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Does 3930K support PCI-E 3.0 x16 properly?

post #1 of 6
Thread Starter 
Hi,

I am planning to buy X79 platform with 3930K (4930K very hard to find in my country) but I just read something about Sandy Bridge-E not supporting PCI-E 3.0 natively and people having issues. I plan to run GTX 1080 SLI on it and I don't want to pay for X99 platform with 40-lane CPU that would cost me 5 times more that used X79+3930K.

Whole point of going for this platform is being able to run those cards at x16/x16 PCI-E 3.0 and now I see that it may not work...

There are quite a mixed reports on that, what's the truth?
post #2 of 6
That is a PCIe 2.0 CPU.

https://ark.intel.com/products/63697/Intel-Core-i7-3930K-Processor-12M-Cache-up-to-3_80-GHz


The one thing I don't know is if you'll actually see a measurable different between PCIe 2.0 x16/x16 vs PCIe 3.0 x16/x16 in terms of gaming.
Edited by RadActiveLobstr - 2/13/17 at 8:26am
    
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CPUMotherboardGraphicsGraphics
i7-5930k ASUS X99-Deluxe Gigabyte GTX980 G1 Gaming Gigabyte GTX980 G1 Gaming 
RAMHard DriveHard DriveHard Drive
G.SKILL Ripjaws 4 Series 16GB Samsung 840 Pro 256GB Sandisk Ultra II 960 GB WD Black HDD 2TB 
Hard DriveHard DriveOptical DriveCooling
WD Black HDD 1TB WD Blue HDD 500GB LG Bluray Drive/Rewriter Corsair H105 
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KeyboardPowerCaseMouse
Corsair K95 RGB Cherry MX Brown EVGA Supernova 1000 P2 CaseLabs S8S Corsair Scimitar  
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by RadActiveLobstr View Post

The one thing I don't know is if you'll actually see a measurable different between PCIe 2.0 x16/x16 vs PCIe 3.0 x16/x16 in terms of gaming.

There is a myth and misinformation that goes on and on in every thread like that, that there is no difference, while there is very significant one in many cases. Here:

https://www.youtube.com/watch?v=rRyFGoDVr28
https://www.youtube.com/watch?v=8KOTiee5RqA&t=336s

There would be no point in investing in 6-year old platform if PCI-E bandwidth didn't matter, I would just upgrade do 4790K or 5775C and be done with it at a small cost. But the point is that I need x16/x16 and I don't want to play crazy money for 6850K+X99+DDR4 just because of PCI-E lanes, so I looked at X79.
Edited by Krzych04650 - 2/13/17 at 8:38am
post #4 of 6
Thread Starter 
By the way, the correct answer from Nvidia website:
Quote:
GeForce GTX 600 series (Kepler class) and higher GPUs support PCI Express 3.0. They operate properly within the SIG PCI Express Specification and have been validated on multiple PCI Express 3.0 platforms. Some motherboard manufacturers have released an updated SBIOS to enable the Intel X79/SNB-E PCI Express 2.0 platform to run at up to 8GT/s bus speeds. We have tested GeForce GTX 680 and GTX 670 GPUs across a number of X79/SNB-E platforms at 8GT/s bus speeds, but have seen significant variation in signal timing across different motherboards and CPUs. Therefore we’ve decided to only support and guarantee PCI Express 2.0 bus speeds on X79/SNB-E with our standard release drivers. Native PCI Express 3.0 platforms (like Ivy Bridge) will run at 8GT/s bus speeds with our standard release drivers.

Though we cannot officially support or guarantee 8GT/s speeds for X79/SNB-E, you can manually enable faster 8GT/s bus speeds (at your own risk) using the following executable: force-enable-gen3.exe

If you would like to revert back to 5GT/s bus speeds you can do so by running the following command from the DOS command line: “force-enable-gen3.exe –revert”

You may download "force-enable-gen3.exe" from the File Attachments section below. You will need to reboot your system for the changes to take effect.

https://nvidia.custhelp.com/app/answers/detail/a_id/3135/~/geforce-gen3-support-on-x79-platform
post #5 of 6
Xeon E5-1650 (3930k) supports pci-E 3.0 natively.

$100 on ebay all day long.
post #6 of 6
Thread Starter 
Quote:
Originally Posted by MrTOOSHORT View Post

Xeon E5-1650 (3930k) supports pci-E 3.0 natively.

$100 on ebay all day long.

Yes, I will look into getting this one or 4930K if X299 doesn't deliver in terms of price.
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