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Can I get away with GTX 590 quad SLI with 850W PSU?

Do you think I run a GTX 590 x2 with my old 850W PSU without killing it?


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qubit

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Just bought a Zotac GTX 590 off eBay for £160 and am awaiting delivery. Got it to play around with quad SLI, like a proper PC enthusiast. ;) I've got an EVGA Classified to pair it with.

I know two of these require something like an 1100W PSU to run properly and the new Corsair 1200W PSU I bought some time ago still has an unresolved problem (long story) so I can't use it for now. Therefore, I'm still on my 5 year old Corsair HX850W v1 PSU at the moment.

Its worked flawlessly the whole time I've had it and the reviews were excellent at the time, saying it could even be loaded up to around 1KW without showing significant strain. However, it is old and not officially rated for that kind of power, so my questions are:

1 Do you think I'm likely to get away with running both cards in 2D only just to check out the NVIDIA control panel options with 4 GPUs running?

2 If yes to question 1, then do you think I could get away with a "light" 3D load, such as an old game eg Unreal Tournament 2004 for a short time? I wouldn't try Far Cry 4, Furmark or anything like that which gives the GPUs a real workout and really draws current. Obviously, I won't be overclocking the cards either.

Note my PC specs are up to date if you need to check out my current setup.
 

newtekie1

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1 Do you think I'm likely to get away with running both cards in 2D only just to check out the NVIDIA control panel options with 4 GPUs running?

Yes, I think you can get away with sitting at the desktop with all 4 GPUs with the HX850.

2 If yes to question 1, then do you think I could get away with a "light" 3D load, such as an old game eg Unreal Tournament 2004 for a short time? I wouldn't try Far Cry 4, Furmark or anything like that which gives the GPUs a real workout and really draws current. Obviously, I won't be overclocking the cards either.

Nope, don't even attempt 3D load. Don't even open the render test in GPUz. There isn't really such a thing as "light" 3D load. Loading the cards with anything 3D will kick them up to their max clocks and load the GPUs with work. Unreal Tournament 2004 is going to put the same strain on the GPUs as Far Cry 4, Unreal will just get way higher framerates than Far Cry 4.

On a different note, I'd change out that motherboard before putting both cards in and running anything 3D. Those cards pull a down right stupid amount of power through the PCI-E slot. Your motherboard doesn't have an auxiliary power input for the PCI-E bus. You're headed for this.
 
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I think it would boot fine, and maybe even load a youtube video, but if anything goes wrong you might be out two 590s and an 850w PSU. I wouldn't risk it.
 

qubit

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Thanks people, so 2D only with the 850, as I'd suspected. :ohwell:

NT: I'm surprised that they would burn out my mobo though, since to be compliant with the PCI-E spec they'd have to be limited to 75W through the PCI-E mobo connector. Does this mean that they're not, then? I tell you, I'm not going to replace my mobo just for something to play with (which would also likely require a new CPU now as that socket is obsolete) so I may well just cancel the order. Shame they put such a big electrical load.

Also, I was saying about a "light" 3D load, because different programs can run the GPUs harder than others eg Furmark causing them to pull more current and heat up more. It would be nice to know what kind of code it takes to do this to a GPU. I've also noticed that running a higher resolution at the same quality settings makes the GPU card heat up more. You'd think with vsync off the overall workload is the same, with just the framerate varying, but it doesn't seem to be. I don't know enough about this to really explain why cards behave this way.
 
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MxPhenom 216

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you will probably blow the card before PSU.
 

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I'm surprised that they would burn out my mobo though, since to be compliant with the PCI-E spec they'd have to be limited to 75W through the PCI-E mobo connector. Does this mean that they're not, then?

I don't believe they are complaint with the PCI-E spec. Even if they were, two of the cards will be pulling 150w through just two pins on the 24-pin connector. It isn't a good setup.
 
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the TDP of a 590 is 365watts for 1 card. So lookin at about 130watts of play room to power rest of your machine so if you put it under good heavy load. don't be shocked if machine freezes or reboots on ya. You should get a 1000+watt PSU.
 

MxPhenom 216

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the TDP of a 590 is 365watts for 1 card. So lookin at about 130watts of play room to power rest of your machine so if you put it under good heavy load. don't be shocked if machine freezes or reboots on ya. You should get a 1000+watt PSU.
wrong, TDP != Power consumption
 

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yes by all means give it a shot and report back
 

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I think you're asking to fry something. Simply put, don't do it unless you like to live dangerously. Danger zone!

More GPUs, more problems. :)
 

qubit

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I think you're asking to fry something. Simply put, don't do it unless you like to live dangerously. Danger zone!

More GPUs, more problems. :)
Do you mean not even try it with the 1200W PSU when I get a properly working one back?

Sorry if I'm being slow, but it's way past my bedtime now and I really should plug myself into the charger. :laugh:
 
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Underclock your cpu to a daring degree to get more volts to the gpu's. Your 2700k should do about 1.6ghz @ .8v. Maybe lower volts even. Shut off anything unnecessary in your motherboard bios such as audio, usb ports, anything that you don't need for the test. You should be able to shave about an at least an extra 100w that way.

You could even drop down to one stick or ram, just the ssd, etc. Unplug any hardware that is not needed like that disc drive. Might eek out a few extra watts that way too.
 

qubit

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That's a good point, if still a little dangerous. It'll kill the benchmarks though! :laugh:
 
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That's a good point, if still a little dangerous. It'll kill the benchmarks though! :laugh:
Can't do benchmarks in 2d mode :p

You just spent $160 on a gpu. Maybe the next thing to buy is a bigger psu just to put these cards to their full potential. Toys can wait a few weeks/months until then for real benching.
 
