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[Official] Nvidia GTX 980 Ti Owners Club - Page 1405

post #14041 of 16147
Quote:
Originally Posted by Ithanul View Post

Yeah, I have never dared to run just one cable per card. Always used two cables per card. Thought of only one cable per card never seem like a good idea with something that could pull some serious watts at full load.

Quote:
Originally Posted by sblantipodi View Post


Are you serious? Four cables for a SLI?
I'm running two EVGA GTX980Ti SuperClocked and than and I start Afterburner and
I raise the power limit to 110%
core clock to +100MHz
and Memory clock to +300MHz

This results in a mild overclock, 1400MHz on the gpus.
How can a simple overclock like this could require four cables?

Really, only running a single cable per card would just cause it to under perform or crash outright. My HTPC has a GTX 760 in it that's overclocked out of the box and I don't like using a single cable on it but that's all the PSU that's in that machine has. Even it power throttles occasionally, mostly when I play GTA 5 or The Witcher 3 on it.
 
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post #14042 of 16147
Quote:
Originally Posted by sblantipodi View Post


Are you serious? Four cables for a SLI?

How can a simple overclock like this could require four cables?
What did you expect honestly? You have two GPU's that need a total of four cables. Specifically two 8+6 pin,that's rated for up to 300W per card including the PCI Express.

You simply can not run 600W worth of power on a daisy chain. My G1 easily reaches 300W at 1400 MHz.

Your PSU can have 6 PCI express cables so do yourself a favour and run four separate cables like it is supposed to be.
post #14043 of 16147
Quote:
Originally Posted by sblantipodi View Post


Are you serious? Four cables for a SLI?
I'm running two EVGA GTX980Ti SuperClocked and than and I start Afterburner and
I raise the power limit to 110%
core clock to +100MHz
and Memory clock to +300MHz

This results in a mild overclock, 1400MHz on the gpus.
How can a simple overclock like this could require four cables?

I'm amazed you're stable with any overclock with your current setup anyways.

Your max TDP's are as follows:
CPU - 140w
GPU x2 - 500w
H80i - 5w
HDD - ~11w
SSD x 2- ~2w
M.2 - 7w
Plus other peripherals = roughly 665w without overclocking anything

OC CPU (Just Turbo boost) Guru 3D reports it at 187w
GPU x 2 w/ 10% OC - 550w


If you OC your CPU manually it it most likely pulling more than 187w, probably over 200w. But I'll say conservatively 200w is what you are pulling, so your rough total under load is 775w. Your PSU has a 89% efficiency at full load so you really should only be able to use 765.4w at full load (If you are pulling 860w at the wall). You are already close to max load on your PSU and if your PSU has a multi 12v rail system and you are pulling most of it on a single rail then you would do very well to just take the time to run 2 more cables and use 2 cables per GPU. Also maybe go up a step in PSU if / when you could afford it.

TL/DR: with a 89% efficiency and OC on both GPU's and CPU then the total load of the system under 100% load would be ~775w, the PSU being used can only supply 765.4w at full load. The PSU is not large enough for 2 OC GPU's, an OC 5930k using an AIO water cooler. A larger PSU is needed but more importantly the GPU's need 2 cables per card immediately.
Edited by Artifesto - 8/29/16 at 12:12pm
 
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post #14044 of 16147
Quote:
Originally Posted by GoLDii3 View Post

What did you expect honestly? You have two GPU's that need a total of four cables. Specifically two 8+6 pin,that's rated for up to 300W per card including the PCI Express.

You simply can not run 600W worth of power on a daisy chain. My G1 easily reaches 300W at 1400 MHz.

Your PSU can have 6 PCI express cables so do yourself a favour and run four separate cables like it is supposed to be.

Corsair link software put 40amp (480w) limit on a single cable.
What you are saying is probably true with cheap PSUs but I will try.
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post #14045 of 16147
Quote:
Originally Posted by Artifesto View Post

I'm amazed you're stable with any overclock with your current setup anyways.

