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NVIDIA GTX 1080 Ti Owner's Club - Page 969

post #9681 of 10455
Quote:
Originally Posted by BrainSplatter View Post

I am running 2x FE 1080ti SLI + 7700K on a 800W BeQuiet Straight Power PSU with no problems so far. I did all the 3DMark benches and superposition 4k/8k with OC + maxed out power target and the CPU @ 5.1Ghz@1.4v. I was a bit nervous but everything worked just fine. System has 32GB RAM, 6xSSDs and 9 fans. Unfortunately, I can't measure power draw on the outlet because the battery in my Kill-A-Watt is dead.

I wouldn't recommend a 800W PSU for SLI 1080Ti but it can work, lol. An overclocked 6 core CPU might already push the system over the edge though.


Regarding FPS gains in games after switching from old AMD CPU to 7700K. Witcher 3 is not really a good test. One of the best tests would be a Total War game like Attila or TW-Warhammer since it's highly dependent on single CPU core performance. Arma 3 I think can also be pretty limited by a single core.
i am NOT sure how you are pulling that off! I know systems are different, but, i am pulling spikes to 400w on the Aorus. So , two of them max clocked would spike to 800w by themselves. then another 120w for the cpu, that's 920w... NOT counting ssds, ddr4s, mobo, hard drive, fans, any lighting, and the psu itself. HAS to be spiking at 1000w + with a fully overclocked system. Being as how psu's are rated , say, 1000w... that means they can handle 1000w spikes, but they cannot handle 1000w constant. Psu shouldnt be run at 80 or 90% load, even if they can do it. It will degrade and cause problems eventually. Yeah, it's warrantied, but if you drive a psu "until the wheels fall off" it takes your entire system with you. On a single Ti, 850 + works but I'd recommend 1000w. On a SLI set-up... brruh. 1200w + ONLY imo. For longevity. For a power overhead. Having power overhead is a critical part of system balance imo. Im a 1000w on single Ti and people laugh and say , "overkill" all the time. SLI owners on 1500w hear the same thing. But, you don't see threads about "Crashing in Witcher 3..." from guys with power overhead....

Regarding FPS gains in games after switching from old AMD CPU to 7700K. Witcher 3 is not really a good test. One of the best tests would be a Total War game like Attila or TW-Warhammer since it's highly dependent on single CPU core performance. Arma 3 I think can also be pretty limited by a single core.]


YEP! I told him before he got off the FX to do an Arma 3 comparison. It has a bad cpu bind.
Edited by Slackaveli - 5/15/17 at 7:35am
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post #9682 of 10455
Quote:
Originally Posted by Slackaveli View Post

i am NOT sure how you are pulling that off! I know systems are different, but, i am pulling spikes to 400w on the Aorus. So , two of them max clocked would spike to 800w by themselves. then another 120w for the cpu, that's 920w... NOT counting ssds, ddr4s, mobo, hard drive, fans, any lighting, and the psu itself. HAS to be spiking at 1000w + with a fully overclocked system. Being as how psu's are rated , say, 1000w... that means they can handle 1000w spikes, but they cannot handle 1000w constant. Psu shouldnt be run at 80 or 90% load, even if they can do it. It will degrade and cause problems eventually. Yeah, it's warrantied, but if you drive a psu "until the wheels fall off" it takes your entire system with you. On a single Ti, 850 + workks but I'd recommend 100w. On a SLI set-up... brruh. 1200w + ONLY imo. For longevity. For a power overhead. Having power overhead is a critical part of system balance imo. Im a 100w on single Ti and people laugh and say , "overkill" all the time. SLI owners on 1500w hear the same thing. But, you don't see threads about "Crashing in ..." from guys with power overhead....

Regarding FPS gains in games after switching from old AMD CPU to 7700K. Witcher 3 is not really a good test. One of the best tests would be a Total War game like Attila or TW-Warhammer since it's highly dependent on single CPU core performance. Arma 3 I think can also be pretty limited by a single core. YEP! I told him before he got off the FX to do an Arma 3 comparison. It has a bad cpu bind.

