That will depend on the software. PS for example, can only use 2 cores. But if you get heavily into 3D work, it may be too slow for making a living with it, as applications such as Maya can use all that are available (current versions). You can help things along though, by improving the system bottlenecks such as RAM capacity and HDD throughputs via RAID.So if we take money out of the equation (I can only just afford an 09 Quad) and just look at the machine that will meet needs for photoshop and video editing for the next 4 years, hows it look?
It will depend on the specifics. Eventually, I expect it will get fixed with a future version of OS X, but who knows when.Will this audio problem prematurely fry the CPU? I don't want to be listening to music while working with the guilt of knowing its the equivalent of feeding cigarettes to an athlete during a triathlon.
There is a solution though if you're panicked about it, by using a PCIe based audio card. Not many AFAIK, but they do exist (2 for sure).