The K series I had it was fanless, my DS-7608NI-I2 / 8P has 2 fans - I replaced the standard 40x40x10mm case side fan with a quiet 12DB fan. The power supply fan is a bit trickier, not to remove, but to find something quiet enough, as it's a 40x40x20mm fan running at 8200RPM and 30DB, and most...