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Benchmarked GTX Titan and GTX 780

It is fairly likely that MacVidCards has modified the firmware to keep the power consumption within the 2x6-pin restriction. You could always just ask him how the power management is configured.
 
DanielCoffey said:
It is fairly likely that MacVidCards has modified the firmware to keep the power consumption within the 2x6-pin restriction. You could always just ask him how the power management is configured.
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The only way to do that is to underclock... I believe he still suggests using an external PSU, regardless of if the cards are configured to use dual 6 pin plugs.

Edit: I believe he's still in time-out. Him and Tesselator, as I understand it, got in an epic rap battle that got out of hand. The body count was staggering.

iN4BBmu.jpg
 
slughead said:
that's a little scary ... A lot of people are going to use the on-board mobo ports.
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The 780GTX uses about the same power as a 570GTX. I'm running it off motherboard power with no issues. The GPUs are -not- underclocked. Only the Titan needs external power. I imagine if you overclocked the 780GTX, it would as well, but at stock speeds with turbo boost 2.0 locked at 80C, it's fine.
 
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gsloan said:
The 780GTX uses about the same power as a 570GTX. I'm running it off motherboard power with no issues. The GPUs are -not- underclocked. Only the Titan needs external power. I imagine if you overclocked the 780GTX, it would as well, but at stock speeds with turbo boost 2.0 locked at 80C, it's fine.
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I thought we had this debate before :)

We assume 75 off the mobo and 75W per plug, for a total of 225 watts. The TPD of this card is 231.

It's probably fine, but over time you could be slowly burning up your tracers, until they finally sever.

MacVidCards is the expert, I'll defer to him.
 
slughead said:
I thought we had this debate before :)

We assume 75 off the mobo and 75W per plug, for a total of 225 watts. The TPD of this card is 231.

It's probably fine, but over time you could be slowly burning up your tracers, until they finally sever.

MacVidCards is the expert, I'll defer to him.
Click to expand...

My information is from MacVidCards.
MacVidCards said:
I am going to start the thread with a comparison of GTX780 with GTX570 2.5GB. The GTX570 is a well loved card that many use in their MP. I do not know of ANYONE reporting power issues with them, whether EFI flashed or running using the self0 initing drivers. I ran a bunch of recent Nvidia cards through the After Effects benchmark on this board and found that the GTX570 is equal to the new GTX680 for that test.

I also decided to use that render as one of my test points for power draw.

GTX570 AE render 161 Watts
GTX570 Furmark 250 Watts
GTX780 AE render 169 Watts
GTX780 Furmark 230 Watts
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*EDIT*

The main concern seems to be amount of wattage over a 75w power cable/traces. 96w-110w seems to be okay, but there are no real guarantees. The 780 does pull more juice off of one of its power sockets, but there's no data to say whether it's too much or not other than it's "more than."

But in a post from last year, MacVidCards said..

MacVidCards said:
There is no reason to believe that Apple DESIGNED in the ability to handle 150 watts into each of those 6 pin connectors and their traces that lead back to the PSU. Yes, it may work for awhile, but it is not solid thinking to expect it to keep working into the future.

Either buy a card with Dual 6 pin plugs, or get an external PSU. GPU manufacturers don't put 8 pin plugs on cards just to look cool. They do it because the card draws more current than a 6 pin can reliably transmit over the long term.
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Granted the extra 8-pin power connector is surely useful/necessary for overclocking, which all of these cards are capable of from the factory, maybe it's not ultimately necessary for a stock-clocked 780GTX? Dave was pretty adamant about not wanting to OC the 780 as it was "fast enough", and that the limit lay somewhere in-between the GTX 780 and the Titan.

Dave can speak for himself eventually, since he's modding the second 8-pin connector on the card to work with a 6-pin connector via solder. For now, I'm just enjoying my card, and I've not had it blink off or behave strangely at all.

Ultimately, time will tell. :)
 
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Hey, I'm typing this from iPhone as I walk to gym so I'll have to post link later.

But Barefeats has done a follow up comparison with iMac with its Gtx780m to the REAL 780.

Quite a smack down, new 780m is underwhelming.

Older Pro still king vs newest iMac

http://barefeats.com/haswel1.html
 
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jav6454 said:
The HD7950 is not the competition to the GTX 780, the HD7970 is. HD7950 competes against the GTX 770.

Also, the Titan competes against the HD7990 or HD7970 GHz Edition.
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Hey, the 7950 runs like a champ on Windows. Might be different for OS X however.
 
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