Your max TDP's are as follows:
CPU - 140w
GPU x2 - 500w
H80i - 5w
HDD - ~11w
SSD x 2- ~2w
M.2 - 7w
Plus other peripherals = roughly 665w without overclocking anything

OC CPU (Just Turbo boost) Guru 3D reports it at 187w
GPU x 2 w/ 10% OC - 550w


If you OC your CPU manually it it most likely pulling more than 187w, probably over 200w. But I'll say conservatively 200w is what you are pulling, so your rough total under load is 775w. Your PSU has a 89% efficiency at full load so you really should only be able to use 765.4w at full load (If you are pulling 860w at the wall). You are already close to max load on your PSU and if your PSU has a multi 12v rail system and you are pulling most of it on a single rail then you would do very well to just take the time to run 2 more cables and use 2 cables per GPU. Also maybe go up a step in PSU if / when you could afford it.

TL/DR: with a 89% efficiency and OC on both GPU's and CPU then the total load of the system under 100% load would be ~775w, the PSU being used can only supply 765.4w at full load. The PSU is not large enough for 2 OC GPU's, an OC 5930k using an AIO water cooler. A larger PSU is needed but more importantly the GPU's need 2 cables per card immediately.

AX860i is the best PSU on the market. no problem in using at 100℅ of its capacity and I no where near in tapping out its capacity.
The ax860i can supply 1000w at full load but is guaranteed for 860w not at the wall but at load

I will try the two cables per card
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post #14046 of 16147
Quote:
Originally Posted by sblantipodi View Post

AX860i is the best PSU on the market. no problem in using at 100℅ of its capacity and I no where near in tapping out its capacity.

I will try the two cables per card

Look guy, what's best on the market is a matter of opinion. I'm telling you a FACT that CORSAIR listed the efficiency of your PSU at 100% load as being 89%. There does not exist a PSU that has a 100% efficiency, every PSU loses wattage converting AC to DC and stepping it down to the required voltages.
Here is the link to Corsair's article for your reference, electricity is my job, understanding how it works is what I do every day. 89% of 860 is 765.4, no questions about it. It does not change, you cannot utilize every advertised watt of your PSU. It is impossible, 860w at the wall does not translate to 860w available inside your machine. My PSU is only 80 Plus Gold, at 100% load I have an efficiency level of 87% therefore I only have 739w of available power to my components.

You cannot argue with math and the rules of electricity, your best bet is to add the additional cables and to move up to a larger PSU ASAP, otherwise you run the risk of damaging your components.

You also can't argue what the TDP's of your components are, my 4790k at full load pulls 120w. My 980 Ti at full load pulls 375w. That's 495w, 157w higher than advertised. My CPU is not overclocked, I took my time and went through and researched the TDP's of each of your components in your signature. I did the math, and posted it for you to see. You can argue about how much power you think you use but you can't change math and how electricity works.
Edited by Artifesto - 8/29/16 at 1:18pm
 
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post #14047 of 16147
It's not uncommon that good PSUs can actually sustain a larger load than advertised. Cheap no-name PSUs on the other hand might rather do the opposite and already fail at half the promised wattage.
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post #14048 of 16147
Quote:
Originally Posted by sblantipodi View Post

Warning: Spoiler! (Click to show)
Quote:
Originally Posted by looniam View Post

when it comes to SLI/PSU related problems:

1) PSU not enough.
2) PSU has multi rail 12v and too much on one rail
3) using a single cable with daisy chain 6/8 pin power connections to each card.

we know it's not 1 or 2 but how about 3? feeding a card more than 250 watts through a single cable can get sketchy.

I'm using one cable per card

theoretically one cable should be fine BUT i have seen folks have issues with games crashing, blue screens and reboots until they used two cables per card.

those terminals that plug into the pins on the PSU ought to be rated @11amps and 18awg wire can carry up to ~100 watts (esp under a meter) so in theory those three 12v wires ought to be able to give ~300 watts combined BUT it doesn't always work out that way. i know folks love the cable management on 1 cable per card so just run another each temporarily. if the issues goes away . .well place them to your liking then.

btw, i went to get what info i could looking at your post history. you sure that asus power surge error is corrected?
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post #14049 of 16147
Quote:
Originally Posted by BrainSplatter View Post

It's not uncommon that good PSUs can actually sustain a larger load than advertised. Cheap no-name PSUs on the other hand might rather do the opposite and already fail at half the promised wattage.

