What have been some of your guys favorite computer upgrades over the years??

I feel really lucky lately since I recently learned of an app called PrimoCache and it's really speed up my workflow doing VMs and such. I caches my disk access in RAM so that files are read back at the speed of the RAM 20GB/s instead of the speed of my SSD which is only 400MB/s.

I also recently bought some 2 port 10G fiber network cards online for $35 USD a piece and that's made accessing my home server blazing fast.