Thursday, June 21st 2012

NVIDIA Releases PCI-Express Gen 3.0 Enabling Patch for Sandy Bridge-E HEDT Platform

Although pre-launch drivers of the GeForce GTX 680 let the GPU run in PCI-Express Gen 3.0 mode on Intel's Sandy Bridge-E HEDT (X79) platforms, the release drivers limited the GPU to PCI-Express Gen 2.0 on the platform. The issue carried on with GeForce GTX 670, and other graphics cards with "Kepler" family of GPUs. NVIDIA cited reasons such as the platform not being PCI-Expres Gen 3.0 "certified" although it supports the 8 GT/s mode. The company assured users that it was working on getting its hardware to work on the Sandy Bridge-E HEDT platform in Gen 3.0 mode, and until it's absolutely certain about reliability, it is forcing PCI-Express Gen 2.0 mode.

NVIDIA released a patch that enables PCI-Express Gen 3.0 mode on Intel Sandy Bridge-E HEDT (X79) platforms, which lets graphics cards based on GeForce Kepler GPUs, such as GeForce GTX 680, GTX 670, etc., take advantage of 8 GT/s per lane system interface bandwidth. The mode could come particularly handy for graphics cards that are installed on electrical PCI-Express 3.0 x8 slots, as they could end up with bandwidth comparable to that of PCI-Express 2.0 x16. The patch should be installed along with the latest stable drivers. To enable the patch, run the executable and reboot the system. To undo the patch later, run the same executable with "-revert" argument in Command Prompt. Use only if stability is not absolutely paramount, or if the hardware is not operating in a mission-critical environment.

DOWNLOAD: NVIDIA GeForce Kepler PCIe 3.0 mode-enabling patch for Sandy Bridge-E systemsSource: NVIDIA
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26 Comments on NVIDIA Releases PCI-Express Gen 3.0 Enabling Patch for Sandy Bridge-E HEDT Platform

#1
Aquinus
Resident Wat-man
Took long enough? At least they're working on it.:cool:
Posted on Reply
#2
Rahmat Sofyan
I wonder is it kepler really built with Pciex 3.0 or what?
Or just tweaking chip from fermi and indeed still use Pciex 2.0 technology?
Posted on Reply
#3
btarunr
Editor & Senior Moderator
by: Rahmat Sofyan
I wonder is it kepler really built with Pciex 3.0 or what?
Or just tweaking chip from fermi and indeed still use Pciex 2.0 technology?
Kepler is a PCI-Express 3.0 GPU, which runs in Gen 3.0 mode on PCIe 3.0 certified systems (Ivy Bridge).
Posted on Reply
#4
Aquinus
Resident Wat-man
by: btarunr
Kepler is a PCI-Express 3.0 GPU, which runs in Gen 3.0 mode on PCIe 3.0 certified systems (Ivy Bridge).
I was under the impression that IVB and SB-E both weren't PCI-E 3.0 certified, but could run 3.0 speeds according to Intel.
Posted on Reply
#5
Steven B
the real truth is that NVIDIAs/ATIs GPUs don't correctly abide by PCI-E gen 3 specs an that intel's CPUs don't either, at least that is according to PLX they are the only ones who correctly abide by PCISIG.
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#6
Dj-ElectriC
Does it really matter when the differences between X16 of 2.0 and 3.0 are that irrelevant to all of the GPUs anyway?
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#7
cadaveca
My name is Dave
by: Aquinus
I was under the impression that IVB and SB-E both weren't PCI-E 3.0 certified, but could run 3.0 speeds according to Intel.
IVB is PCIe 3.0. SB-e..not so much, but it's possible. Not all chips can run it, apparantly.

by: Dj-ElectriC
Does it really matter when the differences between X16 of 2.0 and 3.0 are that irrelevant to all of the GPUs anyway?
I've seen some very interesting stuff with PCIe 3.0 and multi-GPU. Like 30-40 % gains. I do not know if the same still holds true though.
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#8
Dj-ElectriC
I haven't, not with 680s or 7970s anyway
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#9
cadaveca
My name is Dave
by: Dj-ElectriC
I haven't, not with 680s or 7970s anyway
you ran 3 + cards? It's only there that it shows. I've been looking for someone else to run these tests, but have not found anyone. I've tried to get cards too ,as you know, but spending that much money on cards doesn't make sense to me, personally, as I want GTX690!

The story goes that the loss of scaling when adding third/fourth cards is due to lack of bandwidth to the GPUs, and between them. But it was done on SB-E, which is not exactly "certified" for PCIe 3.0, so noone knows exactly what the story is here, and what is going on.
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#11
cadaveca
My name is Dave
Yes, that's it! Thanks, Fluffy. ;)

So, I wonder if this still holds true, or if that was part of the hack to get PCIe 3.0 as it was driver disabled...

(I saw his post on XS).

Need someone with 4 cards and 3 monitors to do some testing, or someone to loan me 4 cards of GTX680, and 4 of HD7970!


:roll:
Posted on Reply
#12
Steven B
yea it also probably depends on your screen res, Vega runs very big
Posted on Reply
#15
eidairaman1
"To undo the patch later, run the same executable with "-revert" argument in Command Prompt. Use only if stability is not absolutely paramount, or if the hardware is not operating in a mission-critical environment."

