I found the number on my mainboard. What do I need to look for to find a compatible one?

CN0M9KCM7220028H03BAA00 is the number I scanned. Thank you in advance for any help you can offer

3000guy

It would help to include the computer model, when requesting info... about a component.

CN0M9KCM7220028H03BAA00 is not a motherboard part number, Dell's motherboard's number are similar to this example, "MIB75R" and are usually listed on a white label attached to the motherboard.

Bev.

This is an OptiPlex 9010 motherboard for a tower system.

www.memory4less.com/m4l_itemdetail.aspx

There are other numbers on the board,  E93839 LA0531 but there are no other QR number on the mother board

It was the only label on the system.

 E93839    WITH BACKWARDS UR is an underwriters lab marking.  THE DP/N IS DELL PART NUMBER

CN-0M9KCM-72200-28H-03BA-A00

cn = china

M9KCM = optiplex 9010 motherboard

 A00  REVISION