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4 GB GTX 680s for Quad SLI

post #1 of 44
Thread Starter 
I've been thinking about doing a quad SLI setup for the heck of it and the E-Peen and I might just go down that road, but I've failed to find any decent GTX 680s with 4 GB of video memory. The stuff on newegg all had exposed backsides, i.e no backplates. I remember MSI saying they were going to launch their Lightning cards in 4 GB variants but I don't see them anywhere. Oh, and one more important detail, they will be watercooled, obviously, so that's why I was zooming in on the lightning cards as EK already have blocks out for them.
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post #2 of 44
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130794
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130799
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130798
post #3 of 44

I only have one concern:  are you going to get a good 850W power supply?  :)

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post #4 of 44
Thread Starter 
All those cards have reference design PCBs, am I right?
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post #5 of 44
You might as well wait for the 7xx series release, and pick up some used 680s for cheap. It isn't like your current rig is lacking to where you HAVE to do this right now.

If you are going to do a quad-SLI setup, PLEASE get a higher resolution monitor or do a multi-monitor setup. Otherwise your investment in 4 GPUs is entirely wasted.
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post #6 of 44
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

I only have one concern:  are you going to get a good 850W power supply?  smile.gif

Hehe 850 for quad SLI. Oh well.
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post #7 of 44
Thread Starter 
Quote:
Originally Posted by ChrisTahoe View Post

You might as well wait for the 7xx series release, and pick up some used 680s for cheap. It isn't like your current rig is lacking to where you HAVE to do this right now.
If you are going to do a quad-SLI setup, PLEASE get a higher resolution monitor or do a multi-monitor setup. Otherwise your investment in 4 GPUs is entirely wasted.

I know, again, it's for E-Peen. Higher resolution monitor won't help me play games better. After having this 144 Hz monitor, I simply can't play on 60 Hz screens, so unless you know a 1440p or 1600p monitor that can do 144 or 120 Hz then let me know. As for a multi-monitor setup, I'm probably gonna get two more of these asus panels.
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Intel 750 400GB PCIe WD Red 8TB NAS 10 * 6TB HGST Desktar NAS (RAID Z2) Go away 
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EK-FB GA Z170X Monoblock EK-FC1080 GTX Waterblock/Backplate 2 * Dazmode Darkside LP360 MCP355 DDC @ 7V 
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9 * Corsair SP120 Quiet Edition @ 7V 8.1 Pro 12-bit Asus VG27HE 27" 1080p @ 145Hz Corsair Vengeance K60 
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EK GTX 1070 Seahawk Feser TFC Admiral 240 Black Ice GTX Xtreme M92 6 * Silverstone SST-FN121-P 
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post #8 of 44
Quote:
Originally Posted by Cyclops View Post

I know, again, it's for E-Peen. Higher resolution monitor won't help me play games better. After having this 144 Hz monitor, I simply can't play on 60 Hz screens, so unless you know a 1440p or 1600p monitor that can do 144 or 120 Hz then let me know. As for a multi-monitor setup, I'm probably gonna get two more of these asus panels.

Well at least you'll have a 5760x1080 resolution going to put the cards to use. Quad SLi for just one 1080p monitor is like buying a lifted diesel truck for city use, if you know what I mean.
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post #9 of 44
Quote:
Originally Posted by Cyclops View Post


Hehe 850 for quad SLI. Oh well.

 

I know; the more fun you want to have, the more expensive it gets.  lol

 

Here's my proof of 850W:

 

http://www.guru3d.com/articles_pages/geforce_gtx_680_3_way_sli_review,4.html

 

They only did 3-way SLi, but they measured the power draw individually:  first with just one card, then with the 2nd, and finally with the 3rd.  So this makes it easy to figure out what it would have been if they added a 4th.  So here's what my finding is:

 

When they added the 2nd card, the power draw from the wall outlet went up by 166W.  When they added the 3rd card, it went up by 176W.  So I'll just assume that adding a 4th card would increase the power draw by about 185W.  So here's my calculation based on that:

 

With three GTX 680s under full load in their system, their power supply pulled 649W from the wall outlet.  Their CPU was idling, so we have to add about 150W for that.  Adding a 4th GTX 680 would probably add another 185W to how much power the PSU is pulling from the wall outlet, bringing the total amount of power being pulled from the wall outlet to 984W.  So, if the PSU is 85% efficient while pulling 984W from the wall outlet, then that would mean the system is pulling 836W from the PSU - but only if there is a full load on the GTX 680s and the CPU simultaneously.

 

If my finding is correct, then I would think that the HX750 would be stretched beyond its limits a little bit.  It would probably work, but I don't know how long and it would probably get too hot.  Although, if you are loading the 4 GTX 680s and your CPU is basically just idling (if you never have a simultaneous maximum load on both the CPU and the GTX 680s), then the HX750 would defintely be enough.  I mean, adding about 185W to 649W only comes out to be 834W being pulled from the wall which comes out to being 708W being pulled from the PSU (if it's 85% efficient while pulling 834W from the wall).

 

Although still, I'd personally be unable to relax if I were trying to power such a setup with a quality-made 750W PSU of any kind.


Edited by TwoCables - 11/21/12 at 9:36pm
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post #10 of 44
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

I know; the more fun you want to have, the more expensive it gets.  lol

Here's my proof of 850W:

http://www.guru3d.com/articles_pages/geforce_gtx_680_3_way_sli_review,4.html

They only did 3-way SLi, but they measured the power draw individually:  first with just one card, then with the 2nd, and finally with the 3rd.  So this makes it easy to figure out what it would have been if they added a 4th.  So here's what my finding is:

When they added the 2nd card, the power draw from the wall outlet went up by 166W.  When they added the 3rd card, it went up by 176W.  So I'll just assume that adding a 4th card would increase the power draw by about 185W.  So here's my calculation based on that:

With three GTX 680s under full load in their system, their power supply pulled 649W from the wall outlet.  Their CPU was idling, so we have to add about 150W for that.  Adding a 4th GTX 680 would probably add another 185W to how much power the PSU is pulling from the wall outlet, bringing the total amount of power being pulled from the wall outlet to 984W.  So, if the PSU is 85% efficient while pulling 984W from the wall outlet, then that would mean the system is pulling 836W from the PSU - but only if there is a full load on the GTX 680s and the CPU simultaneously.

If my finding is correct, then I would think that the HX750 would be stretched beyond its limits a little bit.  It would probably work, but I don't know how long and it would probably get too hot.  Although, if you are loading the 4 GTX 680s and your CPU is basically just idling (if you never have a simultaneous maximum load on both the CPU and the GTX 680s), then the HX750 would defintely be enough.  I mean, adding about 185W to 649W only comes out to be 834W being pulled from the wall which comes out to being 708W being pulled from the PSU (if it's 85% efficient while pulling 834W from the wall).

Although still, I'd personally be unable to relax if I were trying to power such a setup with a quality-made 750W PSU of any kind.

You're pretty anal about this stuff aren't ya? Well, I overclock pretty much everything in the system to their maximum potential. I've fed 1.45 volts to 3930Ks and watch the system consume about 400 watts under prime95. Although real life scenarios never stretch it that far, I like to have reasonable headroom, Adding four GPUs and overclocking them on top of everything, I'm not gonna settle for anything bellow 1200. The thing is I'd like to get a unit with at least 8 x 6+2 PCI-E connectors. I don't like using molex to 6-pins, as safe as that might be, I'd just like to get the juice directly from 12 volt rail and not alot of 1000-ish watt PSUs have 8 PCI-E connectors.
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