Is there a problem with AM3 based motherboards and being able to use memory faster than 1333? Looking at building a system for someone with a M4A87TD EVO and they want either 8GB or 16GB of memory on board. Just wondering if I use a AMD X4 or X6 if I will be restricted to 1333 memory speed as the upper limit.
I haven't used that board, but, no, you aren't restricted, since it seems it also supports faster RAM if you o/c it.
Since you o/c it, then the probability of your board being stable goes a bit down.
I doubt you would notice the difference in faster memory, in anything but benchmarks, unless you are using very demanding programs.
For 16+GB RAM, it is also best to go with ECC RAM, and make sure it is supported via their memory QVL. (All this assumes that, that board supports ECC)