Subree 1.5 Purchase For Mac
The PSU is a completely proprietary Apple part. It cannot be upgraded. Even if you had the schematics, or knew enough about electronics to draw up your own- I'm not sure what you'd 'upgrade' in it. It's not like you can just replace a few capacitors and switching transistors and add a couple hundred watts to the output. That entire circuit inside there is going to be tuned for the rated output maximum, so trying to change that is going to be next to impossible without redesigning the entire PSU in the process. Likewise, there's the issue of how the whole Mac Pro is wired up internally.
Most of the power goes through the logic board, and therefore your capacity is limited to the thickness and width of the copper traces on the PCB. Those definitely cannot be upgraded, so you'd have to figure out a way to snake your wires down through the drive bay and into the GPUs.
If you're going to do that anyways, you might as well buy one of those 5.25' PSUs and get a proper PCI-e faceplate for the power input. No permanent modifications necessary. TLDR; you'd have better luck starting a kickstarter project or something to design your own classic Mac Pro replacement PSU with additional support for beefy GPUs. I'm not sure how many people would buy into that though given the existence of external PSUs and 5.25' PSUs.
PS: If you have some serious cash to burn, there's always a Magma PCI-e expansion box. They cost $$$$, but they have their own power supply capable of juicing several GPUs and the HBA will get you PCI-e 16x speeds back to the tower.
I believe Cubix also offers a similar solution that is exclusively designed for GPU use as well. My understanding is that just upgrade the power supply won't help. The cMP's power supply is quite good actually (1000W). However, there is no way for you to deliver those power to your graphic card through the mother board. If the cable is designed to only handle 75W, you should not draw 150W through it, regardless the power supply's performance.
Another feasible way to do it is add another power supply (e.g. In the optical bay) for the graphic card. That can keep you Mac Pro looks nice and tidy. I knew there would be someone far more knowledgeable in such matters than I that could explain this to me. Makes complete sense.
Now that I think of it, I do recall hearing about someone who modded their '09 cMP to have a power supply where the Superdrive lives. I'm assuming that you're referring to these when you say the 5.25' PSU's. Sounds pretty cool.
Are there any ones in particular you guys know about that would be ideal for the task of powering some of the beefier cards? I am only mildly considering this, but it's certainly an option. And I figured others could find this topic interesting. It's tempting to buy the 6GB GeForce 780 that MacVidCards has on offer. As it is tempting to wait until the Maxwell based 800 series arrives which promises fairly big power savings AND solid boosts in performance. But both are compromises.
One on waiting, and the other on knowing there's more power I could have NOW with a 780Ti, Titan Black etc etc. Thanks again for the info. I really appreciate it.
Additional Internal PSU disclaimer - completely untested as I've only ordered the parts, but I got this: (this came in a blank white box and was actually a Visiontek branded unit) this one looked better but apparently has been discontinued and have ordered this: I am hoping that hooking this up to the SATA port (lower optical bay) will turn the PSU on and off with the Mac itself. Won't be able to tell until it arrives though. Will confirm that plugging the PSU into the wall does. Absolutely nothing. (which I expected).
A lot of folks here in the forums have done some pretty slick GPU installs with extra power, some by tapping into the MP PSU. I am not going this route as I do not want to: a) fry myself, and: b) overload the OEM power cable. PS I see you're running a 660; that's what I'm currently using. Nice enough card.
Planning to swap to a 7970 and try a cheap 4K monitor once funds permit. First, though, I want to see if I can get the card working. Good luck with your system - let us know what you decide to do! Click to expand.The Mac Pro 4,1 & 5,1 have plenty of PCIe AUX power, unless you need more than 300 watts for your GPU(s). Remember you get 75 watts from the PCIe slot.
Each PCIe AUX 6 pin connector in the Mac Pro towers delivers 150 watts. Yes all three power pins in both of the PCIe AUX plugs are connected. The PCIe specifications don't required pin number two to have power, but it also does not prohibit it either.
In the MAC Pro 4,1 / 5,1 it is connected. To be clear, this delivers the same power as a 8 pin connector with out the extra sense and grounding pin on the 8 pin plug. Just buy the correct 6 to 8 Pin PCIe AUX cables and you are all set. I'm running a NVIDIA STRIX 980 Ti OC with two 8 pin plugs (150w + 150w + 75w = 375w). The Mac Pro 900+ watt power supply can handle it. I also have two 130 watt x5690s.
