Big Price Drop on 8GB Memory Modules
A hefty price drop just occurred on 8GB memory modules at OWC (see review). There is still a premium for 8GB modules over 4GB modules, but the price per GB is now much closer.
The OWC 8GB modules have been running flawlessly for two months now— highly recommended.
In the quad-core Mac Pro Nehalem (see review), the four slots accepts four modules, maxing-out at 32GB of memory. But unless you really need 32GB, 24GB is better idea, since triple channel memory is fastest. I use 24GB in my 3.33Ghz Mac Pro.
For my 8-core 2.93GHz Mac Pro Nehalem, I use 48GB (six 8GB modules), which is also optimal (triple channel memory, 3 channels for each CPU).