So, as much as I'd like to ship off a few dozen of these babies we've been holding off due to lingering apprehension about power. I sent some cards to Barefeats.com for testing. He got FANTASTIC results, but was able to replicate my power issue.
Specifically, using any of the 3 cards (1080Ti, Pascal Titan-X and Pascal Titan-Xp) and running the CUDA-Z benchmark isn't a problem...until you hit the "Heavy Load Test" button. Then, with the Titan cards you will almost ALWAYS have an immediate shutdown. (within 2 seconds). With the 1080Ti this will sometimes require upwards of a minute, but still MOST will eventually shut down the machine. Oddly, the former "Power Virus" known as Furmark can be run for any length of time with few, if any, shutdowns. Even more perplexing is that Hardware Monitor shows LOWER numbers than with the 980Ti and Titan-X Maxwell. So the power draw must be a very fast spike, faster than the 1-2 seconds refresh for the sensors. I was hoping the issue was my aging 4,1/5,1 which has tested MANY cards. But Rob has found same behavior and posts here and at Netkas have had a few other people report the issue. In addition, one customer has reported that a 1080Ti he received will shut down the machine playing UT. He tested in other high draw situations and found the card stable. We have found a solution that was tested and confirmed working by Barefeats. A cable that connects power from a SATA drive makes the computer continue running no matter what. I have found no way to cause the power issue using this cable. Some may not like this additional cabling. Sadly, the only other choice is to stick with a 1070 or 1080 (or two) or use external power. I look forward to your thoughts and experiences. In fact, most people may never run into this issue using the Dual 6 pins inside the machine, but I need to make everyone aware of this before they buy. For the few we have already shipped (less than a dozen) we will offer either the additional power cable or a full refund (no 10% restock).
86 Comments
Evan Kultangwatana
5/16/2017 04:21:46 am
Very interested still! I have a TitanXP ready for flashing.
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2/13/2020 06:55:11 pm
Yes, you can use your laptop with its webcam for the vlog, but to point you out, you're going to need something more . It can be very confusing to find the best vlog camera to start a video blog.
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Seth Goldin
5/16/2017 07:34:47 am
Thanks for this information. What are the proper power cables that can supply external power?
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Vern Klukas
5/16/2017 10:10:41 am
I'm waiting for the flashing service to be expanded to the Titan XP, and have already decided that I'm going to mod my 5,1 machine's power supply by tapping in two 8 pin PCIe plugs to the power supply leads going to the backplane board. The 5,1 power supply is more than adequate to drive the cards (950W), the only downside is the position of the tap before the backplane board means that the Mac can't monitor the power draw and won't ramp up the power supply fans. This will also mean I can keep my current card in the machine which is a bonus.
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Jonathan
5/16/2017 01:57:43 pm
Vern,
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Vern Klukas
5/16/2017 02:23:04 pm
Certainly better if you have a drive on the end of the SATA plug.
Yukon Dave
5/16/2017 04:29:15 pm
Below is a link to what has to be the best description of the 2qty PCI on board 6 pin power ports I have seen. What is great is the two AUX ports can support up to 150W each if a proper 6 pin to 8 pin cable is used. 75W comes from the PCI slot. No need to use a Y connector or SATA power.
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Surrat
5/16/2017 09:17:20 pm
Dont forget the Pixlas mod thread. This mod is the best I know for getting full power to your vid card.
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Mandril420
5/16/2017 05:12:21 pm
Another option is the EVGA Powerlink. Since the 8 pin pulls 150W and the 6 pin 75W on the GTX 1080Ti using an EVGA Powerlink should balance the power pulling from both PCI booster cables on the motherboard preventing any of them from going over 8.0A which is when the shutdown happens. It's basically pulling too much from the 8Pin side.
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Mandril420
5/16/2017 05:45:27 pm
Just tried this on my GTX 1080Ti. It still shutdowns even with the EVGA Powerlink. Will stick with my Pixlas mod I guess. Btw what kind of cable are you guys using Macvidcards? Dual Sata to 6Pin and Dual 6Pin to 8Pin?
