Sure,
but a HTPC that (in my case) is solely designed to be a Media Center and will never be used for gaming whatsoever wouldn't need the performance provided by an i5, but would immensely profit from the integrated graphics of the i3.
A little cost comparison:
- AMD Athlon II X2 245 2.9 GHz (65 Watt): € 42,-
- AMD Phenom II X6 1055T 2.8 GHz (125 Watt): € 150,-
- i3 540 3.06 GHz (72 Watt): € 95,-
- i5 650 3.20 GHz (73 Watt): € 150,-
- i7 870 2.93 GHz (95 Watt): € 239,-
Since the Intel CPUs need more Power I would have needed a bigger power-supply, that would have produced more warmth, so I would have needed faster (means: louder) cage-fans as well.
The mainboards for socket 1156 cost about € 30,- more for the same equipment