NVIDIA Announces GP102-based TITAN X with 3,584 CUDA cores

[Draeconis]

When I had a 5,1 Mac Pro, I had a GTX780 with an EFI Mac Firmware, which allowed the usage of 2 pins of power without any mods, and also using PCIe 2x lanes.

I meant Firmware update for the Titan X (ie what MacVidCards does).

Do you know the wattage that comes out of those 2 pins from the 5,1 cMP? If enough, then maybe someone can make a 4+4pin adapter.

Ah ok, understand what you mean now.

I don't know what he does, apart from allowing boot screens and PCIe 2.0 support. If he's created firmware to allow a Titan X to safely run from 2 6-pin, then he's down-clocking the card with the firmware. As has been stated many times by many people, as is, the Mac Pro can support up to 225w; 75 from the PCIe slot, and 75w from each 6-pin power cable.

At 250w, the stock Titan X (or 980 TI) pulls too much, and as such has power connectors on the card to match.

Some enterprising people install an additional PSU, or even mod the existing PSU to provide more power.

The reason it's such a huge PSU, is that it's designed to potentially power two powerful CPUs, up to 2x 5770s or 1x 5870, and everything else that the machine can run (2 optical disk drives, four hard disk drives, PCIe expansion, USB bus power, FireWire bus power, fans etc.

If you want to go beyond this spec, that's possible, but not without additional supplemental power or some rather serious electrical engineering.

 

[Shamgar]

At 250w, the stock Titan X (or 980 TI) pulls too much, and as such has power connectors on the card to match.

The 225 watt power limit in the cMP and the 250 watt TDPs on various GPUs are not hard numbers, but design specs. For example, the 780 Ti and 980 Ti both have a 250 watt TDP, but the 980 Ti will remain within the practical power limits of a cMP at stock speeds. The 780 Ti will not and tends to force shutdowns under load.

It's possible that this new Titan X will run in a cMP without additional power like the current Titan X, even though it's TDP exceeds the design spec of the power delivery. Not necessarily recommended if so, but possible.

 

[benjaprud]

I used a Maxwell Titan X for a few months on a 6 to 8 pin adapter and it worked like a charm even fully overclocked and at 110% TDP limit, furmark and all. I still modified my PSU (soldering another 8 pin supply from the 12V rail on the PSU) because the PCI and PSU fan speeds are bound to the power consumption on the 6 pin supplies, which made the thing quite noisy under load (1750/2250 RPM PSU/PCI with overclocking).

Somebody here pointed out that some safety circuits will shut down the power supply if the current exceeds 10 Amps (around 120 Watts) on one of the 6 pin supplies to protect the motherboard traces. In the end it comes down to how the power consumption is balanced between the connectors. If the card pulls more than 10 Amps on its 8 pin supply then it's a no go. The 780Ti was known to be able to shut down the power supply at full load, but so far I've never seen anybody complain about that on Titan X/980Ti.

There are good chances that the Pascal Titan X will work with a 6 to 8 pin adapter, but still some guys have to try it first. It might need a PSU mod and from my experience the mod is recommended if you don't want to turn your mac into a boeing turbine.

Now let's hope for those Pascal drivers.

 

[h9826790]

Ah ok, understand what you mean now.

I don't know what he does, apart from allowing boot screens and PCIe 2.0 support. If he's created firmware to allow a Titan X to safely run from 2 6-pin, then he's down-clocking the card with the firmware. As has been stated many times by many people, as is, the Mac Pro can support up to 225w; 75 from the PCIe slot, and 75w from each 6-pin power cable.

At 250w, the stock Titan X (or 980 TI) pulls too much, and as such has power connectors on the card to match.

Some enterprising people install an additional PSU, or even mod the existing PSU to provide more power.

The reason it's such a huge PSU, is that it's designed to potentially power two powerful CPUs, up to 2x 5770s or 1x 5870, and everything else that the machine can run (2 optical disk drives, four hard disk drives, PCIe expansion, USB bus power, FireWire bus power, fans etc.

If you want to go beyond this spec, that's possible, but not without additional supplemental power or some rather serious electrical engineering.

It's possible to go beyond this limit without any mod.

https://forums.macrumors.com/thread...or-approaching-silence.1982499/#post-23120938

I am not recommending anyone to do this, but the test shows it's possible. And I run in this config for more than a year now. No problem at all.

If I can run 2x space heater via the 6pins only, sure that's enough juice for the TitanX. The real challenge is how to evenly distribute the power draw. And keep each 6pin below the shutdown limit (about 120W).

I used a Maxwell Titan X for a few months on a 6 to 8 pin adapter and it worked like a charm even fully overclocked and at 110% TDP limit, furmark and all. I still modified my PSU (soldering another 8 pin supply from the 12V rail on the PSU) because the PCI and PSU fan speeds are bound to the power consumption on the 6 pin supplies, which made the thing quite noisy under load (1750/2250 RPM PSU/PCI with overclocking).

Somebody here pointed out that some safety circuits will shut down the power supply if the current exceeds 10 Amps (around 120 Watts) on one of the 6 pin supplies to protect the motherboard traces. In the end it comes down to how the power consumption is balanced between the connectors. The 780Ti was known to be able to shut down the power supply at full load, but so far I've never seen somebody complain about that on Titan X/980Ti.

There are good chances that the Pascal Titan X will work with a 6 to 8 pin adapter, but still some guys have to try it first. It might need a PSU mod and from my experience the mod is recommended if you don't want to turn your mac into a boeing turbine.

Now let's hope for those Pascal drivers.

You can use MacsFanControl to manually make a PCIe (and PSU) fan profile base on the temperature.

e.g. PCIe fan base on PCIe ambient temperature, and only spin up when PCIe ambient above 40C, so that it will not affect the cooling of your card. And it won't create too much unnecessary nosie purely base on the power draw.

The PSU can also base on PSU component 2's temperature. So that it won't go crazy when the 6pins are under stress.

 

[William_si]

A 290W TDP card (R9 290X) seems to work for me, a R9 295X/395X (dual 290X) with 500W TDP (3 8pin) shuts down the Mac once bench starts. A GP102 Titan X could (should?) work thus.