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Topic: [Solved] MSI Z87-G45 - get > 5 cards detected (Read 1150 times)

newbie
Activity: 27
Merit: 0
Solution found:  Short the 2nd and 3rd pcie 16x slot
newbie
Activity: 27
Merit: 0
I've been working with some AMD motherboards without issues, but this MSI Z87-G45 Intel motherboard is giving me issue detecting more than 5 GPU's.

Setup:

  • Motherboard:  MSI Z87-G45
  • CPU: Intel Celeron
  • Memory: 4GB
  • OS:  Linux (BAMT 1.3)
  • Risers: all 7 are 1x -> 16x risers, two are powered
  • PSU:  2x 850w
  • GPU: 6x Powercolor 7870,  1x 270x

This motherboard has 7 pcie slots.   4 1x, and 3 16x.  Using just 3x16x does not work (3 cards, only 1 is detected).  Using all 4 1x and the first 16x works (5 cards).

So all 1x slots work, only the first 16x slot works.  I tried changing PEG 1-3 to Gen1, Gen2, Gen3, and Auto (default) to no avail.  Two of the 1x slots have their risers powered (also works unpowered).  No slots are shorted since all 1x slots work.

The BIOS has a feature where you can view all detected devices, and it only shows 5 cards even when 6 are installed (card in 2nd 16x slot not detected, moving it to 3rd 16x same thing)  BAMT 1.3 shows the same (5 cards).


Cheers!   Grin
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