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[EVGA]GTX 1080 only support 2-way SLI - But better SLI performance than before (With HB SLI bridge) - Page 45  

post #441 of 471
Quote:
Originally Posted by rluker5 View Post

In the video they implied that they were going to be changing the signal path for the new sli so it wouldn't go over the pcie as much for pascal, but that it would remain the same for the older parts, and that the data would actually be more like a video signal than before. That is a break and is incompatible as far as I can tell. And now there are 2 versions of sli to do.
If I was in charge of the sli support team, you know I would put the current products first priority.
And if pcie risers work, you'd think sli cables can. Or do sli cables have to handle way more data than pcie? It's a short distance so less noise and the frequency can go up inversely proportional to it.
I wonder how much of the 1080's total output could be handled by a 4 lane pcie riser if nvidia's drivers let it run?

Making more bandwith for sli and leaving more for pcie was going to have to happen eventually, but not for 4k@60 which I run.
I just don't like that my setup "officially" shouldn't work well when it has until now. But I suppose it will only cost $460 to replace my 780ti's with polaris so long as their crossfire works well.
The way I understood it, the old SLI bridge works just like the new one, provided it has enough bandwidth for the resolution and refresh rate being used. Sending stuff over PCIe would have started back when SLI was made compatible with high resolutions, now they're supporting those resolutions over the bridge.

Did you look at the graph they provided? The spike for using PCIE was about 10ms for 11520x2160 Presumably that penalty is proportional to resolution, so a single 4k monitor would be more like 3ms. It is an issue you probably have but don't notice. The point of the bridge is that you don't have to copy data before scanning, you just scan directly from the second GPU.

Has anyone done FCAT on crossfire in 4k surround?
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post #442 of 471
Quote:
Originally Posted by TranquilTempest View Post

The way I understood it, the old SLI bridge works just like the new one, provided it has enough bandwidth for the resolution and refresh rate being used. Sending stuff over PCIe would have started back when SLI was made compatible with high resolutions, now they're supporting those resolutions over the bridge.

Did you look at the graph they provided? The spike for using PCIE was about 10ms for 11520x2160 Presumably that penalty is proportional to resolution, so a single 4k monitor would be more like 3ms. It is an issue you probably have but don't notice. The point of the bridge is that you don't have to copy data before scanning, you just scan directly from the second GPU.

Has anyone done FCAT on crossfire in 4k surround?

Listening more closely, it seems I may have been wrong about the extent of difference between the new and old sli. The new one looks to be (650*2)/400 times as fast as the old, and the driver-card autodetects the bridge and switches how the cards communicate, so nvidia could give crappy sli support to all old setups, but they wouldn't have to do so on the basis of saving effort.
It seems that rep was just selling the old as new when he was describing how sli works at 3:05. If it is a differently configured signal then you would need a different part of the driver which is what I originally thought.
I didn't see the graph, your mention is all the information I have on it. And I don't think the penalty is completely proportional to resolution, but proportional to the data it needs to transfer that is in excess of the sli bridge's limits, which from the video is at 1440p@60 or fermi sli level performance. But I could be wrong on that too as I haven't seen the graph.
post #443 of 471
Quote:
Originally Posted by rluker5 View Post

Listening more closely, it seems I may have been wrong about the extent of difference between the new and old sli. The new one looks to be (650*2)/400 times as fast as the old, and the driver-card autodetects the bridge and switches how the cards communicate, so nvidia could give crappy sli support to all old setups, but they wouldn't have to do so on the basis of saving effort.
It seems that rep was just selling the old as new when he was describing how sli works at 3:05. If it is a differently configured signal then you would need a different part of the driver which is what I originally thought.
I didn't see the graph, your mention is all the information I have on it. And I don't think the penalty is completely proportional to resolution, but proportional to the data it needs to transfer that is in excess of the sli bridge's limits, which from the video is at 1440p@60 or fermi sli level performance. But I could be wrong on that too as I haven't seen the graph.
Maybe, maybe not, Probably have to get some more inside information to tell what else the bridge can be used for.
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post #444 of 471
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Originally Posted by CallsignVega View Post

Has this video been posted before? It is quite interesting:



The NVIDIA rep confirmed some of my suspicions. Basically, with me driving high resolution displays at high refresh rates, I haven't even been using the SLI bridges in my setups. All of the data has been going over my PCI-E bus. This explains why in my demanding scenarios, the differences in performance between 8x and 16x PCI-E were noticeable. This also explains why those that have tested with 1440p/60 Hz and below haven't seen much difference in PCI-E speed performance. The SLI bridge was utilized.

So now in theory, with the new HB SLI bridge will handle all traffic between the two cards and the PCI-E bus will only handle GPU to CPU communications, and not also GPU to GPU communications. Under this scenario, the benefit of having each GPU on it's own 16x PCI-E 3.0 bus will be much less critical. 8x may very well be about the same performance.

Also interesting to note, really only 2-way SLI is supported and 3/4 way SLI is just for bench-marking. Since going forward developers will have to be involved with SLI support and 3/4 way SLI setups being a incredibly small percentage, I highly doubt much 3/4 way support in the future for actual games.

I highly suspect that with the new HB SLI bridge and those running dual 8x slots for 2-way SLI, such as on a 1151 MB, will see a performance/smoothness boost if they run demanding display setups. thumb.gif

This also makes having X99 for 2-way SLI setups less warranted.

I did some of my own SLI testing on an X99 rig and I hope you are correct that the HB bridge will bring some SLI improvements.
http://www.overclock.net/t/1562717/x99-two-way-sli-testing-16x-16x-vs-16x-8x/0_100
post #445 of 471
Quote:
Originally Posted by Burke888 View Post

I did some of my own SLI testing on an X99 rig and I hope you are correct that the HB bridge will bring some SLI improvements.
http://www.overclock.net/t/1562717/x99-two-way-sli-testing-16x-16x-vs-16x-8x/0_100

Yes. In my testing I've found going from PCI-E 3.0 16x to 8x SLI dropped performance by 12% on average. In theory with the new bridge, the performance between the two should be pretty much identical. I plan on testing it.
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post #446 of 471
I'm a little late to the party.
Is pascal going to get "improved" sli support with their new sli bridge?
Or are they only going to provide sli support to pascal and cripple everything else in purpose?
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post #447 of 471
Quote:
Originally Posted by barsh90 View Post

I'm a little late to the party.
Is pascal going to get "improved" sli support with their new sli bridge?
Or are they only going to provide sli support to pascal and cripple everything else in purpose?
Pascal benefits from the new bridges, older cards continue to work like they do now.
Edited by TranquilTempest - 6/3/16 at 9:13am
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post #448 of 471
Quote:
Originally Posted by barsh90 View Post

I'm a little late to the party.
Is pascal going to get "improved" sli support with their new sli bridge?
Or are they only going to provide sli support to pascal and cripple everything else in purpose?

Please give one example of NVIDIA crippling performance on older cards, and keep in mind that crippling is not the same as no longer updating.
post #449 of 471
Quote:
Originally Posted by Oj010 View Post

Please give one example of NVIDIA crippling performance on older cards, and keep in mind that crippling is not the same as no longer updating.

Ok,let me rephrase that. No longer Optimizing with new drivers for new games...
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post #450 of 471
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Originally Posted by barsh90 View Post

Ok,let me rephrase that. No longer Optimizing with new drivers for new games...
This isn't even remotely related, it's more like complaining about USB2 ports not magically getting upgraded to USB3 the next time the manufacturer releases a new motherboard.
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