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Will a cpu that's only compatible with pcie 2.0 run a 3.0 card?

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a b à CPUs
February 5, 2013 12:44:49 AM

I know that pcie cards are backwards compatible, but the new processor I want is for the x79 chipset. It currently says it only supports PCIe 2.0. Does that mean my card will run at 2.0 speeds or not run at all?

http://ark.intel.com/products/63698/Intel-Core-i7-3820-...
a b à CPUs
February 5, 2013 12:59:06 AM

That cpu supports pcie 3.0, it depends on the motherboard, but it's compatible with 3.0/2.0 pcie
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a c 133 à CPUs
February 5, 2013 12:59:35 AM

pci-express is backwards compatible.

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a b à CPUs
February 5, 2013 1:12:18 AM

djangoringo said:
That cpu supports pcie 3.0, it depends on the motherboard, but it's compatible with 3.0/2.0 pcie


If I look halfway down the page it says it supports only 2.0? where did you see 3.0?
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a b à CPUs
February 5, 2013 1:15:40 AM

http://www.guru3d.com/articles_pages/core_i7_3820_proce...


"The chip features four computing cores with Hyper-Threading support working at 3.6GHz (3.8GHz max Turbo), 10MB of Level 3 cache memory, a quad-channel memory controller, and a built-in 40-lane PCI Express 3.0 controller."


At the time it was posted there was no motherboard with pcie 3.0
Now there's a lot of them with pcie 3.0
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a c 133 à CPUs
February 5, 2013 1:32:38 AM

anyways is supports 3.0 even if it dint. pci-express 3.0 2.0 are compatible with 1.0

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a b à CPUs
February 5, 2013 1:39:31 AM

He's saying if it will run at 3.0 speeds, or at 2.0, it will run at 3.0 with pcie 3.0 motherboard x79, it's not official supported, but the i7-3820 can run pcie 3.0, but for now it's worthless, there's no card that take advantage of pcie 3.0, so any pcie 2.0 will run the pcie 3.0 top cards at maximum capability.
Probably in the future, some cards will really take advantage of the pcie 3.0
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a c 133 à CPUs
February 5, 2013 1:41:07 AM

oh misunderstood. but doesnt the mobo give u the option of pciexpress 3.0 or 2.0. dint know it was cpu bound.

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a b à CPUs
February 5, 2013 2:18:10 AM

It's also cpu bond, if the cpu doesn't have a pcie 3.0 controller, it won't run at 3.0 on a motherboard with pcie 3.0 slots.
But then again, for now, there's no card that takes advantage of the pcie 3.0, so either running it at 3.0 or 2.0 will give the same performance.
http://tpucdn.com/reviews/Intel/Ivy_Bridge_PCI-Express_...
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a c 133 à CPUs
February 5, 2013 3:58:39 AM

thanks for clearing that up, i usually just buy a card thats pci express and works out of the box. also games barely are if anything faster on pci-e 2.0 than 1.0 so 3.0 is irrelevant at this point

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a b à CPUs
February 5, 2013 9:26:37 PM

Thanks for the help. My card is the 660ti and its made for pcie 3.0. there wasnt going to be a big performance hit running at 2.0 speeds. I just wanted to make sure the card would still work. The mobo has 3.0 slots. i was just worried about the cpu.
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a b à CPUs
February 5, 2013 9:36:56 PM

It's fine, pcie 3.0 is backwards compatible with previous versions, and there's no loss of performance, see the posts above.
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a c 133 à CPUs
February 5, 2013 10:20:45 PM

ditto

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