Quote Originally Posted by CommonTater View Post
It may not be the speed difference, it may be the timings...
I' no expert. I only upgrade memory twice in 20 years, and both times I just went the easy route and looked for the exact specs of my previous memory. But should timings matter? As far as I know with DDR3, besides the limitations of speed, the only other concern should be guaranteeing you do not get ECC modules for mother boards that support it, or the other way around.

Being that his BIOS does detect the memory correctly and he doesn't get the ominous error beeping on boot...