock bios, should have i to flash it?
post #7810 of 16504
Quote:
Originally Posted by Iceman1985 View Post

Now guys, i received my EVGA 780Ti SC (reference cooler) today. I'm sending the Asus one back to the store..

I realized the second i opened my box that the card is used, the seal is broken!

After i installed the card and new drivers i thought.. this can no way in hell have "worse" ASIC than my Asus card that had 67%. Well, it turns out this card is @ 64%.

So i began benchmarking and overclocking.. realizing that this card actually does quite well.. according to EVGA P.X. i'm running stable through Firestrike, Heaven and Valley @ 1290Mhz Core, sometimes it's down to 1250Mhz due to power limit i guess (it's @ 106% now and then)

Conclusion: This could not have gone any better.. this card runs cooler and quiter than both the Ti ACX and Ti DC2 (in my Prodigy case) it maxes out @ 70 degrees celsius.


So the tests were made with my 4770K @ 4,4ghz.
Points: 3dmark Firestrike: ~12k points.
Heaven: ~2300 points.
Valley: 3246 points.

What do you think of these results? Now i'm really considering Skyn3t's bios for further overclocking smile.gif


hi mate

first of all congrats for your new card.

i have some questions;

1-didnt the card's being used by someone else bother you?

2-do you have any rattling fan noise or buzzing sound from the card?

3-what was hyour base clock 980mhz?

thanks in advance
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