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I need a motherboard with a lot of PCI slots. It's better when it had more than 5 PCI slots. Because i will put 3 or 5 LAN Card ons it. Do you have suggestions? Or there are alternatives about how to put 3 or 5 LAN Cards on one computer without a lot of PCI slots?

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this really looks like a buying recommendation question blog.stackoverflow.com/2010/11/qa-is-hard-lets-go-shopping - which is offtopic here –  Journeyman Geek Apr 26 '11 at 10:59
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closed as off topic by Journeyman Geek, Sathya Apr 26 '11 at 14:38

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3 Answers

EVGA manufactures a somewhat deluxe motherboard with 7 PCIe slots. That much components on the board 'requires' it to be something called XL-ATX and is recommended to be used with a chassis with 10 expansion slots.

Also Asus and Supermicro have MBs with 7 PCIe slots.

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You could buy a server-grade LAN card with multiple ports. Intel offers various dual- and quad-port cards on a range of buses.

A server card will be more expensive than a desktop card but you get additional benefits (load balancing, on-board processors, etc.)

Don't forget to check OS driver support if going down this path.

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Industrial rack-mount backplanes with a separate CPU card (example) can have as many as 12 to 14 slots in a single chassis, but tend to be a bit more expensive.

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How about motherboards. How many maximum PCI slots do they have. –  user40773 Jun 23 '10 at 6:40
    
One of the backplanes at the link I provided offers 12 PCI slots. –  Ignacio Vazquez-Abrams Jun 23 '10 at 6:48
    
It wasn't about backplanes but motherboards. –  Jawa Jun 23 '10 at 7:58
    
@Jawa: A motherboard is just a backplane with the CPU (and associated circuitry) on-board. –  Ignacio Vazquez-Abrams Jun 23 '10 at 8:10
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