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How do things work with a PCI-E 3.0 mobo but a PCI-E 2.0 CPU (Any Pro's out there that know this info)

post #1 of 6
Thread Starter 
A lot of motherboard support pci-e 3.0 and soon there will be official pci-e 3.0 video cards out.
However, Sandy Bridge CPU's only support pci-e 2.0 in their expansion options.

Intel 2600K
http://ark.intel.com/products/52214/Intel-Core-i7-2600K-Processor-(8M-Cache-3_40-GHz)
Expansion Options
PCI Express Revision 2.0
# of PCI Express Ports 1

Intel 3930K
http://ark.intel.com/products/63697/Intel-Core-i7-3930K-Processor-(12M-Cache-3_20-GHz)
Expansion Options
PCI Express Revision 2.0
# of PCI Express Ports 10

My Questions:

1) Will I not be able to gain the benefits of pci-e 3.0 if I use one of the Sandy Bridge Processors above even if I have a pci-e 3.0 mobo and card?
2) Should I wait for an Ivy-E so I can get two pci-e 3.0 cards using two 16x lanes? (I know they run hotter so the OC on the processor will be less)
3) What does the # of PCI Express Ports mean? Is this essentially the number of PCI-E lanes that can be full 16x and hence why all the socket 1155's only have one 16x mode or two 8x/8x modes but the socket 2011 has multiple 16x modes?

Semi Off-Topic but part of purchasing decisions.
4)How much of a performance improvement is two identical cards running on two 16x lanes versus two 8x lanes?



PS: I will Only be using this for gaming and plan to run at 1920x1080 with full AA and max graphics when possible, I may run 3 monitors down the road some time when I save money up.
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post #2 of 6
1) No, it's processor dependent. Even if you have Z77 board or a Gen3 P67/Z68 board you have to have Ivy installed to make use of PCI-E 3.

2) I wouldn't.

3) No clue but those specs are wrong. Sandy Bridge-E (3820, 3930k, 3960kx) does support PCI-E 3.0 and can support two GPUs in x16/x16 or three in x16/x8/x8. Ivy Bridge supports two at x8/x8 PCI-E 3 and Sandy Bridge does x8/x8 PCI-E 2.0.

4) Not much difference at all. See here and just Google around.
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post #3 of 6
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post #4 of 6
1) no sandy bridge cpus dont have a PCIe 3.0 controller
2) if you doing heavy graphic intensive stuff and encoding or running multiple high res monitors maby
3) socket 2011 has many more PCIe lanes than socket 1155 hence more pins on the socket but most importantly it has the bus size to do x16 x16..
4) from what i hear minimal

atm tho PCIe 2.0 is more than enough and PCIe 3.0 branded cards will run on PCIe 2.0 smile.gif
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post #5 of 6
Thread Starter 
Awesome, Thank you to everyone for the quick responses and the links to the extra material. I"m checking out the HardOCP link now.
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post #6 of 6
Quote:
Originally Posted by Dopamin3 View Post

1) No, it's processor dependent. Even if you have Z77 board or a Gen3 P67/Z68 board you have to have Ivy installed to make use of PCI-E 3.
2) I wouldn't.
3) No clue but those specs are wrong. Sandy Bridge-E (3820, 3930k, 3960kx) does support PCI-E 3.0 and can support two GPUs in x16/x16 or three in x16/x8/x8. Ivy Bridge supports two at x8/x8 PCI-E 3 and Sandy Bridge does x8/x8 PCI-E 2.0.
4) Not much difference at all. See here and just Google around.

This is all correct. Only thing I would add is that in my opinion the socket 1155 ivy bridge would not be a bad choice if it is less than 15% more expensive than the comparable sandy bridge CPU.
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Overclock.net › Forums › Intel › Intel CPUs › How do things work with a PCI-E 3.0 mobo but a PCI-E 2.0 CPU (Any Pro's out there that know this info)