But why take a chance to begin with? The ratings are there for a reason and the chance of damage or instability is much higher when operating above the rated specs.
 
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post #14050 of 16147
Quote:
Originally Posted by Artifesto View Post

Warning: Spoiler! (Click to show)
I'm amazed you're stable with any overclock with your current setup anyways.

Your max TDP's are as follows:
CPU - 140w
GPU x2 - 500w
H80i - 5w
HDD - ~11w
SSD x 2- ~2w
M.2 - 7w
Plus other peripherals = roughly 665w without overclocking anything

OC CPU (Just Turbo boost) Guru 3D reports it at 187w
GPU x 2 w/ 10% OC - 550w


If you OC your CPU manually it it most likely pulling more than 187w, probably over 200w. But I'll say conservatively 200w is what you are pulling, so your rough total under load is 775w. Your PSU has a 89% efficiency at full load so you really should only be able to use 765.4w at full load (If you are pulling 860w at the wall). You are already close to max load on your PSU and if your PSU has a multi 12v rail system and you are pulling most of it on a single rail then you would do very well to just take the time to run 2 more cables and use 2 cables per GPU. Also maybe go up a step in PSU if / when you could afford it.

TL/DR: with a 89% efficiency and OC on both GPU's and CPU then the total load of the system under 100% load would be ~775w, the PSU being used can only supply 765.4w at full load. The PSU is not large enough for 2 OC GPU's, an OC 5930k using an AIO water cooler. A larger PSU is needed but more importantly the GPU's need 2 cables per card immediately.

Quote:
Originally Posted by Artifesto View Post

Warning: Spoiler! (Click to show)

Look guy, what's best on the market is a matter of opinion. I'm telling you a FACT that CORSAIR listed the efficiency of your PSU at 100% load as being 89%. There does not exist a PSU that has a 100% efficiency, every PSU loses wattage converting AC to DC and stepping it down to the required voltages.
Here is the link to Corsair's article for your reference, electricity is my job, understanding how it works is what I do every day. 89% of 860 is 765.4, no questions about it. It does not change, you cannot utilize every advertised watt of your PSU. It is impossible, 860w at the wall does not translate to 860w available inside your machine. My PSU is only 80 Plus Gold, at 100% load I have an efficiency level of 87% therefore I only have 739w of available power to my components.

You cannot argue with math and the rules of electricity, your best bet is to add the additional cables and to move up to a larger PSU ASAP, otherwise you run the risk of damaging your components.

You also can't argue what the TDP's of your components are, my 4790k at full load pulls 120w. My 980 Ti at full load pulls 375w. That's 495w, 157w higher than advertised. My CPU is not overclocked, I took my time and went through and researched the TDP's of each of your components in your signature. I did the math, and posted it for you to see. You can argue about how much power you think you use but you can't change math and how electricity works.

woah there partner!

an 860 watt PSU will provide 860 watts; it just takes 988.5 watts from the wall to do it @87% efficiency . (860/.87)

that corsair 860AXi is actually a bit better @958 watts from the wall @~90%.
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story3&reid=317
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SB Recon3D Klipsch ProMedia 2.1  
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loon 3.2
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i7-3770K Asus P8Z77-V Pro EVGA 980TI SC+ 16Gb PNY ddr3 1866 
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PNY 1311 240Gb 1 TB Seagate 3 TB WD Blue DVD DVDRW+/- 
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EKWB P280 kit EK-VGA supremacy Win X LG 24MC57HQ-P 
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Ducky Zero [blues] EVGA SuperNova 750 G2 Stryker M [hammered and drilled] corsair M65 
AudioAudio
SB Recon3D Klipsch ProMedia 2.1  
  hide details  
Reply
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