Found this not sure if it will help
IMPORTANT: The memory types "F", "R", and "P" are NOT COMPATIBLE WITH MOST DESKTOP MOTHERBOARDS. Most desktop motherboards are only compatible with unbuffered memory. "E" is compatible but the ECC function will be bypassed.
How do you identify the memory type? The label for the memory type specifies the features. It's designated by the last letter(if there is one). For example, in the label "PC2-5300F" the last character "F" designates the memory as fully buffered. Additionally, "R" and "P" designates the memory as registered, "E" designates the memory as ECC unbuffered, and "U" designates it as unbuffered. The lack of a letter designates it as unbuffered.
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