The fans eventually settle down to normal speed. But it varies how long that may take, some times hours. Once they come down, they stay normal till I power off the mac. Of course I do sleep the mac every night rather than turning off and that doesn't bother the fans. This never happened before and I had this computer since 2009. I have already tried NVRAM and SMC reset. I read some where in this forum about similar fan issue (from unsupported AMD gpu) that gets better by stressing the card.

I can't find that message again to learn more details. I'll really appreciate if any of you mac gurus can help solving this problem. Click to expand.No, flashing the card won't help.

The work around is to run Luxmark for 10-15s after boot. You can auto load that after login if you want to. It's a known bug for 4,1 or flashed 5,1.

It seems SMC related (that's why real 5,1 is not affected). Another work around is use MacsFanControl to setup your own fan profile. PCIe fan base on PCIe ambient, min 38, max 58 PS fan base on PS 2 temperature, min 36, max 58 Since MacsFanControl alter the fan profile by inserting the target fan speed. That will completely override the SMC fan setting. Of course, you can use / write any software to do that as well as long as you can control the PCIe and PS target fan speed. However, AFAIK, there is no fan control software alter the target fan speed like MacsFanControl does. All others are altering the min fan speed, which is good for general use, but unable to fix this high idle after boot.

Therefore, you practically has no choice unless you write / mod another fan control software for your own use. If you only boot once every few days or even weeks, I suggest the Luxmark method. (Unless you want a cooler PSU etc) If you boot few times a day, then MacsFanControl method should work better (but it will take up tiny bit CPU resources). You may also try SMC reset.

I tested this method. If you keep trying, the fan will eventually go back to normal (may need 10 attempts), but the bug usually come back in jut few reboot. So, not worth to do so. Click to expand.Thanks for your answer, anyway it sounds strange if you read here: And ' June 2017 Update: With the release of mid-2017 iMacs, Apple has officially used Polaris Ellesmere GPUs in its lineup.

The wonderful news is 10.12.6 will include drivers for RX 470, RX 480, RX 570, and RX 580. This means starting with 10.12.6 and future macOS version, we don’t need to perform these kext modifications anymore to use these cards in our Mac Pro towers' Another question: Is enough keep just a cable (8 pin to mini 6 pin) or better use a second cable (6 pin to mini 6pin) wired to the second Molex port into the Mac? Thanks for your answer, anyway it sounds strange if you read here: And ' June 2017 Update: With the release of mid-2017 iMacs, Apple has officially used Polaris Ellesmere GPUs in its lineup. The wonderful news is 10.12.6 will include drivers for RX 470, RX 480, RX 570, and RX 580. This means starting with 10.12.6 and future macOS version, we don’t need to perform these kext modifications anymore to use these cards in our Mac Pro towers' Another question: Is enough keep just a cable (8 pin to mini 6 pin) or better use a second cable (6 pin to mini 6pin) wired to the second Molex port into the Mac? Click to expand.Check your system info, which ever the AMD kext loaded (red circle), that's the one you need to mod (name in green circle). My system is running a R9 380, NOT RX580, the kext required to mod is different.

However, be careful. Once you mod the kext, it's no longer signed (purple circle). AFAIK, it means the kext won't be loaded if SIP enabled (e.g. After PRAM reset).

Recovery partition will not be affected. You can always boot to recovery partition to fix it. But you better know what's the potential problem. Check your system info, which ever the AMD kext loaded (red circle), that's the one you need to mod (name in green circle). My system is running a R9 380, NOT RX580, the kext required to mod is different. However, be careful. Once you mod the kext, it's no longer signed (purple circle).

AFAIK, it means the kext won't be loaded if SIP enabled (e.g. After PRAM reset).

Recovery partition will not be affected. You can always boot to recovery partition to fix it. But you better know what's the potential problem.

