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Z77 x16 or x4????????

Hi Guys,

I am bit confused about the new Z77 boards. Particularly this board : Asus P8Z77-V-LX 32GB DDR3 Intel Motherboard.

Have a look at this link.

http://www.theitdepot.com/details-Asus+P8Z77-V-LX+32GB+DDR3+Intel+Motherboard_C13P13957.html

And on that page click on the "features" tab. It says that it has the following expansion slots. I quote below.
Expansion Slots.

- 1 x PCIe 3.0/2.0 x16 (blue) *2
- 1 x PCIe 2.0 x16 (x4 mode, black)
- 2 x PCIe 2.0 x1
- 3 x PCI

What does the first line mean? If you use two 7870's(which are PCIe 3.0), will they be supported at PCIe 2.0 X4 speeds or PCIe 2.0 X16 speeds?

Am I correct? Pretty confusing......:-( . If some one could clear this up it would be brilliant!!!!

Thanks for the help in advance guys....
8 answers Last reply Best Answer
More about tomshardware
  1. That board can't run both cards at their max potentials. By any chance do you have the asrock z77 pro 3 or pro 4? They both support crossfire/sli at higher bandwiths than the v-lx.

    If not, get this board: http://www.theitdepot.com/details-Asus+P8Z77-M-PRO+32GB+DDR3+Intel+Motherboard_C13P13956.html it can run both of your cards to their full potential.
  2. amuffin said:
    That board can't run both cards at their max potentials. By any chance do you have the asrock z77 pro 3 or pro 4? They both support crossfire/sli at higher bandwiths than the v-lx.

    If not, get this board: http://www.theitdepot.com/details-Asus+P8Z77-M-PRO+32GB+DDR3+Intel+Motherboard_C13P13956.html it can run both of your cards to their full potential.


    Wont the PCIe 2.0 x16 still be enough for 2 7870's? I have read somewhere that no cards can saturate PCIe 2.0 x16 even now. In fact even x8 x8 configs work well.

    So does the original board I have pointed to really run two 3.0 cards in PCIe 2.0 x16 speeds?

    Sorry for the multiple questions mate.
  3. Best answer
    You are going to have 2 cards run at x4 if you use that board. That is because one slot is a x4 and the other is an x16!
  4. So this line is basically wrong I guess???

    1 x PCIe 3.0/2.0 x16 (blue) *2
  5. Best answer selected by mailpranshu.
  6. Sorry, thought I'd reply on this even though it's closed, from the way a lot of the info is saying PCIe 3.0 x4 is equal to PCIe 2.0 x8 and so on (x8 equal to x16), but only If you're using an Ivy Bridge processors.
  7. SherwoodForest said:
    Sorry, thought I'd reply on this even though it's closed, from the way a lot of the info is saying PCIe 3.0 x4 is equal to PCIe 2.0 x8 and so on (x8 equal to x16), but only If you're using an Ivy Bridge processors.


    Bro wtf......are you sure???/ That would save so many people so much of a problem.!!!!!

    Can you confirm and post links?
  8. There are no cards that utilize the pcie 2.0 slot entirely. So PCIE 3.0 Is useless for gaming, and anything until say the next 3-5 years.
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