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Quick (noob worthy) question about SLI

post #1 of 16
Thread Starter 
Hey guys,

So real quick question about SLI:
I have this card: 1058 MHz Core (Boost Clock:1124MHz)
http://www.msi.com/product/vga/N680GTX_Twin_Frozr_2GD5OC_.html

Getting this card tomorrow: 1084 MHz Core (Boost Clock:1150MHz)
https://www.evga.com/products/pdf/02G-P4-2683.pdf


Should I put the EVGA one in the MAIN slot and use the MSI as SLI?
Or does it not matter?

Reason I mention this is because of the faster clocks the EVGA one has.

Also on another tangent - What's the best way to test if the card works perfectly?
When I get the used GPU I want to test it to make sure everything is fine with it.

Thanks for reading - Any help appreciated smile.gif
post #2 of 16
does not matter. they will run at same clock
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post #3 of 16
Doesn't matter. I would put the MSI card on top only because its cooler looks better. Top cards tend to run a bit warmer. SLI will also downclock the faster card; you can change this later. I've only worked with crossfire, but you might be limited to using the video outputs only on the primary (i.e. top) GPU. I am not 100% sure if this is true for SLI as well.
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post #4 of 16
Thread Starter 
Quote:
Originally Posted by Dankal View Post

does not matter. they will run at same clock

Quote:
Originally Posted by CynicalUnicorn View Post

Doesn't matter. I would put the MSI card on top only because its cooler looks better. Top cards tend to run a bit warmer. SLI will also downclock the faster card; you can change this later. I've only worked with crossfire, but you might be limited to using the video outputs only on the primary (i.e. top) GPU. I am not 100% sure if this is true for SLI as well.

thanks guys!
Looks wise - I couldn't careless really.
post #5 of 16
They will not run at the same speed and the faster card will not down lock, if you don't plan on over clocking them I'd see which one actually boosts highest under benchmarks and put that as your main card in case there are any games you play that don't have sli compatibility, if you do overclock you can just overclock them individually so they both will boost to the same speeds
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post #6 of 16
Agreed they will not clock the same and you should use afterburner to set a mutual clock speed or you could see some screen tearing.mad.gif
post #7 of 16
Thread Starter 
Quote:
Originally Posted by y2kcamaross View Post

They will not run at the same speed and the faster card will not down lock, if you don't plan on over clocking them I'd see which one actually boosts highest under benchmarks and put that as your main card in case there are any games you play that don't have sli compatibility, if you do overclock you can just overclock them individually so they both will boost to the same speeds

I don't plan to OC, simply because of a few reasons
Main one being: OC'ed my GTX680 and didn't see considerable gains for the higher temps I was pushing my card at. By that I mean not in synthetic benches (which there were gains) but in actual gaming performance - is BF3 and BF4 which I was playing the most.

With the OC I was able to reach:
GPU 1114mhz (default: 1059)
Boost 1179mhz (default: 1124)
Mem 1802 (default: 1502)

Here's those results:
http://www.overclock.net/t/1445524/solved-utterly-confused-with-msi-gtx680-msi-afterburner-overclocking/10#post_21260404

EDIT:
I'll give it a whirl now in BF4 - why not I guess.

As for power consumption - I only got a 750W - OC'ing both and having SLI...bit thin on watts no?
Quote:
Originally Posted by profit8652 View Post

Agreed they will not clock the same and you should use afterburner to set a mutual clock speed or you could see some screen tearing.mad.gif

Screen tearing is to do with the monitor.
Edited by Totally Dubbed - 3/11/14 at 4:54pm
post #8 of 16
Quote:
Originally Posted by Totally Dubbed View Post

I don't plan to OC, simply because of a few reasons
Main one being: OC'ed my GTX680 and didn't see considerable gains for the higher temps I was pushing my card at. By that I mean not in synthetic benches (which there were gains) but in actual gaming performance - is BF3 and BF4 which I was playing the most.

With the OC I was able to reach:
GPU 1114mhz (default: 1059)
Boost 1179mhz (default: 1124)
Mem 1802 (default: 1502)

Here's those results:
http://www.overclock.net/t/1445524/solved-utterly-confused-with-msi-gtx680-msi-afterburner-overclocking/10#post_21260404

EDIT:
I'll give it a whirl now in BF4 - why not I guess.

As for power consumption - I only got a 750W - OC'ing both and having SLI...bit thin on watts no?
Screen tearing is to do with the monitor.
For 2 680s and a 3770k, a 750 watt PSU is more than enough, even with everything overclocked to the gills
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post #9 of 16
Your AX 750 will have no issues. I'm running 2x GTX 670s overclocked and an i5 2500k @ 4.5 with a 700W PSU just fine, and with headroom to spare.
Just a heads up, after I installed SLI by adding my new (used) card to the top and just sticking the bridge on and booting, basically any game I played would crash instantly, until I removed the drivers, booted and installed the drivers without the SLI bridge on, then rebooted, rebooted again with the SLI bridge on and hey presto.

So from my experience, you should at least boot your computer with both cards in but without the SLI bridge (first boot), if not remove the drivers before installing the second card and then completing the steps I stated above!

Enjoy thumb.gif
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post #10 of 16
Thread Starter 
Quote:
Originally Posted by y2kcamaross View Post

For 2 680s and a 3770k, a 750 watt PSU is more than enough, even with everything overclocked to the gills

Sweet ok - but at the end, the cards rely on each other no?
So I can't OC one and leave another one far behind right?

How does one OC cards separately btw?
Quote:
Originally Posted by sidewaykill View Post

Your AX 750 will have no issues. I'm running 2x GTX 670s overclocked and an i5 2500k @ 4.5 with a 700W PSU just fine, and with headroom to spare.
Just a heads up, after I installed SLI by adding my new (used) card to the top and just sticking the bridge on and booting, basically any game I played would crash instantly, until I removed the drivers, booted and installed the drivers without the SLI bridge on, then rebooted, rebooted again with the SLI bridge on and hey presto.

So from my experience, you should at least boot your computer with both cards in but without the SLI bridge (first boot), if not remove the drivers before installing the second card and then completing the steps I stated above!

Enjoy thumb.gif

sweet thanks for the info - I'll definitely re-install the drivers, to be sure smile.gif!
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