monievga12
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Hey there,
I have a 2 way sli with 2 ea. 780 hydro copper. Now I want to buy a third - and have my hands on a 780 classified hydro copper. The only diff between the classified and the reference, is the Base Clock and the Bus Clock. 980-983 MHz and 1033 - 1046 MHz.
Does anyone know if they will work together in 3 way SLI?
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bdary
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Re: SLI compatibility
2015/02/07 11:48:58
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☼ Best Answerby monievga12 2015/02/08 13:04:08
They should SLI together just fine. They can run with different clock speeds. As long as the amount of vRam is the same and all have the same memory bit width (256bit, 384bit, etc.).
If any of the cards are a different height, flexible SLI bridge cables would be needed instead of a rigid SLI board(s).
Make sure your motherboard supports 3-way SLI and the your PSU can handle the extra load from another 780.
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Cool GTX
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Re: SLI compatibility
2015/02/07 12:12:00
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☄ Helpfulby monievga12 2015/02/08 13:06:19
bdary
They should SLI together just fine. They can run with different clock speeds. As long as the amount of vRam is the same and all have the same memory bit width (256bit, 384bit, etc.).
If any of the cards are a different height, flexible SLI bridge cables would be needed instead of a rigid SLI board(s).
Make sure your motherboard supports 3-way SLI and the your PSU can handle the extra load from another 780.
+1 My understanding is that the PC will treat all 3 cards at the slowest clock speed of the three, to synchronize them.
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monievga12
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Re: SLI compatibility
2015/02/08 13:06:16
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Thank You both so much - already picked up the card - just waiting for a new m/b - Gigabyte GA-Z97 gaming G1. I was a little worried there - but You guys helped me out - Thank You.
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HeavyHemi
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Re: SLI compatibility
2015/02/08 13:25:57
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Cool GTX
bdary
They should SLI together just fine. They can run with different clock speeds. As long as the amount of vRam is the same and all have the same memory bit width (256bit, 384bit, etc.).
If any of the cards are a different height, flexible SLI bridge cables would be needed instead of a rigid SLI board(s).
Make sure your motherboard supports 3-way SLI and the your PSU can handle the extra load from another 780.
+1
My understanding is that the PC will treat all 3 cards at the slowest clock speed of the three, to synchronize them.
Each GPU will run at it's own base and boost clocks. Drivers no longer force the clocks to match the GPU in PCIe slot one or which ever GPU you have set to be the master in Afterburner. However, using the 'sync' function with Afterburner or Precision can cause the clocks and or voltages to change. So personally I don't use the sync feature and set each GPU individually for both clocks and voltage in SLI. I'm surprised, running SLI, you have not noticed this.
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Cool GTX
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Re: SLI compatibility
2015/02/09 13:17:29
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☄ Helpfulby monievga12 2015/02/20 04:47:18
HeavyHemi Each GPU will run at it's own base and boost clocks. Drivers no longer force the clocks to match the GPU in PCIe slot one or which ever GPU you have set to be the master in Afterburner. However, using the 'sync' function with Afterburner or Precision can cause the clocks and or voltages to change. So personally I don't use the sync feature and set each GPU individually for both clocks and voltage in SLI. I'm surprised, running SLI, you have not noticed this.Um, well the answer is: my SLI is a matched pair (bought two of the same card) to eliminate making it more complicated than it has to be. After all adjustments to achieve best Overclocking with either card to its maximum, I dial back about 5% for stability - while bring them to identical speeds. I do not worry about identical voltage.
Though my PC and industrial automation background is massive; this is my first personal SLI build and it is quit new. So, thank you for the educational input and clarity on the subject matter at hand. I look forward to conducting more experiments, gaining more experience and reading more posts to continue my education on SLI. http://www.geforce.com/whats-new/guides/introduction-to-sli-technology-guide#4excerpt:It's worth noting that in the case of pairing graphics cards with discrepant clock speeds, the driver will not attempt to synchronize their frequencies unless you instruct it to through tools like EVGA Precision or MSI Afterburner. This is completely optional and not doing so isn't likely to cause any adverse effects, but some people find it's easier/stabler to overclock with the GPUs running at identical speeds. Should you choose to run the cards with asynchronous clocks, it's recommended the faster GPU is installed as the primary so single-GPU or low-scaling applications can benefit from its slight performance advantage.