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Marius
5/16/2017 06:00:44 pm
I think if one does plan to run 250w cards, getting additional power is highly recommended.
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5/16/2017 09:36:11 pm
Guys, matters not a bit that one guy thinks a PCIE cable in 4,1 can carry 150 Watts. Utter gibberish in this discussion. The 4,1/5,1 will shut down if 1080Ti or either of the Titan Pascal cards is run at full tilt using the Dual 6 pins. End of discussion. Please read the post again. We've sold fewer than ten of the cards, 2 customers have not written to say they are experiencing shut downs. That's better than 20% reporting trouble.
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Andrew
5/19/2017 05:50:07 am
Hi!
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Winston
12/16/2017 03:52:13 pm
FWIW, I just installed a 2x 8-pin card (EVGA 1080Ti FTW3) and am running power from the PCIe Aux via 2x 6-pin mini to 8-pin and unfortunately the Mac will shut down immediately during the heavy load test of Cuda-Z as described.
JonathanH
8/11/2017 05:02:27 pm
We've purchased them and have experienced the issue (Titan X) but haven't reported it yet. Came here to see if there was anything we could do. I'll be looking at some of these solutions as well as an external power source.
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MacDave
5/17/2017 09:42:16 am
I have a (Maxwell) GTX Titan X MVC-flashed card in my MacPro5,1. I am considering upgrading to a 1080 TI or Titan Xp. In the past 16 months, I have experienced one or two possible shutdowns due to the GPU.
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Ben King
5/17/2017 11:08:12 am
Hi Dave
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MacDave
5/17/2017 04:23:55 pm
Hey Ben,
Ben King
5/17/2017 11:02:52 am
I would always advocate running power from the SATA either from an HDD Drive bay, the Spare Optical (Molex on 3,1 and SATA on 4,1 & 5,1) or an external PSU.
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JLE67
5/17/2017 02:08:43 pm
For me, the Pixlas mod is the most elegant. The real difficulty is to found all needed parts perfectly adapted to the mod.
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nikrox
5/17/2017 07:33:16 pm
Is it possible to draw power from the dual 6pin to single 8 pin and then run additional power from dual SATA 15pin to 8pin?
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Dave Key
5/19/2017 01:27:21 am
Mmm...
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Ben Ellis
5/19/2017 11:36:18 am
A bit of advise please...
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Eric
5/30/2018 08:21:45 pm
Hi,
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Mikael
5/23/2017 01:29:08 am
I'm having the described power issue with my Titan Maxwell card maybe once or every other week, usually when running Premiere or Resolve. Would this mod solve my problems. I have two MP 5.1 running the Titan X Maxwell, one bought from here and one bought from Mac Store UK.
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Marmada
5/23/2017 11:39:40 am
So to be clear, with the 1080 (non Ti) the shutdown issue doesn't happen? So would I be able to do 2 1080s in the 5,1 and use the standard power? no mods?
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JD_Fordyce
6/6/2017 01:14:29 am
I have this same question. Looking for the best GPU for my 2012 5,1. I want the 1080 ti but if it's too much for the PS then what is my next best option? 1080, 980 ti or can I do dual 1080s??? Reliability is more important to me than raw power.
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David
6/6/2017 10:29:51 am
I cant answer the question about two cards, but I'm running one 1080 (EVGA SC) pushing the computer hard and have not had any issues with a ton of apps open, running Resolve including 4K footage, Lightroom etc.
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wolfman
5/23/2017 05:14:56 pm
I'd like to thank MVC for their excellent service and keeping the classic Mac Pro community humming right along with the latest GPUs.
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RollTideBrad
5/26/2017 02:10:01 pm
I have sent an email to macvidcards about my 1080 ti issue with bootcamped windows. I want to share it with you and see if any of you experience the same issue as I do right now.
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Marius Jenzer
5/29/2017 11:25:14 am
Did you use DDU to remove the driver?
