For those wishing to see the full recommendations for P3D here is the link, the table is at the bottom of the web page.
http://www.prepar3d.com/product-overview/
Eric,
I agree with what you say regarding Windows usage, however LM do quote and recommend using 'Windows 7 64 bit and at least 4 Gb or more' over 32 bit which they quote as only using 2 Gb, therefore it must make a difference.
Hi, I am running P3d with 16 Gb RAM and have no issues with memory running out, I use the i7 2600k and an Asus HD 6950 with 1 Gb. Most settings are max with exception to Autogen and associated settings turned off as I am running Photo-realistic scenery. I do use 64 bit Windows 7 which will make a difference over the 32 bit restrictions already mentioned.