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Is there a key to the suffixes used in Supermicro mainboard part numbers? For example, Newegg sells a X10SL7-F-O but Supermicro's site only lists a X10SL7-F.

JDługosz
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X10SL7-F-O is the retail package with box.

X10SL7-F-B is the bulk package.

-O vs -B model numbers​

Many people get confused with these model numbers when they can only find an X10SL7-F-O, instead of an X10SL7-F, or an X10SLM+-F-B instead of an X10SLM+-F. All model numbers are exactly as printed in their respective sections. For real products, they get either an -O or a -B appended to them, for retail or bulk packaging, respectively. An example: A Supermicro X10SL7-F-O is a retail-packaged X10SL7-F motherboard. A Supermicro X10SL7-F-B is a bulk-packaged X10SL7-F motherboard.

What's the difference between them? With retail packaging, you get a box, with proper packaging materials. With bulk packaging, you get something along the lines of an antistatic bag, a bit of protective foam and some cardboard to wrap it all up.