Dell R610 with 6.7

Hello

I have two Dell R610 servers that works well with 6.5.  I'm looking to upgrade to 6.7 on one but the CPU is not supported.  Is it possible to replace the motherboard in a R610 with one that supports the 6.7 CPU's?  I ask this since I think it may be cheaper to go this route that purchase another server.  I know this may be a Dell forum question but since this is a popular server someone may have an idea.

Thanks