Virtual-Hideout posted a review on the QNAP TS-409 Pro Turbo NAS

For my own introduction to Qnap, they have sent the TS-409 pro. It is a 4 bay NAS, with all those basics I've just mentioned. The guts of it are powered by a 500MHZ CPU, with 256MB of ram, and 8MB of flash memory for the operating system. 500 Mhz might not seem like a lot these days, but the low power usage, optimized design is more than enough when you pair it up with a custom light Linux installation.

QNAP TS-409 Pro Turbo NAS Review