HI, i just order the new 27" iMac. I do a lot of video editing and upgraded to
the following configuration:
3.4GHz Quad-core Intel Core i7, Turbo Boost up to 3.9GHz
8GB 1600MHz DDR3 SDRAM - 2x4GB
3TB Fusion Drive
NVIDIA GeForce GTX 680MX 2GB GDDR5
I didn't want to pay the extra 500 bones for the 32 g of Ram through he apple store. I'm wondering if there is a specific type or brand of 32GB 1600MHz DDR3 SDRAM - 4x8GB that i should order. or if 32 is over kill?
I would examine the info in Activity Monitor when you are working to see if you need more memory.
About OS X Memory Management and Usage
Understanding top output in the Terminal
The amount of available RAM for applications is the sum of Free RAM and Inactive RAM. This will change as applications are opened and closed or change from active to inactive status. The Swap figure represents an estimate of the total amount of swap space required for VM if used, but does not necessarily indicate the actual size of the existing swap file. If you are really in need of more RAM that would be indicated by how frequently the system uses VM. If you open the Terminal and run the top command at the prompt you will find information reported on Pageins () and Pageouts (). Pageouts () is the important figure. If the value in the parentheses is 0 (zero) then OS X is not making instantaneous use of VM which means you have adequate physical RAM for the system with the applications you have loaded. If the figure in parentheses is running positive and your hard drive is constantly being used (thrashing) then you need more physical RAM.
Adding RAM only makes it possible to run more programs concurrently. It doesn't speed up the computer nor make games run faster. What it can do is prevent the system from having to use disk-based VM when it runs out of RAM because you are trying to run too many applications concurrently or using applications that are extremely RAM dependent. It will improve the performance of applications that run mostly in RAM or when loading programs.
You can purchase memory upgrade kits at OWC specifically for your model.