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Tutorial: Power Target limit hardware mod (Shunt mod) for Titan X and many other Nvidia GPUs - Page 20

post #191 of 299
Thanks man. Really love not having to worry about power anymore!
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post #192 of 299
For 1080 Ti, Looks like with a hybrid cooler, the VRMs hover around and below 70C. So I think 350 Watts - 375 Watts would be fine. Any opinions from others?




http://www.gamersnexus.net/guides/2841-gtx-1080-ti-hybrid-benchmarks-remove-thermal-limit/page-2

VRM can go up to 150C

http://www.mouser.com/ds/2/149/FDPC8016S-372149.pdf
Edited by SlimJ87D - 4/16/17 at 10:49am
post #193 of 299
I'd have no problems with pulling 400w from it if VRMs are only 70c. FE PCB is solid.
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post #194 of 299
Quote:
Originally Posted by prelude514 View Post

I'd have no problems with pulling 400w from it if VRMs are only 70c. FE PCB is solid.

Yeah, if they are 70C at 300 Watts then at 400 Watts they might be 93C to 100C. You can always increase your blower fan also to 50% and keep them even lower. I am going to add a bunch of heatsinks to the midplate so the midplate stays cooler.

I need to watch the whole video more carefully, but Gamers Nexus says the card should be safe to pull 400 Amps if you could cool VRMs. I don't remember how to calculate power from mosfets delivering 400 amps and 40 watts each. How many VRMs are there?
Edited by SlimJ87D - 4/16/17 at 11:14am
post #195 of 299
Quote:
Originally Posted by prelude514 View Post

I'd have no problems with pulling 400w from it if VRMs are only 70c. FE PCB is solid.
Wouldn't 400 W cause an issue with 6+8pin FE? Its safe power pull limit is 300W =75+75+150
post #196 of 299
Quote:
Originally Posted by PeterOC View Post

Wouldn't 400 W cause an issue with 6+8pin FE? Its safe power pull limit is 300W =75+75+150

I don't think so.

If you think about it, GPUs always come with adapters, at least many do, to adapt 6-pin to 8-pin.

There's an article out there about shunt modding the 1080 Ti that talks more about it. I'll find it later.
post #197 of 299
Quote:
Originally Posted by SlimJ87D View Post

Quote:
Originally Posted by Jbravo33 View Post

how to test? I will check. school me. haha I need to know too before I burn this thing to the ground.

There's an nvidia command you type but I'm not sure it'll work because I think it relies on your cards power percent reading.

For you, it might say 150 watts because you're at 50%.

http://www.overclock.net/t/1624521/nvidia-gtx-1080-ti-owners-club/4680#post_26003001

Please test this while running a benchmark in window mode on the side. We'll get to see how the shunt mod works.
are the numbers in hwmonitor accurate like these? Figuring it's polling the same sensors that these do...?
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post #198 of 299
Quote:
Originally Posted by SlimJ87D View Post

I don't think so.

If you think about it, GPUs always come with adapters, at least many do, to adapt 6-pin to 8-pin.

There's an article out there about shunt modding the 1080 Ti that talks more about it. I'll find it later.

I'd love to have a read on that. Not sure what you mean though. The input power pins to GPU are set, so you can't override 6+8 pin and thus max power as far as I see it. Unless this is another mod smile.gif.
post #199 of 299
Quote:
Originally Posted by PeterOC View Post

I'd love to have a read on that. Not sure what you mean though. The input power pins to GPU are set, so you can't override 6+8 pin and thus max power as far as I see it. Unless this is another mod smile.gif.

Look up the shunt mod.

From my understanding the PSU will give whatever current a device asks it up to a certain limit, and those are high limits.

A MSI 1080 Ti can draw 150 Watts from a 6-pin of a PSU if you use an adapter. So being 6-pin from the PSU doesn't stop it.

The shunt mod tricks the card into thinking it's drawing in less power and allows for you to draw more power out of the 8+6 pins.

Originally on Maxwell cards, you could modify the bios and actually increase the amount of current the 8 and 6 pins were allowed to draw. We do not have unlocked bios and this luxury on pascal cards anymore. That's why we are trying to find bios that have been written to draw more than 300 Watts. But so far it hasn't worked out that well. It seems the bios are written specifically for the hardware that's present on the card.

Hence, shunt mod has become the go to method to get more power.
post #200 of 299
Quote:
Originally Posted by SlimJ87D View Post

Look up the shunt mod.

From my understanding the PSU will give whatever current a device asks it up to a certain limit, and those are high limits.

A MSI 1080 Ti can draw 150 Watts from a 6-pin of a PSU if you use an adapter. So being 6-pin from the PSU doesn't stop it.

The shunt mod tricks the card into thinking it's drawing in less power and allows for you to draw more power out of the 8+6 pins.

Originally on Maxwell cards, you could modify the bios and actually increase the amount of current the 8 and 6 pins were allowed to draw. We do not have unlocked bios and this luxury on pascal cards anymore. That's why we are trying to find bios that have been written to draw more than 300 Watts. But so far it hasn't worked out that well. It seems the bios are written specifically for the hardware that's present on the card.

Hence, shunt mod has become the go to method to get more power.

Shunt mod lets card pull more, but the question is how safe and to what extent it is safe to pull more than 300 W from an 8+6 pin config. My understanding is that recommended power draw limits are 75W for PCIE, 75W for 6pin and 150W for 8pin.
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