I see a Sapphire HD 3870, is that what you mean?
Yes it is a typo , it should be 3870 not 3879.
I did modify the first post to rectify this correction
Regardless, you aren't getting audio because DVI doesn't carry audio, so converting from DVI to HDMI won't give you audio.
I see, then if I need to get audio via HDMI cable t , I need to buy VGA card that has HDMI port built it ,,,Isn't it ?