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Is this compatable?

Hi folks. Here is my current setup.

I7-2700k @ 4500
H100 Cpu Cooler
Asrock Z77 Pro4 Mobo
16GB Crucial 1600mhz RAM
Intel 256GB Solid State
Seasonic X650 80+ Gold PSU
GTX 560Ti GPU

Im looking to pick up a GTX 670 to replace the 560Ti. But... I have a sandy bridge CPU on a Z77 platform so I know that PCI E 3.0 isnt supported by the CPU. So (from what i understand) the slot will run at 2.0 speeds. Now from what Ive seen here and there the GTX 670 or even 680 will not bottleneck a PCI 2.0. Can you guys help confirm this for me? With my setup? Ive seen such confusing info as this was my first build. "PCI E 3.0x16 will run at 2.0 with a sandy bridge"... I need some clarification on all this in simple terms where possible. Thanks alot guys.
12 answers Last reply Best Answer
More about compatable
  1. Bottlenecking will not be an issue with this config. Yes, PCIe 3.0 is backward compatible and the PCIe 2.0 speeds will not affect the performance in any measurable fashion.

    Press on and have fun!
  2. mojin77 said:
    Hi folks. Here is my current setup.

    I7-2700k @ 4500
    H100 Cpu Cooler
    Asrock Z77 Pro4 Mobo
    16GB Crucial 1600mhz RAM
    Intel 256GB Solid State
    Seasonic X650 80+ Gold PSU
    GTX 560Ti GPU

    Im looking to pick up a GTX 670 to replace the 560Ti. But... I have a sandy bridge CPU on a Z77 platform so I know that PCI E 3.0 isnt supported by the CPU. So (from what i understand) the slot will run at 2.0 speeds. Now from what Ive seen here and there the GTX 670 or even 680 will not bottleneck a PCI 2.0. Can you guys help confirm this for me? With my setup? Ive seen such confusing info as this was my first build. "PCI E 3.0x16 will run at 2.0 with a sandy bridge"... I need some clarification on all this in simple terms where possible. Thanks alot guys.


    There is an aberage difference of 1% faster on pci e 3.0. You will notice no speed bumps or anything. Youll notice a huge speed difference with the 670 shoot for it
  3. You're dead on. No, you can't get PCIe 3.0 without an IVB CPU. But it doesn't matter, because the card doesn't need the extra bandwidth. Even a GTX 690 works just fine in a 2.1 slot.
  4. Awesome. So its not like the slot will be x8 or x4 or something silly that will kill my gains? Thats great news. Thanks alot for the quick replies too. I assume power should be sufficient as well? I purposely bought the seasonic to handle one beast card. Not SLI or anything but it should be good too right?
  5. mojin77 said:
    Awesome. So its not like the slot will be x8 or x4 or something silly that will kill my gains? Thats great news. Thanks alot for the quick replies too. I assume power should be sufficient as well? I purposely bought the seasonic to handle one beast card. Not SLI or anything but it should be good too right?


    Well keep it an x16 slottt for more bandwith. And seasonic is numero uno in power supllies how many watts
  6. The Seasonic x650 is a GREAT choice. It will handle all of your power needs well.
  7. hbeduryan818 said:
    Well keep it an x16 slottt for more bandwith. And seasonic is numero uno in power supllies how many watts


    When you say keep it at a x16 slot... how so. You can change the slots bandwidth? I thought i had read somewhere that the slot would act differently with a sandy bridge other then just changing to a PCI E 2.0
  8. mojin77 said:
    When you say keep it at a x16 slot... how so. You can change the slots bandwidth? I thought i had read somewhere that the slot would act differently with a sandy bridge other then just changing to a PCI E 2.0


    Well your mobo should have a pci e 2.0 x16 slot......
  9. hbeduryan818 said:
    Well your mobo should have a pci e 2.0 x16 slot......


    It actually has a 3.0x16 slot. Here is a list of slots. This is why im confused still.

    - 1 x PCI Express 3.0 x16 slot (PCIE2: x16 mode)
    - 1 x PCI Express 2.0 x16 slot (PCIE3: x4 mode)
    - 1 x PCI Express 2.0 x1 slot
    - 3 x PCI slots

    If this were true I could SLI if i wanted to. But you cant with this board. This is from the manufactures sites on my specific board.
  10. mojin77 said:
    It actually has a 3.0x16 slot. Here is a list of slots. This is why im confused still.

    - 1 x PCI Express 3.0 x16 slot (PCIE2: x16 mode)
    - 1 x PCI Express 2.0 x16 slot (PCIE3: x4 mode)
    - 1 x PCI Express 2.0 x1 slot
    - 3 x PCI slots

    If this were true I could SLI if i wanted to. But you cant with this board. This is from the manufactures sites on my specific board.


    You could plug it im for pci e 2.0 or 3.0 x16 but you wont get the 3.0 advatage so either one will work
  11. Best answer
    mojin77 said:
    It actually has a 3.0x16 slot. Here is a list of slots. This is why im confused still.

    - 1 x PCI Express 3.0 x16 slot (PCIE2: x16 mode)
    - 1 x PCI Express 2.0 x16 slot (PCIE3: x4 mode)
    - 1 x PCI Express 2.0 x1 slot
    - 3 x PCI slots

    If this were true I could SLI if i wanted to. But you cant with this board. This is from the manufactures sites on my specific board.

    Replace every 3.0 and 2.0 with 2.1, and that's how your board behaves. If you ever put an IVB chip in, your 3.0 slots will suddenly start acting like 3.0 slots. Until then, everything is 2.1.

    As far as how many lanes, it's simple. The top slot is pretty much always an x16 slot, so you put your video card there. If you add a second one, the available lanes either get split or the second card gets a reduce number while the first gets a full x16. Typically the cards will go into x8/x8 mode, x16/x8 or x16/x4. You'll get the overwhelming majority of the performance regardless of how the slots get configured.
  12. Best answer selected by mojin77.
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