You pretty much answered your question by yourself... Spikes are pretty much spikes, neither the gpu is pulling constant max power nor the cpu is fully 100% loaded. this would only be the case if you do boinc and stuff on gpu and cpu... but thats another story... And PSU can be run at 80 or 90% load all the time, they are designed for that
    
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post #9683 of 10455
Quote:
Originally Posted by Dasboogieman View Post

What I also don't get is the price difference between a 750W PSU and a decent 1000W is peanuts compared to the benefits. Why are people cheaping out on the PSU?
EX-ACT-LY!!! They NEVER save the $100 for hyperthreading by buying the i-5. they never save the $100 by buying the "B" mobo. They never save the $100 by buying the off-brand ssd..... But, they WILL skimp on a psu... the one component that will bork your WHOLE rig when it fails!!! That's dumb af. But, when they try to shove that logic down the community's throat just so they can feel better about their dumb purchase, it becomes more than just dumb. I try to refute it whenever I see it!
Edited by Slackaveli - 5/15/17 at 7:36am
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post #9684 of 10455
Quote:
Originally Posted by Hulio225 View Post

You pretty much answered your question by yourself... Spikes are pretty much spikes, neither the gpu is pulling constant max power nor the cpu is fully 100% loaded. this would only be the case if you do boinc and stuff on gpu and cpu... but thats another story... And PSU can be run at 80 or 90% load all the time, they are designed for that
yeah, not by me they won't. My pops taught me 20 years ago (he is an electrical engineer) to never run any type of power supply / generator at over 75% load. It degrades the part and risks the system. If it was three times the cost to go big I could understand the urge to go cheap on the psu... but I'd rather go cheap on a mobo tbh than a psu. I want 25% headroom.

I am sure a GOOD 850 for a single would be "fine". 650w is just ASKING to nuke your system!
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post #9685 of 10455
Quote:
Originally Posted by Benny89 View Post

Of course I will try to OC, but you know biggrin.gif I won't be that obssessed about extra FPS with SLI biggrin.gifthumb.gif

My wife had enough of boxed in and out and GPUs lying around in home....

Ow well, will report when I get them

You were obsessed with trying to gain 1% FPS. Trust me, you'll be doing it again but now with both cards. tongue.gif
post #9686 of 10455
Too much headroom means you're reducing the efficiency of your PSU isn't it?
post #9687 of 10455
Quote:
Originally Posted by Slackaveli View Post

yeah, not by me they won't. My pops taught me 20 years ago (he is an electrical engineer) to never run any type of power supply / generator at over 75% load. It degrades the part and risks the system. If it was three times the cost to go big I could understand the urge to go cheap on the psu... but I'd rather go cheap on a mobo tbh than a psu. I want 25% headroom.

I am sure a GOOD 850 for a single would be "fine". 650w is just ASKING to nuke your system!

What coincidence i have an degree in electronics myself... while i'm aware of that 650W is somewhat skimpy, i had this already from my previous system... but the argument of degradadtion etc is a bit flawed, you could say the same about your gpu and cpu too, if loaded all the time it degrades because its getting warmer bla bla... 80-90% load on a modern quality psu is not an biggy, and im saying that as an electronic engineer ;-)
    
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post #9688 of 10455
Quote:
Originally Posted by Hulio225 View Post

To be honest recommending 1000w for a single gpu config is over the top...

My 650W PSU is enough for a shunt modded 1080ti and a i7 7700k both decently oc'ed... it depends how the psu power is distributed, if it has 650W on the 12V rail, like mine it is fine! for safety and a bit headroom i would recommend a 750w or max 850w for single gpu... and for 2 gpu setups 1200W will be enough too...
mine's a 1000w single rail, but, tbh... i am mad for not just getting the 1200 or 1500w corsair. because, why NOT? It means you can go sli at will or always have headroom, never stress the psu. oh well. But, like right now if i threw another Ti in my rig.. I'd not feel comfortable with only 1000w single rail.
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post #9689 of 10455
Quote:
Originally Posted by TheBoom View Post

Too much headroom means you're reducing the efficiency of your PSU isn't it?

Yes. And 750 watt PSU is more than fine for a single Ti, just get a high quality one.
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post #9690 of 10455
Quote:
Originally Posted by Slackaveli View Post

mine's a 1000w single rail, but, tbh... i am mad for not just getting the 1200 or 1500w corsair. because, why NOT? It means you can go sli at will or always have headroom, never stress the psu. oh well. But, like right now if i threw another Ti in my rig.. I'd not feel comfortable with only 1000w single rail.

That is another story, i agree with that argument, why not if you can afford it sure...
    
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