Funny thread. I shoot large format, medium format and digital. A scan is around 120 mega pixel @48 bit, with a file size of ~ 650 MB per image. All image data are stored on an external FireWire 800 HD with 3 TB (Western Digital My Book Studio). I'm using a late 2008 iMac (Intel Core Duo, 3.06 GHz) with 6 GB RAM and Mavericks. This 'old' machine is as fast as ever, I'm having no problems with the workflow. But I have abandoned NX 2.4.x, because it won't be supported with Yosemite anymore, and I don't like the Silki Pix clone NX D. So I switched to RawTherapee, which offers a lot more features and even processes the RAW/NEF without any algorithm applied (no other software can do this). RawTherapee processes almost any RAW format as well as the TIFF format.
So, when I read about these monster machines for image processing, I can't help but smile about the weirdness of the Windows OS. Oh, btw, the swap on my Mac is around zero to 1 MB, even after processing a bunch of scan files.
I know the Unix OS is far better for huge files. That's why I switched from Linux and Windows to the Mac OS. The OS and its software is far more streamlined and optimised. In short: What we need is software that's closer to machine code (like RawTherapee or LightTable - both from the *nix world). But the large software companies are kind of lousy when it comes to high performance apps. Particularly Adobe churns out bloated software.
I really wonder what tkamiya does with the unused memory on his machine