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ASUS PCIe 3.0 Dual x16 support - conflicting information about the P8Z77 WS

Tags:
  • Asus
  • Gtx
  • Support
  • Titan
  • SLI
  • Motherboards
Last response: in Motherboards
April 7, 2013 10:28:45 AM

I'm building a new PC with a single GTX Titan. To ensure future upgrading I was looking for a motherboard that supported PCIe dual x16. I must admit I have no clue if a GTX Titan SLI on x16/x16 performs noticeable better than a on x8/x8 but given the 6 GB ram I'd rather be safe than sorry.

I was about to order the ASUS P8Z77 WS based on its specification on their website.

Quote:


https://www.asus.com/Motherboards/P8Z77_WS/#specificati...

But according to its manual page 2-7. It only supports SLI in x8/x8

http://dlcdnet.asus.com/pub/ASUS/mb/LGA1155/P8Z77-WS/Ma...

Quote:


So is this a typo either in the specs or in the manual or am I simply not understanding something about how graphic cards work in PCIe 3.0 SLI?

More about : asus pcie dual x16 support conflicting information p8z77

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April 8, 2013 7:05:10 AM

The only LGA 1155 board the I have been able to spec out with dual 16 x 16 PCI lanes is : http://www.asrock.com/mb/Intel/Z77%20WS/index.us.asp?ca.... There are several choices for dual 16 X laned motherboards in LGA 2011, but that is a different platform, with more PCIe lanes. The only reason that the ASRock Z77 WS can use dusl 16 X lanes is because of the PLX PEX 8747 bridge. Normally the LGA 1155 chipset is limited to 24 (or 23) PCIe lanes and you need a bridge chip to get more. Look at this discussion for further info: http://www.overclock.net/t/1267524/how-many-16x-pcie-sl....

Also, as I understand it the PCIe lanes are limited to the 2.0 rather than the 3.0 spec. So you will have to await new designs for a LGA 1155 to use dual PCIe 16 X at the PCI 3.0 spec. As the IB platform is coming to eol status you may need to go to a Haswell CPU for dual PCIe 16 X on the 3.0 standard.
April 8, 2013 11:21:28 AM

chesteracorgi said:
The only LGA 1155 board the I have been able to spec out with dual 16 x 16 PCI lanes is : http://www.asrock.com/mb/Intel/Z77%20WS/index.us.asp?ca.... There are several choices for dual 16 X laned motherboards in LGA 2011, but that is a different platform, with more PCIe lanes. The only reason that the ASRock Z77 WS can use dusl 16 X lanes is because of the PLX PEX 8747 bridge. Normally the LGA 1155 chipset is limited to 24 (or 23) PCIe lanes and you need a bridge chip to get more. Look at this discussion for further info: http://www.overclock.net/t/1267524/how-many-16x-pcie-sl....

Also, as I understand it the PCIe lanes are limited to the 2.0 rather than the 3.0 spec. So you will have to await new designs for a LGA 1155 to use dual PCIe 16 X at the PCI 3.0 spec. As the IB platform is coming to eol status you may need to go to a Haswell CPU for dual PCIe 16 X on the 3.0 standard.


Yeah, I went to the ASUS support forum (which is damn near impossible to find btw) and they confirmed that it didn't truly support x16/x16 in PCIe 3.0. I just wanted the option of GTX Titans in dual 16x/x16 if possible in the future but I'm not willing to go LGA 2011 to get there. Thanks for your input