This is a Core Duo (not Core 2 Duo) mini, with an otherwise maximum configuration. When chunking through D70 raw images, there's a noticeable delay when you zoom in beyond its cached preview image, and the initial image import is chunky but tolerable. With the D3 raw files, the delays are well past tolerable, getting onto annoying.

As to file sizes, the D3 offers several choices in raw files. You can get "compressed/uncompressed" and "lossy/not lossy". And the raw sensor is 14 bits per pixel. (I'm using the "compressed/not lossy" setting.) The D70 only gives you one choice, "compressed/lossy" and it's (ostensibly) 12 bits per pixel.