Well dusting of the fans might help
You can also try and use tiewraps to put the cables together
Sometimes "rounded cables" instead of flat might cut down the blocking of the airflow
The soundcard mostly don't get hot, but if you're GFX card doesn't have the "breathing space" it might get hot.. My card (Radeon 9800 Pro) doesn't have space at all (all my PCI slots are full) and is running around 50°C (normal temperature I guess)
You can check with the program called "CPU-Z" (
http://www.cpuid.org/download/cpu-z-129.zip) , but I think (99,9% sure) that you have a Prescott build, because Northwood's Max Ghz is 3.06 GHz (if i'm right).
The Intel Stockfan looks like this: