Fusion drive question

http://www.macworld.com/article/2014011/how-to-make-your-own-fusion-drive.html

 

Not everything you read from the fusion drive will come from the SSD, therefore the 7200 RPOM dribe will help fror rads from the HD por4tion of the Fusion Drive. Also if you're doing a lot of writing to the FD at one time, you will wind up writing firectly to the HD.

In short, the 7200 RPM drive is a better idea unless there is a possible heat issue. The 2012 and 2013 21.5" iMacs may have a heat issue with 7200 RPM drives since they were designed around 5400 RPM drives.

 

Don't get fixated on "5400rpm" vs. "7200rpm". Hard drives get slower as they fill up, so an almost full 1TB drive will be slower than a 1/3rd full 3TB drive, no matter what the rpm.

 

There's something else to consider as well.

If you leave the two drives "un-fused", you will get faster operation out of the SSD, particularly if you have a lot of files, particularly larger ones. Remember that one of the functions of "CORE storage" is that less-frequently-accessed files get shuffled around from SSD to HDD, etc.

Of course, you will have to "manually manage" what goes where on the two individual drives.

For some folks, this is a problem.
For me, no problem at all.