Is it possible SLI Classified could be pulling this much juice??

[YBS1]

I got around to flashing the skyn3t BIOS to my SLI 780 Classifieds last night and ran into something I wasn't expecting at all. While having my 3930K clocked to 5.1GHz and the cards clocked at 1342/7404, 1.27/1.66v, 120% power target...Once 3DMark finished the loading screen, right as it was going to start pumping out glorious frames my pc went and shut right the **** down. This wasn't a crash or a lockup, just a quick and clean cease and desist. Figuring this was a fluke, I tried again, same result.

Long story short...After playing around with it a bit the cards are fine running that pace so long as I'm not running the cpu at 5-5.1GHz, 4.8 was fine. The cpu is fine running at 5.1GHz, but not with the cards juiced up with new found power. I'm running a 1300 watt Cooler Master 80 Plus Gold power supply with a single 12v rail (105A 1260W), is it possible the combination of a 5.1GHz 3930K and 2 Classifieds is possibly pulling enough juice to shut this thing down? Or have I overlooked something else?

 

[Grooveriding]

Yes. GK110 has astronomical power consumption overclocked/volted.

 

[YBS1]

Well, I knew it was high, and I have read reports of this happening to a few people but for some reason I assumed it was people running tri-SLI. I didn't really see this coming with just two cards. haha The funny thing is I have a third Classified sitting in my cart but I've been waffling back and forth the past three days on it, guess that's out now. lol

They do sell 1500 watt supplies too.......:twisted:

 

[lopri]

If my memory serves, Ryan Smith of AT measured something like 850W from the wall for GTX 480 SLI. I don't think that test involved overclocking on either the GPUs or the platform. That was a turning point for me in believing these unprecedent power usage numbers users report.

 

[Meghan54]

Remember also that your 1260W output from your power supply is only going to happen if you are drawing nothing off the other rails. The +12V rail doesn't exist in isolation from the other rails. Begin to draw off the +3.3V and +5V rails, and the available output from the +12V rail decreases.

 

[Grooveriding]

Well, I knew it was high, and I have read reports of this happening to a few people but for some reason I assumed it was people running tri-SLI. I didn't really see this coming with just two cards. haha The funny thing is I have a third Classified sitting in my cart but I've been waffling back and forth the past three days on it, guess that's out now. lol

They do sell 1500 watt supplies too.......:twisted:

I'm surprised you're shutting down a 1300W PSU with just two of them though.

On overclock.net someone did some rough approximations of his Titans running with 1.3V and figured they were pulling almost 400W a piece... The 780 Classifieds are probably up around there as well. I can run mine at 1400 with 1.33V, but keep them at 1359 with 1.28 and haven't experienced any shutdowns.

Maybe your PSU is going bad or is worn down. Seems crazy that just two of them and your 3930K overclock is shutting down a 1300W PSU. How much voltage does your SB-E need for 5ghz ?

 

[Silverforce11]

SB-E with that OC, probably 250W..

400W each Titan x 2 = 800W.

Will definitely stress a weaker/older PSU.

 

[hawtdawg]

With furmark and IBT max together, I could only make my 3770K 4.5@1.3v and 1200mhz 780@1.212v pull 450 watts from the wall. Seems unlikely that you would be using 3 times that. I have a Corsair AX850 PSU, and am planning on throwing another 780 in my rig, and I don't feel like I'll have to worry about the PSU being a problem.

 

[YBS1]

Oh! You gotta be kidding me....two points, just two measly points?

It is shutting down the psu, I got it somewhat under control. Well enough for this run anyway at 5.1, 1342/7404. Trying again at 1355? (guessing that's what it would have been) shut it down. I left the power target at 100% for the completed run instead of setting it higher like I had previously.

 

[3DVagabond]

I got around to flashing the skyn3t BIOS to my SLI 780 Classifieds last night and ran into something I wasn't expecting at all. While having my 3930K clocked to 5.1GHz and the cards clocked at 1342/7404, 1.27/1.66v, 120% power target...Once 3DMark finished the loading screen, right as it was going to start pumping out glorious frames my pc went and shut right the **** down. This wasn't a crash or a lockup, just a quick and clean cease and desist. Figuring this was a fluke, I tried again, same result.

Long story short...After playing around with it a bit the cards are fine running that pace so long as I'm not running the cpu at 5-5.1GHz, 4.8 was fine. The cpu is fine running at 5.1GHz, but not with the cards juiced up with new found power. I'm running a 1300 watt Cooler Master 80 Plus Gold power supply with a single 12v rail (105A 1260W), is it possible the combination of a 5.1GHz 3930K and 2 Classifieds is possibly pulling enough juice to shut this thing down? Or have I overlooked something else?

Nah, I'm not buying it. No way you're drawing anywhere near 1300W from that system. If it's the PSU, it has issues.

 

[YBS1]

Nah, I'm not buying it. No way you're drawing anywhere near 1300W from that system. If it's the PSU, it has issues.

It may just be weak, because it's less than a year old.

 

[Slomo4shO]

Kill-A-Watt is useful in these circumstances. I'm running a 1200 watt Cooler Master 80 Plus Gold power supply and it handles 4 7950 and an overclocked 4770K without peaking above 1100 watts from the outlet... If your issue is with the PSU, its is likely not due to a capacity overload. You should checking the actual power draw and then consider RMAing the PSU.

