Onboard sound doesn't define quality-you could theoretically take the
best sound card on the market & build it into a mobo, at which point it
would become onboard sound-and yet it would still be the best sound
available.
I agree Calvin, tho I'd take umbridge regarding your "old PC" comment as
I'm writing this on a P400 [grin]. Anyway, yes the quality of onboard
sound varies greatly. For example, if you go with a quality motherboard
like ASUS or AOPEN with onboard sound even a computer tech may be
perfectly happy with the sound chipset they use.
Honestly, the only onboard sound I've /ever/ found acceptable is the
chipset on my Asus A7N8X-Deluxe. 6 channel, nVidida SoundStorm enabled,
all sounds fantastic. This isn't even true of all nForce2 boards though,
as my brother's Chaintech nForce2 has a different chipset for sound that is
only 4 channel, no SoundStorm, and sounds pretty bad compared to my
TurtleBeach Santa Cruz (which replaced the onboard sound in that machine).
Even the older Asus and Epox boards I've owned (from Slot 1 through
SocketA) have relatively crappy sound compared to a decent $35 sound card.
For someone who just hears windows noises, the sound is definitely
adaquate, but for someone who listens to a lot of music and plays a lot of
games, I think something like a Santa Cruz for $40 from newegg.com is
probably the best $40 they could spend.