pc3 10666 compatibility

[gordonboy15]

does pc3 10666 work with all of the pc3 10600 and 10660. i have a pc3 10666 but i need more than 2gigs of ram but just need to know

 

[almartin]

The 10666 should be backward compatitable with 10600 and 10660

 

[atomicgeeks]

I just found out this is not true still unclear as to what the actual difference is. I thought it referenced the speed but it appears to be something else.