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[Official] NVIDIA GTX 780 Ti Owner's Club - Page 928

post #9271 of 16495
Quote:
Originally Posted by gordan View Post

That depends on your PSU. If the rail in the PSU can handle it safely without overloading, then yes, it's safe. For example, my CoolerMaster M2 1500 comes with 6-pin modular plugs for all GPU PCIe aux. power, and each cable has an 8-pin plus a modular 6+2 pin connector on it, implying that it is safe to run two 8-pins off a single modular cable. 8-pin connectors are rated for 150W, so that output must be able to handle at least 300W.

I run my 780Ti (modified BIOS with 300W limit, 120% of standard) and my Titan (modified BIOS with 350W limit, 140% of standard) in such a setup without any problems.
It's a Cooleraster V850, it has 840W on the 12V so I'm guessing it's ok too, thanks!
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post #9272 of 16495
Quote:
Originally Posted by Camberwell View Post

It's a Cooleraster V850, it has 840W on the 12V so I'm guessing it's ok too, thanks!

There is most likely more than one 12V rail, and the combined total between all rails will be 840W. It also matters what else is hooked up to the rail you are using for the GPU. My CM M2 1500 has 1440W on 12V combined, but there are only two 12V rails, which means you don't have to worry about it too much. The V850 might have more rails, which would mean you can pull less from any one rail. The problem is that it's poorly documented what rail different looms/ports are on.

In practice, though, the PSU should shut down when it hits over-current protection or overheats (either/both will happen if you are pulling too much from a rail that can't handle it).

So you'll probably be OK, but it's not guaranteed. Once you start pushing beyond what the connector is official specced for all bets are off.
post #9273 of 16495
Quote:
Originally Posted by gordan View Post

There is most likely more than one 12V rail, and the combined total between all rails will be 840W. It also matters what else is hooked up to the rail you are using for the GPU. My CM M2 1500 has 1440W on 12V combined, but there are only two 12V rails, which means you don't have to worry about it too much. The V850 might have more rails, which would mean you can pull less from any one rail. The problem is that it's poorly documented what rail different looms/ports are on.

In practice, though, the PSU should shut down when it hits over-current protection or overheats (either/both will happen if you are pulling too much from a rail that can't handle it).

So you'll probably be OK, but it's not guaranteed. Once you start pushing beyond what the connector is official specced for all bets are off.

V850 has a single 12v rail
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post #9274 of 16495
Quote:
Originally Posted by Camberwell View Post

Thanks, but I'm not sure you understood my question (or I don't get the answer wink.gif ). Is it safe to use one pci-e cable with 2 pci-e connectors on it to power my Ti, or should I use 2 seperate pci-e cables? I only need one cpu cable so for me that is not an issue....

Yes i did understand! wink.gif The PSU is single rail, meaning it shares all amperage in those 3 PCIe 12V lines, so, you use 1 PCIe cable for your card (1 PCIe cable has 2 connectors) you only use 2 PCIe cables when OCing in Multi-Rail PSU's because normally multi rail is amperage limited (20, 25,30A etc) and that limits the current going to your card!
So, yes it is safe to use 1 PCIe cable with your card with the Coolermaster V850! thumb.gif

Quote:
Originally Posted by gordan View Post

There is most likely more than one 12V rail, and the combined total between all rails will be 840W. It also matters what else is hooked up to the rail you are using for the GPU. My CM M2 1500 has 1440W on 12V combined, but there are only two 12V rails, which means you don't have to worry about it too much. The V850 might have more rails, which would mean you can pull less from any one rail. The problem is that it's poorly documented what rail different looms/ports are on.

In practice, though, the PSU should shut down when it hits over-current protection or overheats (either/both will happen if you are pulling too much from a rail that can't handle it).

So you'll probably be OK, but it's not guaranteed. Once you start pushing beyond what the connector is official specced for all bets are off.

You should read a bit more or ask about PSU's to people that know what they talk about like my Friend shilka, who is our OCN PSU resident guru!, its a known (and documented) PSU and a good one, SINGLE RAIL based on Seasonic KM3 platform!
And now a word of advice: You said my Brother's bios is BOGUS! A newbie like you with 8 posts and 0 rep coming here to OCN and slander our Bios Modder as BOGUS?
With thousands of happy users and you come here and say that? and now post a supposedly modded bios by yourself and hope everyone takes you seriously? Really?
If you want to come her to OCN and be part of a great community, first you have to respect people and not being arrogant to the point of offending others work, that is not the right way to integrate yourself here or anywhere actually!

