If it doesn’t work, then contact the Amazon seller for replacement, and maybe get the faster RAM just in case. The standard practice in the RAM business is to offer a lifetime warranty, so you’re covered in any case. RAM is a commodity: If it works, different RAM won’t work “better”, it may just be more reliable. I know that officially with these versions, only 8 GB is supported, but Ive read from OWC Announces Industry’s First 16 GB RAM Upgrade For Latest Apple Mac Mini Models that you can actually upgrade to 16 GB. I suggest you take the RAM you’ve already bought, install it in your mini, and see if it works. It currently has 4 GB of RAM which I want to upgrade to 16 GB. The Mac Mini aluminum unibody case contains the Intel dual-core i5 with a 3 MB shared level 3 cache for quick, smooth processing capabilities. If you suspect you might be buying a newer PC3-12800 computer in the foreseeable future (like a 2012 mini, or a 2012 MacBook Pro), then it might make sense to get the faster RAM, so you have the option of moving it to the newer computer later. Compared to its predecessor, the mid-2011 Mac Mini offers a faster processor, architecture, RAM, graphics, and improved wireless capabilities.

But the RAM scales down to the speed of the computer - the computer doesn’t speed up to the bus speed of the RAM. RAM tends to be downward-compatible faster RAM typically will scale down to a slower bus speed, as long as it’s the same type of RAM (PC2/PC3/PC4 etc.) and fits in the same socket. The RAM bus (the pipeline connecting your RAM to your CPU) is 1333 MHz faster RAM won’t make your computer any faster, because the CPU can’t talk to the RAM any faster than it’s designed to do. Id still only recommend for someone whos technical and doesnt mind experimenting as I had to disable SIP to get the patch to work. There has been a few minor graphical glitches, but overall Im very happy with the upgrade. PC3-12800 1600 MHz RAM is faster than PC3-10600 1333 MHz RAM, but that’s not relevant to your problem. Performance has been good, and both mid-2011 Mac Minis work well with MacOS Catalina.

Mac mini mid 2011 memory upgrade