The following chart was taken from www.maximumpc.com. It shows that the GTX 780 TDP is 250W which is the same as the Titan's TDP. Therefore, if a Titan requires an auxiliary power supply, why shouldn't the GTX 780?
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- Thread starter TheHerdForever
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Forget the totals for a minute. The fact that the sum of draws (230W) is close to the sum of sources (225W) does not mean it is safe.
That post you linked to actually identifies the problem. Look at the last picture:
The Mac Pro provides:
PCIe Slot: 75W
6-pin connector: 75W
6-pin connector: 75W
The last screen shot from that post shows:
63.6W
56.3W
110.6W
The first two are fine. The third, presumably the 8-pin connector on the video card, is over spec by a whopping 47%. Someone please correct me if I'm wrong, but to me it looks like an awful lot is being asked of that third source.
This post lists total power draw. It does not describe where the cards are pulling the power from. It also says running this Furmark benchmark causes Mac Pro 3,1s to shut down.
My interpretation of this post is that, at least in Mac Pro 3,1s, the GTX 780 is running along the edge of the cliff of acceptability.
The GTX570 (Furmark) caused the 3,1 to shut, the GTX780 completed the test with no shutdown. That's the way I read it.
My previous 3,1 with a GTX570 never shut down on me. It worked just great under load.
Lou
Only the Titan was able to drop the 3,1.
Barefeats couldn't get Titan to kill 5,1, even with Furmark.
The point I was really trying to make is that the card we have all been calling "safe", the GTX570, is capable of drawing just as much current as GTX780. I have yet to hear of a single instance of a 570 doing damage to a MP, so, ipso, ergo, other legal sounding word, the GTX780 is safe.
The only person to positively damage a MP via a GPU was the guy in Germany who used a GTX580 3 GB Windforce Edition. This card runs higher clocks than standard GTX580. He then not only over clocked it but OVERVOLTED it. AFter hours of playing games like this, his MP was never right again.
How he was able to do this damage without machine shutting off I do not know.
But now that I have seen the actual numbers and can see that a 570 can draw similar current running Furmark, I have deemed 780 safe. Titan is just over the edge. Running a line down from optical bay may help load balance a little more, but I don't think we know how much current those lines can deliver. The spec for the Molex connector is even higher than the 6 pin.
Spaz,
Agreed about the Titan without an external PS .... sigh.Does the 780 present a boot screen too? And thanks for the advice. I got 3 27" Samsung monitors to drive and I want them all at the highest resolution.
Frank
I don't think you get a boot screen with the 780. The conversation above about the 780's power consumption doesn't fill me with tons of comfort either.
^^^^Scroll to the last few posts in this thread:
https://forums.macrumors.com/threads/1648775/
You do get a boot screen with an MVC modified GTX780.
Lou
https://forums.macrumors.com/threads/1648775/
You do get a boot screen with an MVC modified GTX780.
Lou
I'm running one Titan (the original one) with the internal supply with no problems (6 pins x 2 though). Checked on heat issues using iStat Menus....and there are none to report. I'm very tempted to place another video card in my MP 5,1 and give that a try too....but which one should I go after? Any recommendations from the experts?
I go with that!
Best supported GPU thats official you can get is GTX 680...
No matter what you say its the only one that is hassle free... Its supported as a Mac GPU... no matter what, you won't be able to get that peace of mind with a flashed video card...
I sleep like a baby with my MVC Flashed Gigabyte 3 Fan GTX 780
Lou
Well. My brother is working as a graphic designer for a marketing firm that has very tights schedule... for anyone thats professional, when it's how you make a living and feed yourself... you pay for the extra peace of mind... All their hardware is covered with 4 hours onsite support... They have some hardware thats broken, it has to be fixed in the next 4 hours.
As for myself I'm a sys admin and I never took a chance with hardware thats used for day to day operations, not even a hard drive or a network card. anyone thats a professional won't take the chance to just hit that 0.5% of a possibility to get screwed... I don't mind to have a flashed card, I already have one in my 2009 Mac Pro 6 cores that I bought from MacVidCards... I just got a sweet deal to get a 680 Mac Edition for my 12 cores Mac Pro and it wasn't that much expensive compared to a flashed one...
Does anyone know anyone who has tried the latest 780 with 6g ram? I'm curious about that one, MVC introduced the idea here a few days ago, but he does not seem to have them in his ebay store.
Someone else is selling flashed versions on ebay, I want to know if its as smooth as the 3g version
Someone else is selling flashed versions on ebay, I want to know if its as smooth as the 3g version
I have tested one and two Nvidia Quadro K5000s for Mac in a MP5,1. I also compared running one and two of these K5000s with a ingle Sapphire Radeon HD 7950.
The 7950 requires two power cables, so only one can be installed in stock MP5,1.
The K5000 requires one power cable and draws no more than 122 watts, so two can easily be installed in a stock MP5,1.
The single K5000 was 1.75 times faster than the single 7950 for Adobe rendering.
Dual K5000s did little for Adobe rendering, but performance during editing/video workflows was significantly better than using a single 7950.
The K5000 can handle CUDA and OpenCL.
The 7950 can handle OpenCL only.
I'm sure the K5000 would out perform the 7950 for solid geometry applications.
The K5000 is 3x more expensive than the 7950.
Apple sells the K5000 for $2499, whereas OWC/NewEgg/B&H sell it for around $1800. The OWC has been raising its K5000 price from $1499 a few weeks ago and is now at $1799. The K5000 will end up being in short supply soon as Nvidia is slowing down its production of the card. So expect the K5000 price to continue to increase.
The 7950 requires two power cables, so only one can be installed in stock MP5,1.
The K5000 requires one power cable and draws no more than 122 watts, so two can easily be installed in a stock MP5,1.
The single K5000 was 1.75 times faster than the single 7950 for Adobe rendering.
Dual K5000s did little for Adobe rendering, but performance during editing/video workflows was significantly better than using a single 7950.
The K5000 can handle CUDA and OpenCL.
The 7950 can handle OpenCL only.
I'm sure the K5000 would out perform the 7950 for solid geometry applications.
The K5000 is 3x more expensive than the 7950.
Apple sells the K5000 for $2499, whereas OWC/NewEgg/B&H sell it for around $1800. The OWC has been raising its K5000 price from $1499 a few weeks ago and is now at $1799. The K5000 will end up being in short supply soon as Nvidia is slowing down its production of the card. So expect the K5000 price to continue to increase.