 

[BallaTheFeared]

You could also be tripping the OVP on the card, though typically that gives a sound loop lock but it can also straight restart the PC.

TBH I'm not even sure if Nvidia still has a OVP chip soldered into the PCB or not with Kepler.

 

[YBS1]

You could also be tripping the OVP on the card, though typically that gives a sound loop lock but it can also straight restart the PC.

TBH I'm not even sure if Nvidia still has a OVP chip soldered into the PCB or not with Kepler.

I wouldn't think that would be the case considering some of these under water are having 1.4v+ being pushed through them and are not reporting that issue. 1.275v is the most I've tried on mine.

 

[blackened23]

Well, I don't know how many volts you're putting into your classified (Do you have EV BOT?) But I can agree with groove on one thing - voltage = more power consumption. The power can increase exponentially, a lot of folks don't realize this - While I doubt you're hitting 1300W, let me put this in perspective. I had GTX 680 Lightnings which had software tricks allowing over voltage up to 1.4V and beyond through software. At 1.4V, my power draw at the wall (total system) with a single card exceeded 850W. This is as compared to stock settings, where I would hardly ever pass the 330-370W mark. Temperatures also became unsustainable unless I used really high manual fan speeds, but then again this was for 1400+ MHz overclocks.

Voltage does make a dramatic difference in terms of temps and power draw. That being said, 1300W is a lot of juice and I'm not sure you're going that high - what does the skynet BIOS do on the classy?

 

[Grooveriding]

Skynet BIOS increases the TDP threshold to over 500W or some such thing. It's pretty much mandatory if you want to push voltage into the classified cards or else they'll throttle constantly.

 

[YBS1]

That being said, 1300W is a lot of juice and I'm not sure you're going that high - what does the skynet BIOS do on the classy?

Well, this one will reportedly allow up to a 600 watt power limit. That being said, I don't have mine set high enough on the power target or have my clocks/voltage high enough to actually approach near that.

 

[aigomorla]

Well, I knew it was high, and I have read reports of this happening to a few people but for some reason I assumed it was people running tri-SLI. I didn't really see this coming with just two cards. haha The funny thing is I have a third Classified sitting in my cart but I've been waffling back and forth the past three days on it, guess that's out now. lol

They do sell 1500 watt supplies too.......:twisted:

ask gillbot..

i had 4 gpu's in my system which required me running a 1kw + 750W for a dual PSU setup.
I used a dual PSU adapter... u dont need a single LARGE PSU, unless u have no room for 2 PSU's.

You couldnt pay enough to do it again...
Infact i wouldnt even want to attempt that nightmare again.

 

[Elfear]

With an i7 SB at 4.9GHz/1.52V and three 7970's at 1.3V I saw 1250W at the wallplate.

Does an unlocked 780 use that much more power than a 7970?

 

[Vesku]

If your power supply is a Coolermaster Silent Pro 1300W, it should be alright. Personally, I'd check the draw from wall with a power meter.

http://www.tweaktown.com/reviews/46...rid_1300_watt_power_supply_review/index5.html

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=193

 

[Grooveriding]

With an i7 SB at 4.9GHz/1.52V and three 7970's at 1.3V I saw 1250W at the wallplate.

Does an unlocked 780 use that much more power than a 7970?

The general guesstimate is about 400W with 1.3V going through them. On OCN someone running 4 Titans @ 1.3V and an OCed SB-E was shutting down his 1500W PSU.

 

[YBS1]

At this point I'm starting to think the psu is on the weak side because in theory it should be ok with what we're all guessing is the approximate load on it, though I'm sure it's rather high. Yes, it's the Silent Pro Hybrid 1300. To Elfear, yeah, I'm guessing an SB-E@5.1/1.49v with two unlocked 780's will pull as much, possibly more than an SB@4.9/1.52v and three 7970s...Just a guess though. I'll probably need a Kill a Watt for any better info. I would think that maybe I'm just pulling enough power with the newly unlocked 780's to cause instability with the 5.1GHz overclock because of voltage fluctuations if not for the fact it's not once simply crashed/locked up, it's always been an immediate shutdown. So I don't know.

 

[YBS1]

I do have a 650 watt supply sitting in an unused pc, I may use the paperclip trick and try running one of the cards off that later on. What could possibly go wrong? :sneaky:

 

[BallaTheFeared]

But it's crashing out 3Dmark right?

What happens if you just play a game?

Your CPU shouldn't load up much except in the physics test and in the combined, but I'd imagine you'd be bottlenecked by your your CPU in the combined test either way.

If it's crapping out on the first test it doubt it really matters that your CPU is at 5.1GHz, meaning your cpu isn't making a huge impact on power consumption.

That said my highest draws are in 3Dmark on the gpu tests, even if my cpu wasn't being worked very hard. I draw less power on combined than I do in the first two tests.

Try Crysis 3 maxed out, see if it crumbles there too, because that's actually a fairly balanced load it should work both the cpu and gpus.

 

[wilds]

Get a program that can monitor power supply usage. AIDA64 can monitor it quite well, but it only has a 30 day free trial. There's probably a better utility out there, but it provides up-to-date watt usage very accurately.

Furmark is a tool that will stress your GPU's (with minimal CPU usage) to their max usage. This will probably give you a good idea of how much your 780's can really draw. Furmark will probably be more than every game really pushes it.

But yeah, get a 500w or 750w alongside. You got some nice clocks overall.