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2011/X79 and PCI-E 3.0 Question

post #1 of 7
Thread Starter 
So, according to Intel's website, the 2011 i7s have only PCI-E 2.0 controllers, and not 3.0. The X79 chipset also only lists PCI-E 2.0 support.

Yet the motherboards are listing PCI-E 3.0 lanes in the X79 motherboard.

I read a review or two (perhaps I should go back and read them again) where they compared PCI-E 2.0 and 3.0 on the X79 platform with a 7970.

I guess what I'm wondering is, how could they do this when the CPU and chipset both don't have PCI-E 3.0 lanes?
Even if there are PCI-E 3.0 switches, technically are they still not supported by the CPU and motherboard chipset?
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post #2 of 7
The reason behind the 2.0 labeling is because PCIe 3.0 cards weren't available at the time. So Intel put 2.0 as a filler. Motherboards companies also have revised their product listings for 3.0 support.

x79-block-diagram.jpg

I don't think 7970's (or 7xxx) scale as well as Nvidia with PCIe 3.0 x16.
post #3 of 7
Thread Starter 
OK, I'm still confused though. I thought it wasn't something you can just turn on and off with a bios setting, or can you?
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post #4 of 7
Quote:
Originally Posted by Kvjavs View Post

OK, I'm still confused though. I thought it wasn't something you can just turn on and off with a bios setting, or can you?

Some motherboards allow you to set the speed of PCI Express. By default it will run at 3.0. If you don't see such option in BIOS it is running at 3.0.
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post #5 of 7
Thread Starter 
OK, so as a recap, the actual controller is 3.0, although Intel lists it as 2.0 on their website and documentation?

And the motherboard will "unlock" it so it will work at 3.0 speeds?
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post #6 of 7
Correct. I believe most motherboard companies have added better support for 3.0. Before it would default to 2.0 and had the option to forcing it to 3.0 but sometimes wouldn't work. The newer BIOSes seem to have fixed that.
post #7 of 7
I have a asus deluxe x79 an 3930k can i run pci 3.0 whit my 7970 video card on this board thanks:thinking:
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