Why wouldnt stability be paramount in any machine?
Posted on Reply
#16
cadaveca
My name is Dave
by: eidairaman1
"To undo the patch later, run the same executable with "-revert" argument in Command Prompt. Use only if stability is not absolutely paramount, or if the hardware is not operating in a mission-critical environment."

Why wouldnt stability be paramount in any machine?
Some prefer performance. See any extreme benchmarking user running LN2. ;)

See, the story is that not all Intel SB-e CPUs are actually capable of running the PCIe domain at PCIe 3.0 speeds. They are all capable of running the encoding method, just not the frequency.


Because of this, it is impossible for nVidia to guarantee that a user's CPU is capable. There is a good chance that it will be, but without Intel confirming PCIe 3.0 for all CPUs(and Intel does not, specifically stating that all amy not run proper speed), there is no way nVidia could provide this "fix" without that little disclaimer.

Now, if the above posted info aobut PCIe 3.0 and multi-GPU has any rel merit, it would really make some sense for nV to provide this patch ASAP, and this really seems to have been what they have done.
Posted on Reply
#17
newtekie1
Semi-Retired Folder
by: Steven B
the real truth is that NVIDIAs/ATIs GPUs don't correctly abide by PCI-E gen 3 specs an that intel's CPUs don't either, at least that is according to PLX they are the only ones who correctly abide by PCISIG.
At least when it comes to nVidia cards, they do have the PCI-E 3.0 Logo on them, so they are certified by PCISIG. I'm not sure about AMD, but AFAIK it is only Intel's platform that isn't PCISIG certified which is why they can't say PCI-E 3.0.
Posted on Reply
#18
makwy2
Damn it Nvidia! You shouldn't be enabling people!
Posted on Reply
#19
Xzibit
by: newtekie1
At least when it comes to nVidia cards, they do have the PCI-E 3.0 Logo on them, so they are certified by PCISIG. I'm not sure about AMD, but AFAIK it is only Intel's platform that isn't PCISIG certified which is why they can't say PCI-E 3.0.
I dont think there ever been a official PCI-E 2.0 or 3.0 logo. Just the PCI Express logo.

Both Nvidia and AMD AIBs just slap the PCI-Express (Basic) logo somewhere on the box (Side or Back). Just look at Wizzard reviews for packaging screenshots.

Motherboards are different. Each motherboard maker has their own take on the PCI-E logo. Usually its the official PCI Express (Grey Frame) logo with a gen # added to it on the side or bottom.
Posted on Reply
#20
newtekie1
Semi-Retired Folder
by: Xzibit
I dont think there ever been a official PCI-E 2.0 or 3.0 logo. Just the PCI Express logo.

Both Nvidia and AMD AIBs just slap the PCI-Express (Basic) logo somewhere on the box (Side or Back). Just look at Wizzard reviews for packaging screenshots.

Motherboards are different. Each motherboard maker has their own take on the PCI-E logo. Usually its the official PCI Express (Grey Frame) logo with a gen # added to it on the side or bottom.
There is a PCI-E 3.0 logo, it is just the PCI-E Logo with a 3.0 after it, and the card has to be PCISIG certified to have that logo. For them to legally say the card is PCI-E 3.0 the card has to be PCISIG certified. That is why Intel can't advertise their platform as PCI-E 3.0, it isn't PCISIG certified.
Posted on Reply
#21
Xzibit
Pretty sure there is no numeric logo for PCI Express

There is no mention of numeric PCI Express logo on the site nor on there guildline use of logos
Guidelines and usage says basic logo is acceptable for compliance with 1.0 spec and higher. So according to them thats there only PCI Express logo.

PCISIG Log and Guildelines

If a company chooses to add a number seperate from the logo thats just not part of the certification.
The consumer would have to look them up on the list for 3.0 certification not look for a logo on the box.
Posted on Reply
#22
newtekie1
Semi-Retired Folder
by: Xzibit
Pretty sure there is no numeric logo for PCI Express

There is no mention of numeric PCI Express logo on the site nor on there guildline use of logos
Guidelines and usage says basic logo is acceptable for compliance with 1.0 spec and higher. So according to them thats there only PCI Express logo.

PCISIG Log and Guildelines

If a company chooses to add a number seperate from the logo thats just not part of the certification.
The consumer would have to look them up on the list for 3.0 certification not look for a logo on the box.
The part I'm talking about is covered on page 6 of their Guidelines, that states a product can't claim it is compliant with PCISIG standards unless the product in question has passed all compliance testing related to the specification. So, while there isn't a specific 3.0 logo, the product can't use the term PCI-E 3.0 anywhere, even in the documentation, unless it has passed PCISIG compliance testing. NVidia cards use PCI-E 3.0 in their packaging and documentation, which means they passed the compliance tests, and again I'm pretty sure AMD cards are the same. Intel's platform has not and hence you won't see PCI-E 3.0 anywhere in Intel's documentation or packaging. Basically the words "PCI-E 3.0" becomes the logo I was talking about.
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#23
Limoges_Gamer
Does this modify the video driver? So, uninstalling the video driver, and reinstalling it would also undo this executable, right?
Posted on Reply
#25
-Catch
Will my i7-2600 sandybridge work with a GTX 750TI that requires PCI-e 3.0 ??? Im a complete PC noob btw :confused:
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