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Just bought a Zotac GTX 590 off eBay for £160 and am awaiting delivery. Got it to play around with quad SLI, like a proper PC enthusiast. ;) I've got an EVGA Classified to pair it with.

I know two of these require something like an 1100W PSU to run properly and the new Corsair 1200W PSU I bought some time ago still has an unresolved problem (long story) so I can't use it for now. Therefore, I'm still on my 5 year old Corsair HX850W v1 PSU at the moment.

Its worked flawlessly the whole time I've had it and the reviews were excellent at the time, saying it could even be loaded up to around 1KW without showing significant strain. However, it is old and not officially rated for that kind of power, so my questions are:

1 Do you think I'm likely to get away with running both cards in 2D only just to check out the NVIDIA control panel options with 4 GPUs running?

2 If yes to question 1, then do you think I could get away with a "light" 3D load, such as an old game eg Unreal Tournament 2004 for a short time? I wouldn't try Far Cry 4, Furmark or anything like that which gives the GPUs a real workout and really draws current. Obviously, I won't be overclocking the cards either.

Note my PC specs are up to date if you need to check out my current setup.
I believe looking back the GTX 590 peaks at stock around the area of 350-370 depending on clocks. So looking at both that's 740 watts on just GPU's (I am looking currently at some old reviews so hard to get the exact numbers because I am doing math on power load for the other parts of the system) which means only 110watts for the rest of the system. If you downclock the card enough you may be able to sustain 3D clocks for a bit but your going to be pushing your luck depending on how hard your PSU can go. The Corsair HX850 as I recall can go a bit above 850 watts but I do not think it is a good idea personally to risk your PSU (Albeit I would believe it would shut down first before damaging the system).
 

qubit

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@james888 I think you missed a bit in my OP. I've already got a 1200W PSU which would drive them comfortably, but it's faulty so I have to get round to sorting that out, hence I'm still using my trusty 850W for now. I was just curious if I could push it with two 590s (more like wishful thinking, lol).

Indeed Ghost, there's not really enough in reserve. :ohwell: I remember thinking at the time I got the 850W, it was "more than I needed" and that it would be enough for anything I threw at it and for years it was. I never foresaw wanting to install these two bad boys though - over a grand for the two of them when they were new, which I would never spend on graphics cards.
 
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wrong, TDP != Power consumption
Um its not exactly how much gpu uses but its damn close to what you can expect it to use. a quick look one draw one site says 500watts that was full system draw. There is a lot of factors as to what system they use but would support in that range of draw. so TDP is not exact but its what you can expect under full load which is what you should based power draw on.

I believe looking back the GTX 590 peaks at stock around the area of 350-370 depending on clocks. So looking at both that's 740 watts on just GPU's (I am looking currently at some old reviews so hard to get the exact numbers because I am doing math on power load for the other parts of the system) which means only 110watts for the rest of the system. If you downclock the card enough you may be able to sustain 3D clocks for a bit but your going to be pushing your luck depending on how hard your PSU can go. The Corsair HX850 as I recall can go a bit above 850 watts but I do not think it is a good idea personally to risk your PSU (Albeit I would believe it would shut down first before damaging the system).

Yea that is what i was getting too as well when well someone above say well you can see what he said. Yea 110watts for everything else is pretty close. he has an sandy bridge which is a 95watta tdp cpu at stock so that 110watts is well used up
 
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I know 580s use less power than 480s.... but at one time I ran 2 480s together, my 850w Silverstone would reset as soon as I started a game. Added a 2nd 800w psu, no more problems.
No idea, but your 1200w should run both 590s fairly well....
 
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Don't forget a multi-screen setup will force the cards to 3D clocks with anything below geforce 600 series. Probably be fine without load though.
 
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I know 580s use less power than 480s.... but at one time I ran 2 480s together, my 850w Silverstone would reset as soon as I started a game. Added a 2nd 800w psu, no more problems.
No idea, but your 1200w should run both 590s fairly well....
Looked up draw, both 480 and 580 had almost same power draw 244 vs 250watts so why it would reset is a good question, wonder if was issue of amp's not being enough to power them. But 1000watts should be at bare min the PSU needed to power a pair of 590's, 1200watt would be best for it. as would keep effciency in a better spot cause psu's tend to drop off a bit near their peak load.
 
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Don't even try qubit. Simply run the single GPU until you get the Corsair 1200w sorted out. Even then, your motherboard might not be up to the task. Most likely needs replacement.
4x 580's running off the Corsair 1200w will not allow you to get the full potential out of your cards. I would suggest hacking your 850w to act as your second power supply to power up 2 of the 580's.
 

Aquinus

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Do you mean not even try it with the 1200W PSU when I get a properly working one back?
No, I mean don't try it with the 850-watt. The 1200-watt is probably okay.
 
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I'd run one, measure 2D idle and 3D load with a power meter at the wall and find out the difference, and if you have that much to spare - THEN try both.

That said, i highly doubt you will have that much wattage left over so i voted no.
 

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That said, i highly doubt you will have that much wattage left over so i voted no.
That's my preference. I know people who've fried hardware because the PSU couldn't maintain +12v and some hardware ended up getting fried by virtue of running more current because of the reduced voltage and for anyone who knows Ohm's law, heat is proportional to current, not voltage. Personally I like to have some wiggle room with the PSU. Consider it provides power to every component, it's best not to take chances IMHO.
 
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