Quote:
Originally Posted by shilka View Post

V850 has a single 12v rail

Hey buddy! How's things going! Busy with the benches? wink.gif


Cheers

Ed

(Team skyn3t)
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post #9275 of 16495
Quote:
Originally Posted by OccamRazor View Post

Hey buddy! How's things going! Busy with the benches? wink.gif


Cheers

Ed

(Team skyn3t)

I have not gotten the cards yet so no

As i said it wont be untill early-mid april before i get them
Edited by shilka - 3/27/14 at 5:39am
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post #9276 of 16495
MSI afterburner 3.0 beta 19 out today. Downloading now to see if it changed anything with 780ti voltage. I doubt it, but it's worth a try. thumb.gif
http://www.guru3d.com/files_details/msi_afterburner_beta_download.html
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post #9277 of 16495
.
.


what a coincidence !

i was asking the same question yesterday about the using one pci-e cable with 2 pci-e connectors on it to power my Ti because i'm planning on sleeving my Seasonic X-850 ( which is the exact same as CM V850 ) as i understand

http://www.overclock.net/t/1262900/frequently-asked-sleeving-questions/800#post_22011923


but i'm planning to getting rid of the additional contactor for better sleeving look



Thanks everyone for your info !
post #9278 of 16495
Thread Starter 
Quote:
Originally Posted by gordan View Post

I'm pretty sure the fan speed unlock on the skyn3t BIOS, at least for the EVGA SC ACX, is bogus/broken.
Yes, you can drag the slider up to 100% in EVGA Precision X
No, it doesn't increase the maximum fan RPM

With the stock BIOS I get about 3500 RPM @ 85%
With the modified BIOS I get about 3500 RPM@100% and about 3000 RPM @ 85%

So all the fan unlocking does is change the label, it doesn't change the actual maximum voltage applied to the fan.

It also changes labels on the TDP, but not the actual TDP.
With the stock BIOS my card stabilizes at 92C while mining with fan at maximum, TDP@100% PerfCap by power limit according to GPU-Z.
With the skyn3t BIOS the card stabilizes at 92C while mining with fan at maximum, TDP@100%, PerfCap not listed in GPU-Z.

The performance also doesn't change so I am quiet certain that the skyn3t BIOS is completely bogus and doesn't do anything at all useful at all. All it does is remove the boost clocks so the card never clocks up to 1076MHz.

What we really need is an engineering BIOS for the 780Ti, like the one available here for the Titan:
http://forum.hwbot.org/showthread.php?t=71489

The said Titan BIOS won't work as is because you would need to change the RAM size and timings, as described by Raim here:
http://www.eevblog.com/forum/chat/hacking-nvidia-cards-into-their-professional-counterparts/msg406006/#msg406006

It would also require changing the voltage table to gain significant benefit because Titan is based on earlier silicon which isn't as good, and requires somewhat higher voltages (more RAM probably also means the memory controller needs more power, which is at least a part of the reason for the higher GPU voltages)

It would probably be worth it, though - my Titan with the engineering BIOS can run the fan at ~4100rpm, whereas the 780Ti tops out at 3500rpm, both with the reference cooler. While it is plausible the fan motor is different, I'm not entirely convinced that is what is behind the rpm difference.


You took too much time to write all this above. But you are

Gordan vs The world = you loose the only thing bogus here is you. Why not take your time to help and not to bash ppl like you always going to come and the best thing to do is ignoring it.

I just replay to this in order to give another example.

My best to you and make sure you don't cook your GPU components over time the time. This is what happen to everyone that mine under Air. " my last line above is helpful " why not you do the same.

wink.gif
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post #9279 of 16495
Am I reading that right? Someone is saying it's ok to flash a Ti to a Titan BIOS?

I can think of more reasons why you shouldn't do that than I can count on both hands and feet, but ok. The biggest clue is if you put both cards side by side, and then use your eyes.

If your brain isn't telling you just by looking at the PCBs that it's a bad idea, you shouldn't be allowed to flash GPUS biggrin.gif
post #9280 of 16495
Quote:
Originally Posted by skyn3t View Post

You took too much time to write all this above. But you are

Gordan vs The world = you loose the only thing bogus here is you. Why not take your time to help and not to bash ppl like you always going to come and the best thing to do is ignoring it.

I just replay to this in order to give another example.

My best to you and make sure you don't cook your GPU components over time the time. This is what happen to everyone that mine under Air. " my last line above is helpful " why not you do the same.

wink.gif

Show me the evidence. I pointed out what my conclusions are based on.
As for helpfulness, I posted my modified BIOS that actually achieves a meaningful improvement AND lowers running temperatures by undervolting. Other BIOSes under the same load will run a lot hotter and/or slower.

The only caveat is that it is stability tested on my cards - and since all silicon is not the same when it leaves the factory the undervolt (5 notches) may be too far for some cards.

The only other thing I still need to figure out is where the absolute maximum fan PWM is stored to get the rpm on the 780Ti up to 5200 rpm. I'll probably start with the Titan engineering BIOS, get the memory size adjusted, and take it from there.
Edited by gordan - 3/27/14 at 7:12am
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