I am going to save you some time, and get straight to the point.
If you are on a Budget – get 16 GB DDR4 RAM
If you are building a home PC for compositing – get 32 GB DDR 4 RaM
If you want to build large 3D scenes, browse the web with 50 tabs open, have nuke open – get 64 GB DDR4 RAM.
There was a time when Ram was obscenly expensive and everyone I knew got the most they could afford. These days, thanks to all the competition, RAM has become fairly affordable. Always buy the newest RAM since they are more likely to be compatible with your new motherboard.
Frankly speaking, the more the better but you don’t want to spend all that money if you don’t need it.
Memory Requirement for Compositing
1080p Composites – 16 GB Minimum
4K Composites – 32 GB Minimum
6K-8K Composites – 64 GB Minimum
Of course, the more plates and elements you read in, the resolution of your plates and elements, the number of layers in your Exr sequences, the bit depth of your plates, elements and renders, and the presence of deep data will dramatically increase the amount of RAM required to process all these data.
And that is why is some studios, comper get like 300 GB of ram.
I got 64 GB of Ram and never looked back. Also my motherboard only supports up to 64GB.
Price – $783.98 (4 x 16 GB) 08 Feb 2017