Mac Pro 2013 power rating

This thing isn't meant to be used at full power, right?

I mean clearly 450W isn't enough to power 250W+250W for the D700s, 130W for the processor, and maybe around ~30-50W for the rest of the system?

What's the catch here? Why underpower it? Why make a product that can't handle its own specs? Even if there was a bigger power source for all of this to work, that "cooling system" has nowhere near the capacity to manage all of that heat. I'm of course assuming full usage on both the graphics and cpu at the same time, which isn't at all an uncommon task.


What I want to know how much throttling happens, and at what configuration can i fully use all of the components at their full potential? Can the base system configuration do this?

Mac Pro

Posted on Jan 11, 2014 1:24 PM

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16 replies

Jan 11, 2014 2:15 PM in response to Kappy

Sorry, but I did not get you were referring to the new model. Didn't notice in the title. Duh!


If the PSU is rated at 450 watts continuous power, then it can handle peak loads up to 1200 watts. Presumably, this means that in any typical use one would unlikely have the CPUs and the GPUs all maxed out at the same time. If the machine ever hits 1200 watts it would likely only be on peaks as opposed to continuous power draw.

Jan 11, 2014 1:31 PM in response to gelatinousjelly

The PSUs are rated over 1,000 watts. So, I don't quite understand your question.


Electrical and operating requirements


  • Line voltage: 100-120V AC or 200-240V AC (wide-range power supply input voltage)
  • Frequency: 50Hz to 60Hz single phase
  • Current: Maximum of 12A (low-voltage range) or 5A (high-voltage range)
  • Operating temperature: 50° to 95° F (10° to 35° C)
  • Storage temperature: -40° to 116° F (-40° to 47° C)
  • Relative humidity: 5% to 95% noncondensing
  • Maximum operating altitude: 10,000 feet


Input power is rated from 1200 to 1400 watts.


300 watts is for the PCIe slots, not the 500 watts you've stated.

Jan 11, 2014 2:19 PM in response to gelatinousjelly

there was a good discussion as often happens over on MacRumors MacPro forum that touched on this very aspect and it does point to it not being able to handle maxing out and stressing both graphic units plus processor.


I usually throw in 100W for RAM, storage (even though this one barely needs any for its PCIe-SSD), and whatever power goes into 6 Thunderbolt ports.


300W use to be what 4 x 75W for the four PCIe slots in OLD Mac Pro.


Electrical and operating requirements

  • Line voltage: 100-240V AC
  • Frequency: 50Hz to 60Hz, single phase
  • Maximum continuous power: 450W

http://www.apple.com/support/macpro/



Step 22

  • With a rated output of 12.1 Volts and 37.2 Amps, we're looking at a 450 Watt power supply. The power supply has no dedicated cooling, and relies on the main system fan to keep cool—allowing the Mac Pro to idle at a whisper-quiet 12 dBA.


  • For comparison, we found a 450 Watt PSU in our recent Steam Machine teardown. The Steam Machine's SilverStone power supply featured a "silent running 80 mm fan with 18 dBA minimum."


  • And a quick look at what's left on the behemoth of a heat sink: Heavy gauge, flat power cables run from the PSU to the logic board and graphics cards, and remain intertwined in the heat sink.


http://www.ifixit.com/Teardown/Mac+Pro+Late+2013+Teardown/20778#s56812


Real world numbers:


" I quit FurMark and kept the FCP render going, which brought system power down from ~380W to ~326W."


http://forums.macrumors.com/showthread.php?t=1692536&page=7

Jan 11, 2014 2:28 PM in response to The hatter

I've seen that teardown and that's why this is all very strange to me. And I can't seem to find some proper system-wide stress tests for this machine anywhere, with proper records of temperatures, performance and throttling (i.e. push the cpu to full load, and then see how it performs when the gpus are also in full load, etc).


Or even tests against a regular machine with the proper power and the same components (the cpu and the 7970/280x gpus, which do appear as d700s in mavericks)

Jan 11, 2014 2:18 PM in response to Kappy

I'd like to think this is a pro-grade workstation, so the

"in any typical use one would unlikely have the CPUs and the GPUs all maxed out at the same time."

statement is not something i was hoping to see here.


And those spikes you mention aren't going to happen because of throttling. I mean, even a high-end 620W psu, for example, only handles 700W spikes, and only for a short time. And this isn't a small form factor one like the one in the mac pro 2013.

Jan 11, 2014 2:36 PM in response to Kappy

That's not something I even worry about because throttling has everything under control here. Honestly, I knew this would happen the minute I read the announcement back in H1 2013.


Anyway, I've messaged someone who could get their hands on one of these and a system with the same specs and proper power+cooling, just to see exactly how much this machine throttles and if it's actually the case where a lower-spec mac pro has the same or similar power without throttling.


I've yet to come across some response from Apple regarding this issue.


And to avoid confusion for anyone who won't read further into that steam machine's power rating, that one fits well with the components it has. A single nvidia card that eats up ~250W max, and a ~80W standard quadcore, plus the rest of the system which isn't more than ~80-100W, and extra headroom, and I'm even being conservative with these numbers.

Jan 11, 2014 2:50 PM in response to The hatter

Almost off-topic, but here goes.


And AMD throttling? On that monstrosity of a card? Yes, that is exactly what happens when proper cooling isn't used (which isn't entirely the case with the mac pro, because it doesn't get hot enough because enough power isn't provided to the cards). The 290x throttles right at the danger temperature (94-95 celsius) and remains below it. And this happens with the reference blower cooler system, which is a joke. See reviews for the proper 290x cards that came out in december with bigger proper cooling. They even blow Titan/780Ti out of the water, especially taking price and performance into account, not to mention the better OpenCL performance.

Jan 11, 2014 3:57 PM in response to Martin Pace

tonymacx86.com/graphics/115593-amd-radeon-hd-7970-shows-firepro-d700-10-9-maveri cks.html


amd.com/us/products/workstation/graphics/ati-firepro-3d/w9000/Pages/w9000.aspx#2


amd.com/us/products/desktop/graphics/7000/7970/Pages/radeon-7970.aspx#3


All of them, the same chip, basically. 280x, 7970, "D700" and the w9000. Same bandwidth, same shader count, etc. Thing is, the one in the mac is crippled by hardware design, so it's not even getting all of its power to begin with. I even see a power spec of 275W there.


And I can't find the D700, specifically, on the amd site, except for one press release. There is no spec sheet for it, but it is clearly a 28 nm Tahiti core released in 2012 as the 7970, and renamed as the 280x in 2013.


Some might argue that this isn't the same "card", but the core still is the same and it's clearly not able to get enough amps to run at full potential.

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Mac Pro 2013 power rating

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