No issues during stress testing. Need more power.
Cut the plug off the apple power supply and terminate it with the standard ATX connectors. Then you can run additional power from a new replacement power supply of your choice. Click to expand.Yes a regular PCIe AUX 6 pin plug with only two power pins will deliver only 75 watts. The MAC PRO 4,1 and 5,1 have three connected power pins.
This is the same as the 8 pin PCIe AUX plugs, just minus the additional sense and grounding pins. Why are 8 pin PCIe aux plugs needed? Because the 6 pin PCIe AUX spec does not require pin number 2 to be connected. The PCIe AXU 8 pin spec has all three pins connected and always provides 150 watts. 6 pin PCIe AUX may or may not. In the case of the Apple Mac Pro 4,1 and 5,1 towers, they do provide the power on all three power pins.
150 watts from each 6 pin connector for a total of 300 watts. Yes a regular PCIe AUX 6 pin plug with only two power pins will deliver only 75 watts. The MAC PRO 4,1 and 5,1 have three connected power pins. This is the same as the 8 pin PCIe AUX plugs, just minus the additional sense and grounding pins.
Why are 8 pin PCIe aux plugs needed? Because the 6 pin PCIe AUX spec does not require pin number 2 to be connected.
The PCIe AXU 8 pin spec has all three pins connected and always provides 150 watts. 6 pin PCIe AUX may or may not. In the case of the Apple Mac Pro 4,1 and 5,1 towers, they do provide the power on all three power pins. 150 watts from each 6 pin connector for a total of 300 watts.
If the STRIX 980 Ti OC can hardly pull 275 watts, why would the manufacture put a more expensive 8 pin connectors on? Why not a 6 and a 8 pin like the newer lower power Pascal cards?
I think it is for the folks that really like to overclock their equipment. So this is why ASUS put the bigger power plugs on the card. As for how much power can be drawn from the 6 pin connector on the Mac Pro 4,1 5,1, it makes sense the power protection will shut the machine down when the power supply limit is exceeded. The Mac Pro 4,1 5,1 has a 980 watt power supply. So if we where to use 375 watts just for the GPU, there would be 605 watts for the system. In my case I have two x5690s, If the CPUs used the max wattage there would be 345 watts left to run everything else.
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I think there is still enough margin on the power supply. The pin out of the mini 6 pin PCIe AUX on the MAC PRO 4,1 5,1. Looking at the pin diagram, you can see the only pins that provide power on both the 6 and 8 pin PCIe AUX are pins 1,2 and 3. Jacksonville jaguars television. On the 6 pin plug, pin number 2 may or may not be connected. See note in diagram.
Yes the number 2 pin is connected on the MAC PRO 4,1 and 5,1. Electrically by jumping the extra ground and sense as depicted in the picture you signal the GPU it is a 8 pin connector. If there are only two power pins in this configuration you may run into a overload issue, but the Mac Pro has all three pins powered. Yes you can draw the maximum 375 watts for a single GPU on the MAC PRO 4,1 5,1. Here are the meter tests showing all three power pins connected with power.
Bit-Tech did a review on the Strix 980 Ti OC. Looks like the GPU is using well over 300 watts. Click to expand.Make it easier to sell / let the other believe it's more powerful / more juice for user OC.
There are plenty of reasons, but I can 100% sure that the card will not pull anywhere near 375W (with stock setting) simply because it has dual 8pin input. Anyway, the review shows that for normal use (e.g. Demanding gaming), the average power draw is just 236W, and even the peak can't reach 275W. I know Furmark can do it, but I don't think that we consider Furmark as normal use, right? Yes a regular PCIe AUX 6 pin plug with only two power pins will deliver only 75 watts.
The MAC PRO 4,1 and 5,1 have three connected power pins. This is the same as the 8 pin PCIe AUX plugs, just minus the additional sense and grounding pins. Why are 8 pin PCIe aux plugs needed?
Because the 6 pin PCIe AUX spec does not require pin number 2 to be connected. The PCIe AXU 8 pin spec has all three pins connected and always provides 150 watts. 6 pin PCIe AUX may or may not.
Subree 1.5 Purchase For Mac
In the case of the Apple Mac Pro 4,1 and 5,1 towers, they do provide the power on all three power pins. 150 watts from each 6 pin connector for a total of 300 watts.