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Surrat
6/4/2017 12:27:48 am
I have had this happen with my GTX 680 Mac Edition, and my non-flashed Titan Xp. It seems related to what port your using. When I got a 4k sony tv to use as a monitor, it only has HDMI inputs. Using HDMI works fine in Sierra, but Win10 black screens on boot if you load any display driver. If I use HDMI on the 680 it does the same thing, switching to DVI on the 680 stops it and allows the windows driver to work. The Titan Xp has no DVI, so I cant do anything. I also tried a display port to HDMI2.0 adapter, and it made no difference. I doubt MVC can fix this as it happens on a genuine 680 mac edition too. Probably some problem in the nvidia driver for windows.
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Just installed my 1080Ti in Mac Pro 5,1 with 6 Core 3.33 Ghz. Latest Nvidia drivers.
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PistolPete
6/11/2017 12:54:10 pm
I am really enjoying my new 1080 Ti in my 5,1. I have only had it for about two weeks, but I have had a few things happen and wanted to see if anyone else is experiencing similar issues.
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Jason
6/19/2017 09:11:51 pm
Dell monitors and Macs can be hit or miss. I have an old Dell 2408 that I love for all of the ports, but it is a real pain on OSX, as it regularly flickers and will many times display static (like old tv style). It takes putting the display to sleep and awaking it to get it back, though sometimes take multiple tries to get it. So, I don't think I would look at the Mac as a sole cause, but rather the combination. The newer Dell monitors seem to be even more fickle and that was why we stopped purchasing them.
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Executor
6/15/2017 05:07:03 pm
Any news on Titan Xp flashing services? I really need to get some cards flashed and I don't see the option to flash Titan Xp cards on the store front, I know it is possible since a store in the UK that appears to be affiliated to Macvidcards offers the Titan Xp.
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Andy
6/16/2017 04:41:01 pm
Finally got time to install my 1080 Ti this week. I decided to give the standard mini 6-pin headers on the logic board a shot before using the additional SATA power cables and I'm happy to report no problems whatsoever with CUDA-Z (Heavy Load Test) or FurMark under either macOS 10.12.5 or Windows 10. No shutdowns, no stuttering, no funky lines - all perfect. Very, very impressed with the performance of this card. Warms the room nicely, too!
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Mark
7/21/2017 06:44:34 pm
What system are you using this with ? Hardware/software?
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Andy
8/26/2017 06:01:42 am
Just spotted this question. It’s a genuine Mid-2012 MacPro5,1 with two 6-core X5690 (3.46GHz) CPUs and 32GB RAM over 6 sticks (8+4+4 per processor). I bought it towards the end of manufacture in 2013.
Jason
6/19/2017 09:14:05 pm
I really wish you would sell the cabling kit (sata) with the cards, especially considering the price. Or, if it needs to be additional, offer as an option. On the verge of pulling the trigger on a 1080TI, but need to know I am getting a working solution. I will make available a spare sata port on the optical side.
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Andy
6/20/2017 05:36:22 am
Just to clarify for Jason, a full cable kit was included with my 1080 Ti, which covered every option for powering the card.
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Dave Key
6/21/2017 04:54:43 am
I suppose this cable kit will also be included with Titan Xp when this card will be available at order on the site (still not when writing these lines).
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Heavyboots
6/21/2017 08:11:37 am
So, I'm the one that reported that UT was causing panic shutdowns. So far, nothing like that since installing the new cable, although I had to take an HD out of bay 3 and put it in an external dock. Good news and great card!
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JLE67
6/23/2017 07:12:26 am
Hi,
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PistolPete
6/27/2017 07:58:22 pm
I have experienced another shutdown and would like to see if anyone can help or has at least experienced something similar. I am unable to interpret the crash log but the setup was the same as when it crashed on me early on in using the card a few weeks ago. Sketchup 2017 running with Vray conducting an interactive render (real time). Please advise.
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heavyboots
7/11/2017 08:17:08 am
FWIW, have discovered the SATA fix is not 100% still. It seems much better than before, but I have now found one place in Deus Ex:Human Revolution that will reliably power down the computer if I look straight up at the trees with the light filtering through them. (Climbing out a manhole basically.)
