Faster memory running at higher speeds can clearly provide better performance, but there is no clear answer as to whether you need DDR550 memory. The market itself is very limited at present with only one or two motherboards recommended as capable of running DDR550. If you own a motherboard and CPU capable of running at DDR550 (275 setting), then DDR550 is an option. Keep in mind, however, that memory can run at slower speeds, and the performance of DDR550 in the range of DDR400 to DDR550 should be weighed in your decision.