A poster over at the dpreview D3-D1/D700 forum is finding that DXO Elite can't process D3x files in 32-bit:
"I just upgraded to a D3x and DXO Elite... now
"I find it can't process FX images (DX crop are OK).
"DXO is suggesting that a 64 bit OS is required "due to the size of the files",. I find this surprising. Lightroom seems to have no problem (Yes, I know DXO is probably doing a lot more manipulation of the data, but there are ways of addressing that with memory management)"
Surprises me, too. I don't have DXO, but I would think processor speed would affect processing time. Lack of memory could certainly cause something not to work at all.
I have a brain-dead 4GB laptop running Windows Vista [can't upgrade to 7] that is literally ten times slower than my desktop, but it will run Adobe CS5 Bridge, then ACR, and ultimately Photoshop CS5 on a D3x image. The OP in that dpreview thread said that DXO Elite does things that ACR can't. Well, as I said there, not if it won't run.