This is where I was trying to lead this: people aren't comparing apples to apples and are just throwing out anecdotal hyperbole.
OK - I've thrown together a list of options.
1. i7 cpu/mobo/8gb memory, no video upgrade ($550?)
2. AMD 6 core/mobo/8gb memory, new video card ($600)
3. New video card, new CPU chiller - overclock the shit out of it (Cheap)
I'm tempted to try #3 first.
This is why I cannot recommend Option 2 with AMD's current state unless you can use the 6 core usefully in some other way.
Ouch - I knew there was a performance hit, I didn't know there was that much of a delta.
Uh nope, I just realised I'm arguing with someone who thinks a q6600 is still a viable processor even though the i5/i7 are out. I'll agree to disagree.
Here is my opinion and experience:
I upgraded from a q6600 to an i7. I noticed far better performance in everything. If you don't believe me, that's kewl.
I did some more testing, turns out prior to Cata with5 clients running my cores would hover in the 70-80% range all the time.
After cata they're pegged at 100% all the time - I think it's the extra video rendering overhead that comes with cata.
When I raid with my guild (1 client) I turn up the grafx to Ultra and don't have an issue. It's definitely a processor issue.
Next paycheck, new board/cpu/memory will be on the way - I doubt I'll have to do anything with my video configuration.
Thanks for all the input.
To put some closure to this, I upgraded the cpu/mobo/memory yesterday. I went to a i7 2600k, 8gb 1333mhz memory on a new asus mobo - Will be upgrading to 16gb next check.
Same video cards, same hard drives.
Single client framerates fluctuate between 150-200 in Orgrimmar with 1 client running. With all 5 it caps out, 60fps on the primary window with video effects 2 steps up from the minimum, and 30fps with video effects 1 step up from minimum.
CPU utilization hovers around 20-30% at all times - it absolutely positively was the CPU. Thanks for all the input.