Motherboard with 6+ PCI slots

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BlueFox

Legendary Member Spam Hunter Extraordinaire
Oct 26, 2015
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Lots available from Supermicro in the X9 and X10 generations that has 7 PCIe slots. The X9DRH and X10DRH lines for example.
 

zer0sum

Well-Known Member
Mar 8, 2013
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The X10SRL-F is another great option, and is single CPU, but it really depends on your exact requirements :)

7 PCI-E slots total:
  • 2 x PCI-E 3.0 x8
  • 2 x PCI-E 3.0 x8 (in x16)
  • 2 x PCI-E 3.0 x4 (in x8)
  • 1 x PCI-E 2.0 x4 (in x8)