My desktop's biggest limitation, according to the Vista "Experience Rating" is its CPU. I believe this is accurate, as I've been experiencing repeated CPU max-out conditions.
The processor is an AMD Athlon 64 3500+ at 2.2 GHz. It seemed a pretty good processor when I built the system 3 years ago.
I'm running 8 GB of DDR2 RAM and my disk subsystem, seems OK.
I'm considering upgrading the CPU to an AMD Phenom X4 9850 Quad Core, 2.5 GHz.
My board is listed as supporting this CPU:
Now the question: Will that quad-core CPU likely reduce the CPU max-out condition?