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ChrisKnight
7/11/2017 09:27:19 pm
Does the 1080 ti you sell include the SATA power adapter cable? The description says "2 Modular PCIe power cables" but doesn't indicate if one or both also connects to SATA.
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JLE67
7/13/2017 01:47:06 pm
Yes it is included…
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JParker
7/31/2017 11:12:06 am
Seriously considering a dedicated 1080 ti over the 1080 for a 4K Premiere/Resolve workflow--Currently on a 770 in a 5,1 that just isn't cutting it. I have an open SATA port in the 2nd optical drive, has anyone attempted/been successful powering a 1080 ti from the optical sata port for a video workflow?
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Andy
8/1/2017 12:47:38 am
I'm still happpily using my 1080 Ti from the two standard mini 6-pin headers with a workload of Premiere and some Windows gaming. The system hasn't missed a beat over the past month, but this thread is evidence that not everybody is so lucky. I can't see you'll have any trouble running it with a feed from that optical drive 12V rail, but YMMV - just thought my experience might help you take the plunge!
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JParker
8/1/2017 12:20:36 pm
Thanks Andy! That's good to hear. Are you using the Mac Vid Cards flashed version? I'd like to get a card with DVI on it since I'm still running Apple 30" cinemas and the MVC version is only DP/Hdmi. Considering sending in for flashing or trying it unflashed for a while.
Andy
8/2/2017 03:24:13 pm
Yes, bought my 1080 Ti straight from this site. If you're in the US the flashing service is cost-effective, but given the price of the cards in the UK, it wasn't much more for a flashed one shipped over, even with 20% tax thrown on top.
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Jacob
8/24/2017 08:29:41 am
Couple Questions.
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Trevor
8/25/2017 09:25:31 pm
Jacob wrote:
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Jacob
8/25/2017 09:44:50 pm
Thanks for the info.
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Mark
8/28/2017 09:07:28 am
Would very much like to have an invest in a 1080 TI card. Looks like it is pretty solid but not lots of posts. Can you tell me if things seem stable enough for Windows gaming in boot camp. Also Will this card still work in Windows and on the mac whenever MAC OSX drivers are finally released? If so I'm ready to jump on one!
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Jacob
8/28/2017 09:30:39 am
Wish I could help. I've yet to be able to get it to work. I'd love to have a 1080ti card in my system as well. Might need to go to PC if Apple can't get they're shite together.
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Jacob
9/5/2017 10:12:47 am
Do the SATA ports for HardDrives...have more power than the Sata in the Optical bay?
Verne
10/14/2017 10:45:42 am
I ran the card for a week without problems with one PCIe cable from the motherboard and one from one of my SATA bays. I then ordered and installed the dual 6 pin to 8 pin adapter cable for one 8 pin slot in the card, and the SATA power cable for the other 8 pin slot - just like Saeed has in his video. Even though I think I'd be fine with just the one tap off the motherboard, I figured that for about $8 for the adapter cable, why not? So far so good. No issues.
Sepo
11/18/2017 02:28:12 pm
Hi
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12/4/2017 07:41:24 pm
Could you provide (illustrated?) instructions for how to install the card + the extra power cable? Is there any wire cutting involved? Does it require one SATA slot to be empty?
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William Shaw
12/27/2017 04:36:56 am
I was unable to get the GTX970 to work using the supplied 6 and 8 pin connectors attached to the logic board on a Pro 3,1 with four disk drives installed. I had to do a pretty substantial disk repair when the 970 not only failed to start but triggered a crash. Tried again recently with an external PSU powering the 970 and it worked first time with no problems. The card is fine but people should be aware that with a loaded older 3,1 system even the 970 can glitch over power. I can't exclude a problem with the logic board connectors, though had been running an older GTX 285 off both, a Quadro 4800 off one, for many years with no problems. I should add I love the card otherwise but the power budget issue might not be confined to 10-series and Titans with older and loaded Pros. I note the card was not on the list of those recommended for the 3,1 but went ahead as it did not need me to do the hack to get me to Sierra needed for Pascal cards.
