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[HWUnboxed]Nvidia’s HB SLI Bridge – Surprising gains! GTX 1080 SLI Testing Inside! - Page 17

post #161 of 169
Quote:
Originally Posted by andydabeast View Post

I think we are looking at this from the wrong perspective. The HD bridge does not give "gains". crappier ones give a loss. People should not be excited and happy that more expensive hardware is needed to get the most out of cards you already bought. No cards fully saturate pci-e 3 to 100% do they? The only reason Nvidia has built all this bridge nonsense into their cards is to get more money out of their customers. Another Nvidia tax.

Since we are sharing personal perspectives and not just facts here. My personal perspective on the subject is that this is a premium upgrade not a tax. A tax is something you have to pay for goods no matter what. We all know you can sli without it.

I compare it to a hotel room. You can get a perfectly good nights rest in a 89 dollar room but if you want a suite with a mini bar and sitting room you will need to pony up a little more. Both rooms have beds, you can sleep just fine in both rooms. This is not a tax. It is a room with more offered at a higher price for those who want it. Does the 89 dollar room give you a loss or does the higher priced room just give you extra?

Now as far as the "fully saturated" pci-e 3.0 lane goes you are correct. There is plenty of bandwidth on those lanes with the current standard to pass the sli data. The issue becomes latency while waiting on other traffic and getting the data back onto the main card for draw out to the monitor as there is no pathway to draw out directly to the monitor through pci-e.

Compare it to the road. Would you rather drive 35 down a road stretching a few miles that is traffic signal free or drive a 45 mph road that is slightly longer and has multiple stop lights along the way.

With todays games the number of times that draw calls are dropped from the render pipeline by the game for whatever reason is quite high. Adding just the smallest fraction of latency going through pci-e increase the chance the current draw is dropped. This causes micro stutter, loss of fps, and other visible odities in the output stream. The game will play just fine but... If you want the kitchenette and seating for visiters. You need the premium room imo
post #162 of 169
should I change the bridge on my sli ?
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post #163 of 169
I
Quote:
Originally Posted by T0B5T3R View Post

should I change the bridge on my sli ?

I would say probably not. Keep your current bridge but some form of info about your setup would help. smile.gif
post #164 of 169
Quote:
Originally Posted by emett View Post

10fps at 4k is a massive difference.

Yeah if you are struggling to hold 60fps

SIDE NOTE: I don't have that problem.
post #165 of 169
Anyone test out Surround with or without the HB bridges vs two ribbon ones? I've got two ribbons, and nothing works (3D apps/games) when surround have monitors on both cards... but works well when all three monitors are on just the top card. (2D desktop/apps work regardless) Just wanted to know if this instance, I would 'really; need the HB bridge.
post #166 of 169

Why don't they do SLI through the PCI-E slots like AMD? 

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post #167 of 169
i think the link thing will fix the pci bottleneck

probably one of the reasons that amd has issues with the driver efficiency in dx11, which requires more cpu cycles plus the bandwidth between the pci's-cpu.

i might be wrong lol
Edited by jmcosta - 8/30/16 at 6:14pm
post #168 of 169
Quote:
Originally Posted by Dragonsyph View Post

Why don't they do SLI through the PCI-E slots like AMD? 

Nvidia claim that using the PCIE lanes like AMD are doing, is going to add lag and is hitting the bandwidth issues, since higher performing card are starting to reach the PCIE 3 limited. Especially on motherboards and CPUs which aren't supporting full x16/x16.

So sticking to the bridge, they are not limited to either PCIE bandwidth or CPU and drivers to transmit the data between the GPUs. The CPU doesn't even need to be involved in the GPUs doing the syncing between them or for the GPU needing to do all the outputs, to be needing the CPU for it, since he gets it directly from the other GPU through the bridge.

While going through PCIE works well in many cases, it has been a somewhat issue in heavy load games on AMD cards, introducing extra stuttering compared to SLI.
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post #169 of 169
Check out Der8auer's youtube channel, he has 2 videos on the HB bridge with Xrays to show the traces.
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