post edited by Cool GTX - 2015/02/18 20:10:02
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monievga12
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Re: SLI compatibility
2015/02/15 12:38:54
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Cool GTX
HeavyHemi
Each GPU will run at it's own base and boost clocks. Drivers no longer force the clocks to match the GPU in PCIe slot one or which ever GPU you have set to be the master in Afterburner. However, using the 'sync' function with Afterburner or Precision can cause the clocks and or voltages to change. So personally I don't use the sync feature and set each GPU individually for both clocks and voltage in SLI. I'm surprised, running SLI, you have not noticed this.
Um, well the answer is: my SLI is a matched pair to eliminate making it more complicated than it has to be.
Though my PC and industrial automation background is massive; this is my first personal SLI build and it is quit new. So, thank you for the educational input and clarity on the subject matter at hand. I look forward to conducting more experiments, gaining more experience and reading more posts to continue my education on SLI.
Ok, more thanks to You all for Your input - in return I will inform about the results I get when installing a 780 classified with 2 780 reference. By the way, PSU is changed to Corsair AX1500i. (That should make me safe - when the fourth 780 arrives.......:)
post edited by monievga12 - 2015/02/15 12:42:05
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HeavyHemi
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Re: SLI compatibility
2015/02/15 13:10:20
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☄ Helpfulby monievga12 2015/02/20 04:46:54
Cool GTX
HeavyHemi
Each GPU will run at it's own base and boost clocks. Drivers no longer force the clocks to match the GPU in PCIe slot one or which ever GPU you have set to be the master in Afterburner. However, using the 'sync' function with Afterburner or Precision can cause the clocks and or voltages to change. So personally I don't use the sync feature and set each GPU individually for both clocks and voltage in SLI. I'm surprised, running SLI, you have not noticed this.
Um, well the answer is: my SLI is a matched pair to eliminate making it more complicated than it has to be.
Though my PC and industrial automation background is massive; this is my first personal SLI build and it is quit new. So, thank you for the educational input and clarity on the subject matter at hand. I look forward to conducting more experiments, gaining more experience and reading more posts to continue my education on SLI.
Mine are a 'matched pair' of EVGA TITAN SC. However one boosts on stock settings to 1032mhz, the other to 1045mhz. So, that they both run boost at 1045mhz, I add 13mv to the GPU that normally boosts to 1032mhz which makes it boost under load to 1045. It doesn't make any discernible performance difference but I personally like them running identical speeds. 
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bdary
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Re: SLI compatibility
2015/02/15 14:52:06
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monievga12
Cool GTX
HeavyHemi
Each GPU will run at it's own base and boost clocks. Drivers no longer force the clocks to match the GPU in PCIe slot one or which ever GPU you have set to be the master in Afterburner. However, using the 'sync' function with Afterburner or Precision can cause the clocks and or voltages to change. So personally I don't use the sync feature and set each GPU individually for both clocks and voltage in SLI. I'm surprised, running SLI, you have not noticed this.
Um, well the answer is: my SLI is a matched pair to eliminate making it more complicated than it has to be.
Though my PC and industrial automation background is massive; this is my first personal SLI build and it is quit new. So, thank you for the educational input and clarity on the subject matter at hand. I look forward to conducting more experiments, gaining more experience and reading more posts to continue my education on SLI.
Ok, more thanks to You all for Your input - in return I will inform about the results I get when installing a 780 classified with 2 780 reference. By the way, PSU is changed to Corsair AX1500i. (That should make me safe - when the fourth 780 arrives.......:)
That should do it... 
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monievga12
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Re: SLI compatibility
2015/04/28 11:02:33
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Ok then, what happend... It shows that a EVGA GTX 780 HC and a EVGA GTX 780 HC Classified - dont fit together at all ind the PCI slots. The holes for the fittings simply does not line up at all - so in the end - I sold my Classified and bought a standard - end of storry. So, sorry, I never got to try out, if there were a problem or not, running the two cards in SLI. But I still believe that it would work. But thanks again for the participation in this post.  If You look closely You´ll see that the classified is way larger than the standard HC - and that they dont line up. (look at top of cards)
post edited by monievga12 - 2015/04/28 11:11:10
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