I'm told I could get a Nvidia GTX 970 graphics card for my Mac Pro (Mid 2010 - with Yosemitie 10.10.2) but. If I install drivers for the new card (whilst my old card is in place), can I just pop it in and away I go?. Is everything required (apart from drivers) included in the box or do I need to buy extra cables?. If I have to buy extra cables, where do they go, will I find instructions for this in the box?. What is the likelihood that with a future OS update this card will no longer work?. Is it completely safe to use with the regular power supply in my Mac, or is there any risk at all?

Sorry if these obvious questions, I am just aware that most people on here are more technical than myself and I want to avoid problems I won't understand how to fix. Okay, theposco, maybe I can help you out. Support for the card is built into the OS more than likely 2. Yes-everything required should be in the box, and you shouldn't need to buy extra cables (ask the card's seller to make sure) 3. You may.may not not find instructions for this in the box, but the power connectors are easy to find. They are at one end of the logic board closest to the front of yor Mac Pro, about halfway up. 2 8-pin connectors.

Bit tricky to get 'em on, but once you do, you're good to go 4. The likelyhood is almost none. I think Apple even support the X2600 and the 8800GT for crying out loud, maybe even the GT120 5.Yes, it's totally safe. Most graphics cards require a power connection of some kind, but that's about it. No addon power supply needed. Trust me-here there are no obvious or 'dumb' questions. We all have to learn somwhere and sometime, and the only way to do that is to find out, get info, and ask questions.

About the only thing I should tell you, theposco, is that with the 2010 Mac Pro, to install a video card, there's this little bar in place. I guess it was put there to stabilize the video card. I couldn't figure out how to get the bar back, to get it to go down and out of the way so I could install a newer video card. Very Annoying. Then I asked a question here, and I found out that there is a button by the fan shroud. If you push that button, then the bar goes back, goes down and out of the way. I wouldn't have known that before.

Oh one last thing-if the card has been flashed, or it's a Mac version, you will get a boot screen but if it's a PC one, it'll work, but you won't see anything until the graphics drivers have been loaded. I think there's a 4 gig version out there, but you have to get it flashed.evga and PNY work fine.

Good luck John B. Okay, theposco, maybe I can help you out. Support for the card is built into the OS more than likely 2. Yes-everything required should be in the box, and you shouldn't need to buy extra cables (ask the card's seller to make sure) 3. You may.may not not find instructions for this in the box, but the power connectors are easy to find. They are at one end of the logic board closest to the front of yor Mac Pro, about halfway up. 2 8-pin connectors.

Bit tricky to get 'em on, but once you do, you're good to go 4. The likelyhood is almost none. I think Apple even support the X2600 and the 8800GT for crying out loud, maybe even the GT120 5.Yes, it's totally safe. Most graphics cards require a power connection of some kind, but that's about it.

No addon power supply needed. Trust me-here there are no obvious or 'dumb' questions. We all have to learn somwhere and sometime, and the only way to do that is to find out, get info, and ask questions. About the only thing I should tell you, theposco, is that with the 2010 Mac Pro, to install a video card, there's this little bar in place. I guess it was put there to stabilize the video card. I couldn't figure out how to get the bar back, to get it to go down and out of the way so I could install a newer video card.

Very Annoying. Then I asked a question here, and I found out that there is a button by the fan shroud. If you push that button, then the bar goes back, goes down and out of the way.

I wouldn't have known that before. Oh one last thing-if the card has been flashed, or it's a Mac version, you will get a boot screen but if it's a PC one, it'll work, but you won't see anything until the graphics drivers have been loaded.

I think there's a 4 gig version out there, but you have to get it flashed.evga and PNY work fine. Good luck John B. Excellent, thanks for such a straightforward answer. Just one last thing, I have heard about getting cards flashed, but didn't know what that meant. I have just Googled it and now I see, kind of like tricking the card into thinking it is originally for Mac.

I live in the UK and at the moment, don't know of anywhere that provides a flashing service of graphics cards. I understand that if I don't get it flashed it will still work, but I will lose my boot screen which I could need at some point in the future if I encounter a problem with my system.

