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NVIDIA'S ANSWER TO X79 AND PCI-e3

Wait, so their drivers forces it to run in 2.0 on X79 boards? And they need to run the exe for it to run 3.0...?

Seems a silly thing to do...
 
Well it relates to x79 not being native pci-e3 so this is a work around for boards that are not able to fully support it, hardly Nvidias fault.
 
Don't see the problem.

So they are not supporting it, but at least they gave a simple way to enable.

Pity they don't do the same with things like using gpu for physx when using amd as main gpu.

Not that it really matters to me any more... which reminds me, I must try a physx title.
 
From what I've read it's only 670/680's thats affected
Click to expand...

Thats the bit I find strange. A GTX 690 is 2 GTX 680s on the same card. So what is the problem with running 1 GTX 680 @pci-e3 if 2 on a card have no problem. If you disable sli a gtx 690 turns into a 680.
 
Because it's the PEX8747 PCIe switching hardware chip that handles the PCIe 3.0 data on board for SLi.

tommybhoy said:
Users of systems running Core i7 processors in the LGA2011 package and X79 chipset motherboards will find that their GeForce GTX 680 will not run at PCI-Express 3.0 x16 mode, using launch drivers. This is because NVIDIA decided against implementing Gen 3.0 support for the new GPU on X79/SNB-E systems, at the very last moment. Pre-launch drivers, including the driver that ships on discs with the graphics cards, and review drivers (which cannot be distributed), will let the GPU run at Gen 3.0 mode on some X79/SNB-E systems, however the post-launch stable drivers (such as GeForce 301.10 WHQL), won't.

The specifications page of GeForce GTX 680 on GeForce.com has been updated to mention this:
GeForce GTX 680 supports PCI Express 3.0. The Intel X79/SNB-E PCI Express 2.0 platform is only currently supported up to 5GT/s (PCIE 2.0) bus speeds even though some motherboard manufacturers have enabled higher 8GT/s speeds.

Sources in the PC motherboard industry we spoke with, confirmed this change. PCI-Express 3.0 x16, for now, might only run on upcoming "Ivy Bridge" Core systems, running on motherboards with PCI-Express 3.0 compliant components. NVIDIA could be working to fix the issue.'

http://www.techpowerup.com/162942/G...-Express-to-Gen-2.0-on-X79-SNB-E-Systems.html

Don't think it much of an issue myself but just thought I would give a heads up.
Click to expand...

At least they implemented a workaround, simple enough to enable.
 
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Kaapstad said:
Thats the bit I find strange. A GTX 690 is 2 GTX 680s on the same card. So what is the problem with running 1 GTX 680 @pci-e3 if 2 on a card have no problem. If you disable sli a gtx 690 turns into a 680.
Click to expand...

The 690 will have some sort of PCI-E bridge chip which will no doubt have some sort of positive influence on the issue.
 
This looks to be a problem with X79 & PCI-E 3.0, at some point Intel have turned around and downgraded it to only PCI-E 2.0 certification... why?

Some relevant info:

Another bone of contention that has been laid to rest is the fact the Sandy Bridge-E processors feature PCIe Gen 3 as its controller is 8 GT/s-capable; however, the validation of PCIe Gen 3 capable switching components amongst motherboard manufacturers seem to have started a war of words between two prominent board makers. Hence, Intel has seemingly decided to err on the side of caution and kept mum on their PCIe Gen 3 capabilities as evident in the X79 chipset block diagram.

As seen from the block diagram above, there is still no official word on its support for PCIe Gen 3.0 though motherboard makers have implemented their own compliant switching components on their X79 offerings.
Click to expand...
 
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Same here on my x79/690 setup

x79pcie3.jpg


When i had the asus sabertooth were it says pcie3 it was pcie 2,so am i running pcie 3 ?
 
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tommybhoy said:
Because it's the PEX8747 PCIe switching hardware chip that handles the PCIe 3.0 data on board for SLi.
Click to expand...

If this is entirely the reason, then why do 690's appear as pcie2.0 on non IB/2011 motherboards

what is really galling about this whole thing is that clearly they've tested some motherboards and found some to work and some not but they won't even tell us which ones they've tested
 
From what I can gather the issue is that X79 doesn't officially support PCI-E 3.0 (news to me) and X79 motherboard manufacturers have been using different switching components to implement their own unofficial 8GT/s support.

As a result of this not all X79 are motherboards are guaranteed to run stable at 8GT/s and it will reflect badly on NVidia's PCI-E 3.0 cards which may be unstable through no fault of their own, there's no reason why it won't affect AMD's PCI-E 3.0 cards either except that they aren't quite as on the ball as usual. I don't see why GTX690 would be immune either since the issue lies between the CPU/PCI-E slot on the motherboard.

NVidia are basically saying that their GPU's are 100% compatible with the SIG PCI Express Specification, whereas a lot of X79 motherboards aren't which is likely to cause issues.
 
andybird123 said:
what is really galling about this whole thing is that clearly they've tested some motherboards and found some to work and some not but they won't even tell us which ones they've tested
Click to expand...

I totally agree that they should start being more informative on the problems instead of alienating their customers, very bad business practice imo...

I noticed last night they have started deleting complaints from their forum much the same as AMD are known to do in their forum.:(

The stutter thread went from 83 to 81 pages long yesterday and one user with 680 SLi re-posted his post but it got deleted again, he then went on to say:

'AKA deleting replies from people who realize this fix didn't fix anything. I have two GTX 680's and the stutter. My reply was not inappropriate yet it's gone. Putting a product out for $1000 dollars that doesn't work the way its supposed to is ridiculous. Normal vsync working properly is an absolute must. Adaptive vsync = random patches of tearing and either way it was supposed to be an optional FEATURE not a mandatory fix for a problem that wasn't corrected before the card was released. Most reply's that show that the fix you guys have been promising does not fix anything have been "cleaned" up. This will be deleted too but I'm pretty sure everyone on here see's what's going on here at this point anyway. The "cleaning" is more for the people who are reading this and considering picking up a 680. Not the people who already did and are stuck with them. Time to play on my 4k setup and feel my brain melt from stutter, fps drops, and multi monitor non surround flicker during web browsing. Hurray. '
http://forums.nvidia.com/index.php?showtopic=226227&view=findpost&p=1424284

Nvidia are having problems with the 6 series, whether it's hardware/driver related remains to be seen, it's very uncharacteristic, but nonetheless it's happening.
 
This will probably affect a lot of Z68 motherboards as well, those that advertised Gen 3 support months before IB was even released.

I'm presuming Z77/H77 etc are the only officially compliant PCI-E 3.0 platforms with all the others having an unofficial implementation which may suffer with these same timing issues depending on which switching components they use.
 
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