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Uli
2/28/2018 12:19:14 am
Hi
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John
3/23/2018 02:46:36 am
the Pixas mod direct off power supply cables provides the most reliable outcome.
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xauron
4/25/2018 07:21:17 am
But this problem is just with the cMP, right? No as eGPU, nor hackintosh problem, right?
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6/29/2018 04:02:10 am
I'd like to know if these will work with a hackintosh build?
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Scott Kuehner
2/26/2019 05:26:33 am
I bought the "Low Power" - One 8-Pin MacVidCards' GTX-1070 8GB GDDR5 VRAM Card for my Hackintosh.
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Synchro3
7/28/2018 09:49:41 am
Could you try the CUDA Heavy load test with an EVGA PowerLink installed?
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12/16/2018 08:29:55 am
Hello! I just would like to give a huge thumbs up for the great info you have here on this post. I will be coming back to your blog for more soon.
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Andy
7/12/2019 08:08:12 am
Just use an EVGA Powerlink and two normal mini-6-pin to 6-pin cables for the 1080 Ti. Feed in to the Powerlink on those and output using the 6-pin and 8-pin outputs included in the Powerlink box. Evens the load over the two logic board supplies and I've not had a single shutdown since I fitted mine over a year ago.
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Hi Andy, I really appreciate this response. Sorry mine is so late. I have an EVGA Powerlink. It has two 8-pin inputs, and two 8-pin outputs. My 1080 Ti has one 6-pin input and one 8-pin input. Are you saying I need to take two 6-pin cables, plug them into my motherboard, input those into my Powerlink (leaving two of the pins empty on both 8-pin inputs). Then output a 6-pin from the Powerlink (leaving two of the Powerlink output pins empty), into the 6-pin input of the GPU. And output an 8-pin from the other Powerlink output, into the 8-pin input on the GPU?
Andy
7/24/2019 04:52:44 am
More or less, though your Powerlink should have come with replacement output connectors in the box. Take the 1080 Ti out of your machine, remove the cover from the Powerlink and loosen the bolts on the output connectors (the inputs are not changeable). Remove one 8-pin output and replace it with the supplied 6-pin output connector. Keep the bolts loose and make sure everything aligns with the GPU. Once you're happy, screw down the bolts, replace the Powerlink cover and connect the Powerlink to the Mac Pro logic board using two mini 6-pin to 6-pin cables. This will leave two connectors disconnected on each of the Powerlink 8-pin inputs - this is normal and you'll find you can only connect the 6-pin plugs in one position. Then put the GPU back in the Mac Pro and click the Powerlink into position.
Andy, I can't thank you enough my man. You saved me a lot of time reading through this long thread... which I have done quite a bit of. I just saw this link that Synchro3 posted (thanks Synchro3!)...
Well, I did exactly what we discussed and I've had the same issue with my GTX 1080 Ti. When I first got the card, I tried taking an HDD out of one of my drive bays and connecting an 8-pin to SATA adapter to it. That's when I first encountered the sudden shutdown, screen goes to black, issue. Next I tried a this solution...
Andy
7/31/2019 01:29:40 am
Ah, nuts, sorry it's not worked. Something must be just out of tolerance for your PSU; you using a lot of spinning drives in the machine? There must be something spiking the 12V supply beyond what it's happy providing. You could strip back components to the bare minimum and try again, but if this is machine you need for Getting Stuff Done I'd just resort to an external PSU and be done with it.
Andy, I can't thank you enough my man. You saved me a lot of time reading through this long thread... which I have done quite a bit of. I just saw this link that Synchro3 posted (thanks Synchro3!)...
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tom
10/16/2019 12:34:28 am
l woud like advice
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Aaron
6/29/2020 06:23:38 am
Hey, ive been searching and searching for hours on the forums and this is the most valuable post ive found. ive just purchased the GTX1080ti with the Sata to 6 pin and the duel 6 pin to 8 pin.
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