Tvheadend

i want a very silent (if possible fanless) backend for tvheadend that should be controlled by my windows 8 pc (i think i would use xbmc), android devices (TVHGuide) and my tv with a small barebone (i think i'll use the zotac zbox id62 + hdmi cec adapter) using openelec. now i'm asking myself what i should use as backend. i don't want to spend much money, so i thought of a raspberry pi, but is does it really have enough performance for streaming to multiple devices at the same time?