If anyone has a link to a place in the UK that flashed Graphics cards that would be useful, thanks. The hatter wrote: This FAQ Ok so it looks like I am fine to buy the 970, but wouldn't it be better to have the boot screen? Could I put the 970 in, but also leave my original graphics NVIDIA GeForce GT 120 512 MB card in so I get the boot screen or would that not work? In my Mac Pro there are two 16x and two 4x PCI slots, but I don't know what those numbers mean. I already have a Sonnet Tempo card in one of the slots with my boot drive SSD. Could I use three slots (two GPUs and the Sonnet) fine or would one of the slots not work properly as it is rated differently?

With regards to drivers you would want to download and install Nvidia's latest drivers and latest CUDA software. These will work better than the built-in Apple drivers.

Note: For this model I believe you need to run Yosemite and the drivers are not compatible with Mavericks. The PCI power cables need to be special Mac ones. They are available on Amazon and eBay.

The Mac logic board end is a mini connector smaller than the equivalent PC connector. For example Flashing a card means it will show up during booting, and this means you can see the options to do things like holding down the Option key to select a different boot drive. Without being flashed you can still use the card and still boot but would have to use the Startup Disk control panel to switch boot drives.

You would also not be able to use things like booting into single-user mode, Internet recovery mode, hardware diagnostics mode, etc. For the GTX 970, or GTX 980 only one person so far seems to offer a service for flashing these cards. Unfortunately they are located in the USA and this means shipping the card to him, paying a fee, and then paying to get it shipped back with the possibility of getting stung by customs again.

See The GTX 680 which obviously is a lesser card is possible to flash ones-self. For non-official video cards Apple do not enable audio via their HDMI or Displayport connectors, fortunately there is a free third-party kext called HDMIAudio1.1 which fixes this and so far works fine with Yosemite.

I have had a problem with the EVGA GTX 970 Superclocked edition with my Mac Pro mid 2010 5,1. I bought it yesterday and when I was about to place it inside my mac and turn it on, I got a black screen. The card is not compatible OTB and I do understand that Imust have the web drivers enebled for it to work.

I have connected my HDD to my mac book and booted from it and managed to install the drivers. Once I place it back into my mac pro, the screen is still black, even though the web drivers are selected to run as default. What can I do about this? I have had this graphics card up and running for a while now, but the other day I reset the PRAM due to another unrelated issue and now it isn't working. I posted about it on here under a different title but no one has responded.

Here is what I wrote: Nov 27, 2015 2:22 AM As the title says, my Graphics card is not being recognised on boot up, all I get is the black screen. I had installed a USB3 card into my 2010 Mac Pro and it wasn't working, so the manufacturer suggested I try a PRAM reset. That's when the problems started. I haven't been able to get the 970 working again since. At the moment I have my NVIDIA GeForce GT 120 512 MB installed.

I have tried a few things already. I tried downloading this driver again: 10.10.5 has (14F27) which I found here: (I checked, it is the right one for my installed version of Yosemite).

I also tried to use TimeMachine, but the problem is that my TimeMachine is a RAID configuration in a separate box connected by a SATA cable and so there didn't seem to be that option available when I tried to find it in the Utilities menu drop down, when installing a copy of Yosemite from a USB. I thought maybe there was a file somewhere that just needs to be reset back again so it will all work as before, but I don't know what I would need to change.

I have a TimeMachine backup I could use for that so if you know how I could make the most of it that would be great! Any ideas why this has happened and if it is fixable?

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Put the card in PCIe slot #3 - For those of you reading the boards to find out why a nvidia gtx 970 doesn't work in a mac pro 4.1: I finally solved the problem, after loading the nvidia drivers, by moving the card to the 3rd slot - it would not work in slot 1. The screen remained black, and the computer went into a loop of constant restarting, the only exit from which was holding down the power button until it turned off. I read that in the Mac Pro 2008 the cards didn't work in slot #1, but nothing else had solved my problem, so I moved my card anyway and it booted right up with the Nvidia web drivers. Install the card in PCIe slot #3. Apple Footer. This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the efficacy of any proposed solutions on the community forums.

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