PCIe Lanes Question

[stahlhart]

Here is a portion of the specifications for the Gigabyte GA-PA67A-UD4:

1. 1 x PCI Express x16 slot, running at x16 (PCIEX16)
   * For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot.
2. 1 x PCI Express x16 slot, running at x8 (PCIEX8) * The PCIEX8 slot shares bandwidth with the PCIEX16 slot. When the PCIEX8 slot is populated, the PCIEX16 slot will operate at up to x8 mode.
3. 3 x PCI Express x1 slots
   (All PCI Express slots conform to PCI Express 2.0 standard.)
4. 2 x PCI slots

If you either have one GPU in the X16 slot, or get a second GPU and do SLI or CF, running them at X8 and X8, does installing a 1X card have any effect/impact? The specifications don't mention shared bandwidth for the 1X slots -- but aren't there a total of 16, which would be all used up by either the one or the two GPUs, and if so, where are the 1X slots getting their lanes?

 

[tcsenter]

If you either have one GPU in the X16 slot, or get a second GPU and do SLI or CF, running them at X8 and X8, does installing a 1X card have any effect/impact?

It shouldn't unless the specs indicate otherwise. The P67 has enough peripheral PCI-E x1 lanes via the NB and SB to support three PCI-E x1 slots independent of the x16 PEG slots.

 

[stahlhart]

It shouldn't unless the specs indicate otherwise. The P67 has enough peripheral PCI-E x1 lanes via the NB and SB to support three PCI-E x1 slots independent of the x16 PEG slots.

Great; thanks much...