I recently swapped from 4x 2GB DIMMs @ 1600 Mhz for a single 8GB DIMM @ 1866. I did this because next month I plan on getting my second 8 GB DIMM installed @ 1866 Mhz. I run an AMD FX chip so if I want 1866 I can only run 1 or 2 DIMMs. So my question is this: after I changed the memory it stopped displaying in my hardware monitor, can anyone tell why? I have run my memory check and everything is running fine, well, even faster than before, lol. I do like to monitor my hardware as I am running my machine to make sure nothing fails. The 2GB DIMMs were Kingston HyperX Genesis 1866 modules(would not run @ 1866 w/ out crashes) the newly installed DIMM is Crucial Ballistix Sport 8 GB 1866. Thanks!