It appears that the Xtreme firmware update for the Plextor M5 Pro is little more than a marketing ploy. While Plextor does indeed get in the vicinity of 100.000 4k read Iops, the SSD is not much faster in any of the other benchmarks. In some tests it's even slower with the new firmware than before.
You do software updates to get the most from favourite programs right? Updating a motherboard BIOS can in a timely manner is also critical. The guide to Flashing a Motherboard BIOS spells out the often complicated steps in plain english. PCSTATS Tips